Free Health & Fitness Calculators That Respect Your Privacy
Welcome to Calculator Converter Tool. This is a small, focused library of free health and fitness calculators — BMI, BMR, TDEE, body fat, calorie and protein needs, step and walking calories, sleep timing, heart-rate zones, height conversion and gym strength converters. Every tool works instantly in your browser. There is no account, no app, no newsletter wall, and the numbers you type never leave your device.
Each page is written for people first: plain language, the actual formula, a worked example, honest limitations, and answers to the questions people really ask. The calculators use standard, widely accepted formulas and are checked against known values before publication. Pick a category below to get started.
Weight & Body Composition
BMI Calculator
Use the free BMI calculator to check your Body Mass Index in seconds. Metric or imperial, instant category result, private and mobile-friendly, with the formula and 36 FAQs.
Body Fat Calculator
Estimate your body fat percentage free with the US Navy circumference method. Metric or imperial, instant result with healthy ranges and 36 FAQs. Private, no sign-up.
Ideal Weight Calculator
Estimate a healthy target weight for your height with this free ideal weight calculator. Uses BMI and target range, metric or imperial, with clear guidance and FAQs.
Waist-to-Hip Ratio Calculator
Calculate your waist-to-hip ratio free. A simple health-risk indicator based on waist and hip measurements, with WHO ranges and guidance. Instant and private.
Waist-to-Height Ratio Calculator
Calculate your waist-to-height ratio free. A simple 'keep your waist below half your height' health check with risk categories. Instant and private.
Female Body Type Calculator
Estimate your body shape (apple, pear, hourglass, rectangle) from bust, waist and hip measurements with this free female body type calculator. Private and instant.
Lean Body Mass Calculator
Calculate lean body mass (LBM) free with the Boer formula. Estimate fat-free mass, fat mass and body fat from height and weight. Instant and private.
Body Adiposity Index Calculator
Estimate body fat percentage from hip circumference and height using the Body Adiposity Index. Free BAI calculator, no scale needed. Instant and private.
Weight Loss Goal Calculator
Plan healthy weight loss with this free goal calculator. Estimate a realistic target date and daily calorie target based on your current and goal weight. Instant and private.
Frame Size Calculator
Estimate small, medium or large body frame from wrist circumference and height. A quick, free bone-structure guide for interpreting healthy weight.
Body Shape Index (ABSI)
Calculate A Body Shape Index from height, weight and waist. A free ABSI calculator combining BMI and waist for health risk context.
Waist Circumference
Check whether your waist falls in a healthy range using sex-specific action levels for cardiometabolic risk.
Relative Fat Mass (RFM)
Estimate body fat percentage from height and waist using the RFM formula. A simple tape-measure method.
Body Roundness Index
Calculate BRI from height and waist as an alternative body-shape and health-risk measure.
Ponderal Index
Calculate the Ponderal Index (kg/m³), a height-cubed leanness ratio related to BMI.
BMI Prime
See your BMI as a ratio of the healthy upper limit for an instant relative reading. Free and simple.
Body Fat Category
See what a body fat percentage means with men's and women's athletic, fitness and average ranges.
Amputee Weight & BMI
Estimate whole-body weight and an adjusted BMI after amputation using segment percentages.
Fracture Risk
A simplified 10-year fracture-risk estimate from age, BMI, family history and smoking. Not FRAX®.
BMI for Older Adults
Calculate BMI with context for adults 65+, including the older-adult healthy range.
Healthy Weight Range
Find a healthy weight range for your height using BMI 18.5–24.9.
Body Fat from BMI
Estimate body fat percentage from BMI, age and sex using the Deurenberg formula.
BMI Percentile
Get an approximate adult BMI percentile and the standard weight category.
Body Recomposition
Estimate lean mass, protein and a mild deficit for building muscle while losing fat.
Ideal Body Weight (Devine)
Estimate ideal body weight by height using the clinical Devine formula.
Adjusted Body Weight
Estimate adjusted body weight (IBW + 40% of excess) used in clinical contexts.
Goal Weight by Body Fat
Estimate goal weight at a desired body-fat percentage assuming lean mass is preserved.
Katch-McArdle BMR
Calculate BMR from lean body mass using the Katch-McArdle formula.
FFMI (Fat-Free Mass Index)
Calculate Fat-Free Mass Index from weight, body fat and height as a muscularity estimate.
Protein by Goal Weight
Set a daily protein target from goal weight and whether you build or cut.
Skinfold Body Fat
Estimate body fat from three skinfold sites with the Jackson-Pollock and Siri equations.
Bulk Calories
Set daily calories for lean or aggressive muscle-building above maintenance.
Calories Per KG
Quickly estimate BMR and TDEE per kilogram of body weight.
Creatine Dose
Estimate a creatine monohydrate loading or steady daily dose.
Race Time Predictor
Predict a race time from a recent performance using the Riegel formula.
Boer Lean Mass
Estimate lean body mass with the Boer formula from height, weight and sex.
Athlete BMI
Calculate BMI with a reminder that muscle can make BMI misleading.
1-RM Percentage
Estimate a weight for a number of reps as a percentage of your one-rep max.
Serving Calories
Convert calories per 100 g to calories per serving using serving size.
Height Converter
Convert height between centimetres and feet/inches instantly.
Simple BMR
A quick BMR estimate using the 24 kcal/kg rule.
Target Weight
Estimate weight at a desired body-fat percentage.
Ideal Waist
Suggest a healthy waist size from the waist-to-height idea.
Body Adiposity Index
Estimate BAI from height and hip circumference.
Hamwi Ideal Weight
Estimate ideal body weight with the Hamwi formula.
Robinson Ideal Weight
Estimate ideal weight with the Robinson formula.
Pre-Pregnancy BMI
Calculate BMI from pre-pregnancy weight and height.
Weight Change
Calculate percentage weight change between two weights.
Grip Strength
See a general category for handgrip strength by sex.
Calories, Metabolism & Nutrition
BMR Calculator
Free BMR calculator using the Mifflin-St Jeor equation. Estimate your basal metabolic rate and daily calories burned at rest, in metric or imperial, instantly and privately.
BMR Calculator (Lean Body Mass)
Estimate BMR from lean body mass with the Katch-McArdle formula. Free lean-mass BMR calculator for more accurate resting calories when body fat is known. Private and instant.
BMR Calculator for Children
Estimate a child's basal metabolic rate with a paediatric, age-appropriate formula. Free BMR calculator for children and teens, with guidance and limits. Instant and private.
TDEE Calculator
Calculate your TDEE free. Estimate total daily energy expenditure from BMR and activity level to plan maintenance, fat loss or muscle gain. Instant and private.
Maintenance Calories Calculator
Find your maintenance calories with this free calculator. Estimate the daily intake that keeps your weight steady, based on BMR and activity. Instant, private, metric/imperial.
Calorie Needs Calculator
Free calorie needs calculator estimates how many calories you should eat per day to lose, maintain or gain weight, based on BMR and activity. Instant, private and metric/imperial.
Protein Needs Calculator
Estimate your daily protein needs free based on body weight, goal and activity. Grams per day for muscle gain, fat loss or maintenance. Instant and private.
Water Intake Calculator
Estimate your daily water intake in litres and glasses based on weight and activity. Free hydration calculator with practical guidance. Instant and private.
36-Hour Fast Calculator
Plan a 36-hour fast with this free calculator. Get start/end times, fasting windows and safety guidance. Instant and private, with evidence-based notes.
Macro Calculator
Split daily calories into protein, carbs and fat for cutting, maintenance, bulking or keto. Free macronutrient planner in grams.
Sodium Intake Calculator
Compare daily sodium against recommended limits and convert sodium to grams of salt. Free sodium tracker for blood-pressure health.
Fiber Intake Calculator
Estimate your daily fibre target in grams from calorie intake using the 14 g per 1000 kcal guideline. Free and instant.
Child Calorie Calculator
Estimate daily energy needs for children 3–18 from age, size and activity using IOM-style equations.
Sleep Calories
Estimate calories burned while sleeping from body weight and hours using a 0.95 MET factor.
Calcium Intake
See daily calcium targets by life stage with food-source and vitamin D notes.
Weight Loss Date
Calculate the daily calorie target to reach a goal weight by your chosen date.
Carb Intake
Set a daily carbohydrate target in grams from calories and a preferred carb percentage.
Resting Calories
Estimate calories burned at rest (BMR) with the Mifflin-St Jeor equation.
Active Calories
Estimate TDEE and daily activity calories from BMR and an activity factor.
Daily Value (%)
Calculate the % Daily Value of a nutrient for a serving using label reference values.
Pregnancy Calories
Estimate extra calories in the second and third trimesters.
Breastfeeding Calories
Estimate extra calories used making breastmilk from milk volume.
Harris-Benedict BMR
Calculate basal energy expenditure with the Harris-Benedict equation.
Potassium Intake
See an approximate daily potassium target by profile.
Magnesium Intake
Estimate a daily magnesium target from sex and age.
Vitamin C Intake
See a daily vitamin C target by life stage.
Vitamin B12 Intake
See daily B12 targets by life stage with food-source notes.
Formula Scoop
Estimate formula powder and scoops for a bottle from water and concentration.
Paediatric Fluid
Estimate a child's maintenance fluid using the Holliday-Segar method.
NEAT Calories
Estimate extra calories burned through non-exercise activity like steps.
Dehydration
Estimate a fluid deficit from weight and a dehydration percentage.
Transfusion Volume
Estimate packed red-cell volume from weight and desired Hb rise.
Paediatric Dose
Calculate a total mg dose from a mg/kg recommendation and weight.
Sodium Converter
Convert sodium mg to mmol and to grams of salt.
Protein Per KG
Set a daily protein target from goal weight and g/kg.
Alcohol Units
Convert drink volume and ABV to grams and UK units.
Daily Caffeine
Add up caffeine from coffee, tea and energy drinks.
Calories Per 100g
Convert calories per serving to per 100 grams.
Fibre Goal
Estimate a daily fibre target from calorie intake.
Carb-to-Fibre Ratio
Compare total carbohydrate to fibre in a food.
Heart, Vitals & Clinical
Blood Pressure Calculator
Check what your blood pressure reading means with this free calculator. Systolic and diastolic categories with pulse pressure. Educational only, not a diagnosis.
Heart Age Calculator
Estimate your heart age based on blood pressure, smoking, diabetes and BMI. A free, educational cardiovascular risk calculator. Not a diagnosis — see your doctor.
Heart Rate Reserve (HRR) Calculator
Calculate your heart rate reserve and target training zones with this free HRR calculator. Uses resting and maximum heart rate for accurate cardio zones. Instant and private.
eGFR Kidney Function Calculator
Estimate estimated glomerular filtration rate (eGFR) with the CKD-EPI formula. Free kidney function calculator from age, sex and creatinine. For education, not diagnosis.
Body Surface Area Calculator
Estimate body surface area (BSA) in m² with the Du Bois formula. Free BSA calculator used for medication dosing and health assessment. Instant and private.
Blood Alcohol Content Calculator
Estimate blood alcohol content (BAC %) with the Widmark formula. Free, private BAC calculator for educational use. Never drink and drive.
LDL Cholesterol Calculator
Estimate LDL ("bad" cholesterol) with the Friedewald formula from total, HDL and triglycerides. Free lipid panel helper.
Cardiovascular Risk Calculator
Estimate 10-year heart risk from age, blood pressure, cholesterol and smoking. Free educational heart-risk tool.
Maximum Heart Rate Calculator
Estimate max heart rate using 220 minus age, Tanaka, Gellish and Oakland formulas. Free MHR for training zones.
HbA1c Calculator
Convert HbA1c percentage to average blood glucose (eAG) in mg/dL and mmol/L using the ADA formula. Free and private.
Insulin-to-Carb Ratio Calculator
Estimate a starting insulin-to-carb ratio and correction factor using the 500 and 1800 rules. Educational only.
Heart Rate Zones
Calculate five training zones as percentages of your age-estimated max heart rate for cardio planning.
Oxygen Saturation (SpO2)
Interpret a pulse oximeter reading with normal, low and urgent ranges and safety guidance.
Respiratory Rate
Check a breathing rate against typical ranges for adults, children and infants. Educational only.
Gait Speed
Calculate walking speed in m/s and mph from distance and time as a simple mobility marker.
Fitness Age
Estimate a rough "fitness age" from age, resting heart rate and weekly activity.
Blood Type Compatibility
See which donor blood types a recipient can receive for red-cell transfusion. Educational guide.
Recovery Heart Rate
Check the one-minute heart-rate drop after exercise as a fitness-recovery marker.
Rh Factor Compatibility
Check possible Rh incompatibility between parents for pregnancy. Educational guide.
Uric Acid
Interpret a uric acid level for men and women with typical ranges and gout-risk context.
FIB-4 Liver Fibrosis
Estimate liver fibrosis risk from age, AST, ALT and platelets. Educational only.
Corrected QT (QTc)
Correct a QT interval for heart rate using Bazett's formula. ECG education only.
Creatinine Clearance
Estimate CrCl with the Cockcroft-Gault equation from age, weight and creatinine.
Mean Arterial Pressure
Calculate MAP from systolic and diastolic blood pressure.
Pulse Pressure
Calculate pulse pressure (systolic minus diastolic) and its general meaning.
Altitude Oxygen
Get a rough sea-level-equivalent SpO2 for a reading taken at altitude.
Bone Density T-Score
Interpret a DEXA T-score as normal, osteopenia or osteoporosis.
FEV1/FVC
Calculate the spirometry FEV1/FVC ratio and its general meaning.
Anemia (Hemoglobin)
Interpret a hemoglobin level for men, women and pregnancy.
Glasgow Coma Scale
Add eye, verbal and motor responses into a GCS score (educational).
CHA2DS2-VASc
Estimate an AF stroke-risk score to discuss with a clinician.
Wells DVT
Estimate a simplified Wells score for DVT likelihood.
qSOFA
Add the three quick SOFA criteria as a sepsis screen (educational).
MELD-Na
Estimate MELD and MELD-Na liver scores from lab values.
PERC
Check the eight PERC criteria for pulmonary embolism rule-out.
HAS-BLED
Estimate a simplified bleeding-risk score for anticoagulation.
CURB-65
Estimate a pneumonia severity score from five clinical features.
Corrected Sodium
Correct sodium for high blood glucose with the standard formula.
Anion Gap
Calculate the serum anion gap from sodium, chloride and bicarbonate.
Cycling Power
Estimate cycling power and W/kg from weight, speed and gradient.
YMCA Cycle
Estimate aerobic fitness from a simplified submaximal cycle test.
HbA1c to eAG
Convert HbA1c percentage to estimated average glucose in mg/dL and mmol/L.
BUN:Creatinine
Calculate the BUN-to-creatinine ratio from two lab values.
INR Range
Compare an INR with common therapeutic ranges for anticoagulation.
HbA1c Units
Convert HbA1c between DCCT percentage and IFCC mmol/mol.
Blood Pressure Average
Average multiple home BP readings and see the category.
LDL Cholesterol
Estimate LDL with the Friedewald equation.
eGFR (CKD-EPI)
Estimate kidney function with the CKD-EPI equation.
Shock Index
Calculate heart rate divided by systolic blood pressure.
Activity, Steps & Cardio
Steps to Calories Calculator
Convert steps to calories with this free calculator. Estimate calories burned walking based on step count, height and sex. Instant, private, metric/imperial.
Steps to Miles Calculator
Convert steps to miles free with this calculator. Estimate walking or running distance from step count and height, with a reverse option. Instant and private.
Steps to Kilometers Calculator
Convert steps to kilometres free with this metric calculator. Estimate walking distance from step count and height, plus reverse km-to-steps. Instant and private.
Walking Calorie Calculator
Estimate calories burned walking with this free calculator. Enter weight, pace and duration to see calories burned for any walk. Instant, private and accurate.
StairMaster Calorie Calculator
Estimate calories burned on a StairMaster or stair climber with this free calculator. Enter weight, level and duration for an instant, private result.
Push-Up Calorie Calculator
Estimate calories burned doing push-ups with this free calculator. Enter your weight, reps or minutes and intensity for an instant, private result.
VO2 Max Calculator
Estimate your VO2 max from a 12-minute walk/run using the Cooper formula. Free cardio fitness calculator with age and sex ratings. Instant and private.
Sleep Calculator
Find the best bedtime or wake-up time with this free sleep calculator. Plan sleep in 90-minute cycles so you wake between cycles, feeling rested. Instant and private.
Calories Burned Calculator
Estimate calories burned for walking, running, cycling, swimming and more using MET values and your weight. Free and instant.
Running Pace Calculator
Calculate pace per km and per mile, plus speed in km/h, from any distance and time. Free run, walk or split tool.
Sweat Rate Calculator
Estimate your hourly sweat and fluid loss during exercise from before/after weight. Free hydration planner for athletes.
One-Rep Max Calculator
Estimate your 1RM with Epley, Brzycki and Lombardi formulas from a weight and reps. Free strength-planning tool.
Caffeine Half-Life Calculator
See how much caffeine remains in your body over time and when it clears. Free coffee/energy-drink timing tool.
Alcohol Units Calculator
Convert beer, wine and spirits into alcohol units, grams and calories. Free drink-tracking and health-awareness tool.
Rep Max Calculator
Find the weight to lift for a target number of reps from your one-rep max, using Epley percentages.
Resting Heart Rate
See what your resting pulse suggests about general fitness and recovery. Educational only.
Sleep Debt Calculator
Estimate weekly sleep deficit and how many recovery nights you need to repay it.
Ankle-Brachial Index
Calculate ABI from ankle and arm pressures as an educational PAD screening estimate.
Daily Steps
Categorise your step count and estimate the distance covered. A simple activity guide.
Running Speed
Convert a running pace (min/km) into speed in km/h and mph instantly.
Running Cadence
Estimate stride length and speed from height and steps per minute.
Steps to Calories
Convert steps to estimated distance and calories from height, weight and pace.
Rockport Walk
Estimate VO2 max from a one-mile walk time, heart rate, age and weight.
Cooper 12-Min Run
Estimate VO2 max from distance covered in a 12-minute run.
Training Paces
Estimate easy, tempo and interval paces from a recent race time.
Training Load (ACWR)
Compare this week's training load with the four-week average to spot spikes.
Stride Length
Estimate running stride length from height and cadence, plus speed.
Exercise Hydration
Estimate fluid and sodium to replace during exercise from sweat rate.
Elevation Calories
Estimate extra calories burned climbing elevation gain by weight.
Ovulation Test Timing
Estimate the best days to use ovulation tests around your cycle.
Cadence to Pace
Convert cadence and stride length into running speed and pace.
Steps to KM
Convert steps to kilometres and miles using stride length.
Steps to Miles
Convert a step count to miles using stride length.
Mile Pace
Convert a one-mile time to pace per km and speed.
Sleep Cycles Bedtime
Work backward from a wake time to whole-cycle bedtimes.
Height, Growth & Measurement
Height Converter
Convert height between centimetres, feet and inches instantly with this free height converter. Accurate, private and mobile-friendly. No sign-up required.
Height Comparison Calculator
Compare two heights in cm or feet/inches with this free height comparison calculator. See the exact difference instantly, privately, on any device.
Child Height Percentile Calculator
Estimate a child's height percentile and predicted adult height with this free child height calculator. Uses parent heights and growth-chart logic. Instant, private.
BMI Calculator for Children and Teens
Free BMI calculator for children and teens aged 2–19. Estimates BMI-for-age percentile and weight category. Educational only; consult a paediatrician.
Foot Length to Height Ratio Calculator
Estimate height from foot length, or foot length from height, with this free ratio calculator. Based on anthropometric ratios, instant and private.
Pregnancy Due Date Calculator
Estimate your baby's due date from the first day of your last period. Free pregnancy due date calculator with gestational age. Educational only.
Age Calculator
Free age calculator that finds your exact age in years, months, days, hours and minutes from your date of birth. Also calculates age on any date or a target birth year. Instant and private.
Pregnancy Weight Gain Calculator
Estimate healthy pregnancy weight gain by pre-pregnancy BMI and week using IOM ranges. Free and educational.
Baby Weight Percentile
Estimate where a baby's weight falls for age and sex with a simplified growth-percentile model. Educational only.
Baby Length Percentile
Estimate where an infant's length falls for age and sex using a simple growth-curve model. Educational only.
Mid-Parental Height
Predict a child's adult height from parents' heights using the mid-parental method.
Newborn Weight Loss
Calculate percentage weight change after birth with context.
Fertile Day
See an illustrative conception chance by day around ovulation.
Temperature Converter
Convert body temperature between Celsius and Fahrenheit with fever context.
Weight Converter
Convert weight between kilograms, pounds and stones.
Blood, Heart & Metabolic Health
Cholesterol Ratio Calculator
Calculate your total-to-HDL cholesterol ratio and understand its heart-health meaning. Free lipid panel helper.
Blood Pressure Converter
Convert blood pressure between mmHg and kPa instantly. Free unit converter for systolic and diastolic readings.
Fasting Glucose Calculator
Interpret a fasting blood sugar in mg/dL and mmol/L with normal, prediabetes and diabetes ranges.
Diabetes Risk Calculator
Estimate type 2 diabetes risk from age, waist, family history and activity. Educational screener, not a diagnosis.
Target Heart Rate Calculator
Find your exercise target heart rate using the Karvonen method. Free training-zone calculator.
Blood Donation Eligibility
Check basic donation criteria including age, weight, haemoglobin and interval. Guidance only; the blood service decides.
Blood Volume Calculator
Estimate total blood volume, plasma and red-cell volume in litres using the Nadler formula. Free educational tool.
Smoking Cost Calculator
See what smoking costs daily, monthly and yearly and how much quitting saves. Free motivation and budgeting tool.
Pack-Years Calculator
Calculate lifetime smoking exposure in pack-years from cigarettes per day and years smoked. Free history tool.
Women's Health & Pregnancy
Ovulation Calculator
Estimate your ovulation date and fertile window from your last period and cycle length. Free fertility calculator, not contraception.
Pregnancy Due Date Calculator
Estimate your baby's due date from the first day of your last period. Free due date and gestational-age tool.
Period Calculator
Predict your next period, fertile window and ovulation from your last cycle. Free menstrual tracker, educational only.
Pregnancy Test Date
Find the earliest and most reliable dates to take a home pregnancy test after ovulation. Free when-to-test guide.
Due Date by Conception
Estimate a due date as 266 days from conception or IVF, with trimester milestones. Free pregnancy calculator.
Baby Milk Intake
Estimate daily formula or breastmilk volume from a baby's weight and feeds per day. Educational guide only.
Conception Date
Estimate when conception likely occurred by counting back 266 days from a due date.
Pregnancy Trimester
Find which trimester a number of pregnancy weeks falls in and weeks remaining. Simple guide.
Blood Type Calculator
Predict possible child ABO blood types from the parents' types with a simple Punnett model. Educational only.
Apgar Score
Understand how the five Apgar signs combine into a newborn 0–10 score. Educational tool for parents.
Implantation Date
Estimate the 6–12 day implantation window after ovulation for early-pregnancy context.
hCG Doubling
Project expected hCG rise between beta tests using 48- and 72-hour doubling.
IVF Due Date
Estimate an IVF/FET due date from embryo transfer date and embryo age.
Pregnancy Weeks to Months
Convert pregnancy weeks to months and see the current trimester.
Postpartum Weight
See weight remaining above pre-pregnancy after birth with gentle context.
Baby Sleep
See recommended total sleep, including naps, by age from infants to teens.
Weeks Until Due
Count weeks and days to a due date with simple pregnancy context.
Kick Count
Record how long ten fetal movements take with simple guidance.
Fertility by Age
See an illustrative monthly conception chance by age for context.
Pregnancy Caffeine
Compare daily caffeine with the commonly cited 200 mg limit.
Cycle Variability
Calculate average cycle length and regularity from several cycles.
Baby Feeding Interval
See an approximate feeding interval by baby age.
Ultrasound Due Date
Estimate a due date from an ultrasound and gestational age.
Baby Age in Weeks
Calculate a baby's age in weeks and days from birth.
Pregnancy Gain Remaining
Estimate remaining pregnancy weight gain by BMI.
Nutrition & Hydration Targets
Fat Intake Calculator
Estimate daily fat grams from your calories and eating approach, with a saturated-fat guideline. Free macro tool.
Sugar Intake Calculator
Estimate a daily added-sugar limit in grams and teaspoons from your calories using WHO guidance. Free and private.
Iron Intake Calculator
Estimate daily iron needs by sex and life stage, with food sources and absorption tips. Educational only.
Vitamin D Sunlight Calculator
Rough guide to midday sun exposure for vitamin D by skin tone, with skin-safety notes. Educational only.
Calorie Deficit Calculator
Turn your TDEE and desired weekly loss into a daily calorie target. Free sustainable-fat-loss tool.
Total Body Water Calculator
Estimate total body water in litres and as a percentage of weight using the Watson formula. Free educational tool.
Sleep Cycle Calculator
Find bedtimes that complete whole 90-minute sleep cycles before waking. Free optimal bedtime planner.
Keto Calculator
Set ketogenic macros with personal protein, high fat and a 5% net-carb target from your calories.
Katch-McArdle BMR
Calculate BMR from lean body mass with the Katch-McArdle formula for more personalised results.
Calories Per KM
Estimate calories burned per kilometre walking, jogging, running or cycling based on body weight.
Cholesterol Converter
Convert cholesterol between mg/dL and mmol/L using the standard 38.67 factor.
Triglyceride Converter
Convert triglycerides between mg/dL and mmol/L with the correct 88.57 factor.
Glucose Converter
Convert blood glucose between mg/dL and mmol/L using the factor of 18. For diabetes tracking.
Exercise Time to Burn
Estimate minutes of walking, running or cycling needed to burn a number of calories.
Corrected Calcium
Adjust total calcium for low albumin using the standard correction formula.
Glycemic Load
Calculate glycemic load of a serving from carbs and glycemic index.
Gym & Strength Converters
Dumbbell and Barbell Bench Press Converter
Convert between dumbbell and barbell bench press weights with this free converter. Estimate equivalent loads for balanced training. Instant, private, metric/imperial.
Leg Press to Squat Converter
Convert leg press weight to an estimated squat weight with this free converter. Compares machine and free-weight loads for training planning. Instant and private.
Squat to Leg Press Converter
Convert your squat weight to an estimated leg press load with this free converter. Plan machine leg work from your free-weight squat. Instant and private.
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Frequently Asked Questions
Are all the calculators really free?
Yes. Every calculator is completely free with no trials, subscriptions or hidden charges.
Do I need to create an account?
No. There is no login and no registration. Open any page, enter your values and calculate.
Are the results private?
Completely. All the math runs in your browser; nothing you enter is sent to or stored on a server.
Can I use these on my phone?
Yes — the site is fully responsive and works on any modern phone, tablet or computer.
Are these calculators a substitute for medical advice?
No. They are educational and planning tools. For personal health decisions, consult a qualified professional.
Why We Built These Calculators This Way
Most calculator sites bury a simple answer under ads, pop-ups and account prompts. We did the opposite. Calculator Converter Tool keeps each tool fast, private and easy to read, with the formula shown so you can trust the result. Whether you are managing your weight, planning training, tracking activity or just curious, you will get a clear answer in seconds — and your data stays yours.