Health Calculators
Health and fitness calculators
Fitness
Weight Loss CalculatorFitnessEstimate the daily calories to lose weight from your BMR and activity, with a target pace or date, safe-rate checks, and a macro breakdown.
Protein CalculatorFitnessFind how much protein to eat each day. Set a target in grams from your weight, activity, and goal, split it across meals, and see the healthy range for your size, with an optional lean-body-mass mode.
Pace CalculatorFitnessCalculate running pace, time or distance from any two, with speed, pace in min/km and min/mile, and predicted finish times for 5K, 10K, half and full marathon.
Metabolic Rate CalculatorFitnessFind your basal metabolic rate (BMR) from weight, height, age, and sex using the Mifflin-St Jeor, Harris-Benedict, or Katch-McArdle equation, with your total daily energy expenditure and a per-hour, watts, and per-week rate breakdown.
Maintenance Calorie CalculatorFitnessFind your daily maintenance calories (TDEE) from weight, height, age, sex, and activity using the Mifflin-St Jeor, Harris-Benedict, or Katch-McArdle equation, with calorie-goal and macro options.
Macro CalculatorFitnessFind your daily protein, carb, and fat targets in grams. Estimates your calories from BMR and activity, adjusts for your goal, and splits them by diet plan.
Height Percentile CalculatorFitnessSee where your height ranks. Enter your height, sex, and country to get your percentile, or enter a percentile to find the height that reaches it.
Cardiac Output CalculatorFitnessCalculate cardiac output from heart rate and stroke volume, then add cardiac index, ejection fraction, and an oxygen-based Fick estimate.
Calories Burned CalculatorFitnessEstimate the calories burned by any activity from its duration, by a walk, run or ride from its distance, by a session from its average heart rate, or backwards from a calorie target. Shows gross and net calories, the MET applied, and what a hill or a carried load adds.
Calorie Intake CalculatorFitnessWork out how many calories to eat a day, by five published methods at once: Mifflin-St Jeor, revised Harris-Benedict, Katch-McArdle, the IOM DRI EER and Schofield. Maintain, lose or gain, with a zigzag cycling plan and the answer in kilojoules.
Calorie Deficit CalculatorFitnessFind the calories to eat to lose weight. Estimate your maintenance calories (TDEE) from weight, height, age, sex, and activity, subtract a chosen deficit, and see your weekly loss and time to a goal weight.
Caffeine CalculatorFitnessAdd up a day's caffeine and compare it with the limit for your body weight and life stage, see how much is still in you at bedtime, and work out the latest you can have one more cup. Built on first-order half-life kinetics with adjustable metabolism.
Burpee Calorie CalculatorFitnessWork out the calories burned doing burpees from reps, from minutes, from a calorie target, or from a round-based interval session. Shows gross and net calories, calories per rep and per minute, and what the burn is worth.
Bruce Protocol METs CalculatorFitnessTurn your Bruce protocol treadmill time into VO2 max, MET max, maximum and 85 percent heart rates, the stage you reached, and an ACSM fitness band for your age and sex, with the extra treadmill time the next band would take.
Breastfeeding Calorie CalculatorFitnessWork out how many calories you need a day while breastfeeding. Add the energy your milk costs to your own maintenance needs, by feeding stage or by measured milk output, and get a safe weight-loss target that protects your supply.
Body Water CalculatorFitnessEstimate the total volume of water in your body from your height, weight, age and sex using the Watson, Hume-Weyers and mL per kilogram methods, with the compartment breakdown and your normal range.
Body Surface Area CalculatorFitnessEstimate body surface area (BSA) from height and weight using the Du Bois, Mosteller, Haycock, Gehan-George, Boyd, Fujimoto, Takahira, and Schlich formulas, and compare all eight side by side.
Body Shape CalculatorFitnessFind your body shape from your bust, waist, and hip measurements using the seven-category FFIT system, and see your waist-to-hip ratio, what your shape means, and the styles that suit it.
Body Frame Size CalculatorFitnessFind your body frame size (small, medium, or large) from your wrist circumference or elbow breadth and height, for women and men.
Body Fat Percentage CalculatorFitnessFind your body fat percentage from tape measurements or BMI, or enter a number you already know, then see your category, fat and lean mass, FFMI, and your ideal body fat for your age.
Body Fat CalculatorFitnessEstimate your body fat percentage with the U.S. Navy, BMI, or RFM method, see your category, fat and lean mass, FFMI, and a goal weight.
BMI CalculatorFitnessCalculate your Body Mass Index from your weight and height, see your weight category and a healthy weight range, plus BMI Prime and the Ponderal index.
Blood Donor CalculatorFitnessEstimate your total blood volume from sex, height, and weight, then see donation eligibility, the safe amount per session, donation frequency, and your lifetime impact.
Blood Donation Due Date CalculatorFitnessFind your next eligible blood donation date. Enter your last donation date and the type you gave (whole blood, Power Red, platelets or plasma), and this calculator adds the standard recovery interval to show when you can donate again, with a countdown and how many times a year you can give.
Birth Weight Percentile CalculatorFitnessFind a newborn's birth weight percentile and z-score by gestational age and sex using the INTERGROWTH-21st growth standard, with SGA/AGA/LGA classification and a percentile growth chart.
Birth Control Cost CalculatorFitnessEstimate and compare the real cost of birth control methods. See the yearly, monthly, first-year, and total cost of the pill, IUD, implant, shot, and more, with insurance coverage and effectiveness.
Bike Size CalculatorFitnessFind your recommended bike frame size from your height and inseam for road, mountain, hybrid and kids' bikes, plus saddle height and standover clearance.
Bench Press Pyramid CalculatorFitnessPlan a bench press pyramid from your one-rep max. Pick ascending, descending, full, or full reverse, choose your sets, and get the load, reps, and intensity for each set.
Bench Press CalculatorFitnessEstimate your bench press one-rep max from any set, solve for the weight or reps for a target, compare seven formulas, see training percentages, and rate your bench against your bodyweight.
Benadryl Dosage Calculator for DogsFitnessWork out a weight-based Benadryl (diphenhydramine) dose for your dog in mg and in tablets or liquid, with the dosing interval, the safe daily maximum, and canine safety warnings.
Benadryl Dosage CalculatorFitnessWork out a weight-based Benadryl (diphenhydramine) dose in mg and in liquid, chewables, tablets, or capsules, with the dosing interval and safe daily limit.
BBT Calculator (Basal Body Temperature)FitnessAdjust a basal body temperature reading taken off-schedule back to your usual measurement time, flag unreliable readings, and compare against your coverline.
Barthel Index CalculatorFitnessScore the ten Barthel Index activities of daily living, get the 0 to 100 total and its dependency band, and compare a later reading to track functional recovery.
BAI Calculator (Body Adiposity Index)FitnessEstimate your body fat percentage from hip circumference and height with the Body Adiposity Index, classify it by age and sex, and compare it against BMI.
Blood Alcohol Content (BAC) CalculatorFitnessEstimate your blood alcohol content from your sex, weight, drinks, and time using the Widmark equation, with your impairment level, the driving limit, and how long until you are sober.
Baby's Milk Intake CalculatorFitnessEstimate how much breast milk or formula your baby needs per day and per feeding, based on age band and weight, with an age-based ml/kg chart and feeding guidance.
Baby Growth Percentile CalculatorFitnessFind your baby's weight, length or height, and head circumference percentiles by age and sex using the LMS method behind the CDC and WHO growth charts, plus weight-for-length and z-scores.
Baby Formula CalculatorFitnessEstimate how much infant formula to feed your baby per day and per feeding, based on age and weight, with a feeding schedule, prep planner, and cost.
Baby Age CalculatorFitnessFind your baby's exact age from their date of birth in weeks and days, months, and days. Shows the pediatric stage, the date of the next monthly milestone and birthday, and the corrected (adjusted) age for premature babies.
Army Body Fat CalculatorFitnessEstimate your body fat with the 2023 Army one-site tape test and see whether it meets the Army maximum for your age and sex, with fat mass, lean mass, and the fat to lose to reach the standard.
Ape Index CalculatorFitnessWork out your ape index from your height and arm span, as both a ratio and a signed difference, with an interpretation for climbing, swimming, boxing, and basketball.
Alcohol Units CalculatorFitnessWork out the alcohol units in any drink from its size and ABV, or add up a typical week against the UK 14-unit low-risk guideline, with grams of pure alcohol and calories.
Alcohol By Volume (ABV) CalculatorFitnessFind the ABV of your homebrew from original and final gravity, or count the standard drinks and grams of pure alcohol in any drink from its ABV and size.
Army Fitness Test (AFT) CalculatorFitnessScore all five Army Fitness Test events by age and standard, see your total out of 500, and check your pass or fail status before test day.
Adjusted Body Weight CalculatorFitnessCalculate adjusted body weight from ideal and actual weight, with a choice of ideal-weight formula and adjustment factor, plus BMI, body surface area, and lean body weight.
6 Minute Walk Test CalculatorFitnessFind the predicted six-minute walk distance and the lower limit of normal from sex, age, height, and weight, and compare a measured walk as a percent of predicted.