Health & Fitness
Free health and fitness calculators for BMI, ideal weight, body fat, BMR, calories and running pace. See the formula, and what each result cannot tell you.
46 calculators
Calories & nutrition
BMR CalculatorBasal metabolic rate from the Mifflin-St Jeor equation.Calorie CalculatorDaily calories for your goal, activity level and body stats.Calories Burned CalculatorCalories burned by activity, duration and body weight.Protein CalculatorDaily protein target from body weight and training load.BAC CalculatorBlood alcohol content from drinks, weight and time.Keto CalculatorMacro split for a ketogenic diet from your calorie target.RMR CalculatorResting metabolic rate, the calories you burn at rest.TDEE CalculatorTotal daily energy expenditure from BMR and activity.Water Intake CalculatorDaily water target from weight, activity and climate.Carbohydrate CalculatorCarb grams from your calorie share or your training load.Fat Intake CalculatorFat grams from your calorie target, with the saturated cap.Macro CalculatorProtein, fat and carb grams, split across your meals.Maintenance Calorie CalculatorCalories to hold your goal weight, and the gap from today.
Weight & body fat
BMI CalculatorBody mass index with WHO category bands, in metric or imperial.Body Fat CalculatorBody fat percentage from skinfold caliper measurements.Lean Body Mass CalculatorLean body mass and fat mass from body fat percentage.Weight Loss CalculatorCalorie deficit and time to reach a target weight.Body Shape CalculatorBody shape from bust, waist and hip measurements.Ideal Weight CalculatorHealthy weight range from BMI, Devine, Robinson and Miller formulas.Pregnancy Weight Gain CalculatorRecommended weight gain range by week of pregnancy.BAI CalculatorBody adiposity index from hip circumference and height.BMI Calculator for WomenBMI plus the healthy weight range at your height, in kg.Fat CalculatorBody fat percentage estimated from BMI, age and sex.FFMI CalculatorFat-free mass index from weight and body fat percentage.Healthy Weight CalculatorHealthy weight range for your height, and the distance to it.Navy Body Fat CalculatorBody fat from neck, waist and hip measurements.Weight Gain CalculatorCalories and timeline to gain a target amount of weight.Weight Loss Percentage CalculatorWeight lost as a percentage of your starting weight.
Health metrics & scores
Target Heart Rate CalculatorTraining heart rate zones from age and resting pulse.Body Surface Area CalculatorBody surface area by Du Bois, Mosteller and Haycock.IQ Percentile CalculatorIQ to percentile and the rarity of a score.Child Height Percentile CalculatorA child's height percentile for age and sex.Child Weight Percentile CalculatorA child's weight percentile for age and sex.CRC Risk CalculatorColorectal cancer risk from age, history and lifestyle.Free Water Deficit CalculatorFree water deficit and the fluid needed to correct it.Sobriety CalculatorTime sober, and the money and calories saved.
Fitness & performance
Cycle & sleep
Pregnancy & fertility
Conception CalculatorWork back from a due date to the day you most likely conceived.Due Date CalculatorEstimated due date from your last period, with the four term stages around it.Ovulation CalculatorOvulation day, the fertile window and your next period.Pregnancy CalculatorWeeks pregnant, trimester and the milestones ahead.
Other categories
Every calculator on CalcMax, grouped by what you are trying to work out.
MathPercentages, fractions, geometry, algebra and number bases.FinanceLoans, mortgages, interest, tax and investment returns.PhysicsMotion, forces, electricity, thermodynamics and optics.StatisticsAverages, standard deviation, probability and grade curves.Date & TimeAge, date differences, durations, time zones and conversions.ConstructionConcrete, gravel, mulch, paint, tile and square footage.BiologyGenetics, populations, microbiology and animal dosing.SportsPace, splits, running and cycling performance metrics.ChemistryMolarity, dilutions, reactions and stoichiometry.Food & CookingRecipe scaling, baking ratios, cooking conversions.ElectronicsOhm's law, resistors, wire gauge, batteries and signals.AutomotiveFuel cost, gas mileage and trip planning.OtherBra sizing and random password generation.