Fitness & Health Calculators

Body Mass Index from height and weight, with your category clearly shown.

WHO thinness scale for BMI below the healthy range, with support resources included.

BMI category above the healthy range — Overweight through Obese Class III — with context.

Daily calorie needs for maintaining, losing, or gaining weight.

Estimated body fat percentage using the U.S. Navy circumference method.

Calories burned at rest using the Mifflin-St Jeor and Harris-Benedict formulas.

A healthy weight range for your height using several established formulas.

Running pace, finish time, or distance for any race or training run.

Body fat percentage using the official Army circumference-based standard.

Total weight minus fat mass — useful for setting cutting and bulking targets.

Check whether your current weight sits inside a healthy range for your height.

Calories burned during an activity based on type, duration, and body weight.

Estimated single-rep max for any lift from a sub-maximal weight and rep count.

Safe training heart rate zones by age and goal — fat burn, cardio, or peak.

Due date, current week, and key milestones from your last period or conception date.

Expected delivery date using Naegele's rule from your last period, conception, or IVF transfer.

Estimated conception date worked backward from a known due date or last period.

Your likely conception window based on cycle length and last period start date.

Recommended weight gain by trimester based on pre-pregnancy BMI.

Fertile window and likely ovulation date from average cycle length.

Predicted period dates for the next 12 months based on your cycle history.

Daily protein, carbs, and fat targets built around your weight-management goal.

Total daily energy expenditure — the foundation number for any diet plan.

Daily protein target based on body weight, goal, and activity range.

Daily carb intake built around your calorie goal and macro split.

Recommended daily fat intake in grams and as a share of total calories.

Estimated blood alcohol content using the Widmark formula, and sober time.

Log a full drinking session and see estimated BAC rise and fall on a timeline.

An independent points-style estimate from a food's calories, fat, sugar, and protein.

Estimated glomerular filtration rate for kidney function using the CKD-EPI equation.

Find your body shape — hourglass, pear, apple, rectangle, or inverted triangle — from your measurements.

BSA using the Mosteller, DuBois, and Haycock formulas, used in clinical dosing.