Fitness and Health Calculators

BMI, calories, heart rate zones, and wellness metrics.

Fitness Calculators

BMI Calculator

Body Mass Index from height and weight (metric).

Calorie Calculator

Estimate daily calories to maintain, lose, or gain weight.

Calories Burned Calculator

Estimate calories burned by duration or by distance for walking, running, and cycling.

Body Fat Calculator

Estimate body fat % with U.S. Navy and BMI methods.

BMR Calculator

Estimate BMR and daily calorie needs by activity level.

Ideal Weight Calculator

Compare popular ideal body weight formulas by height and sex.

Healthy Weight Calculator

Body-weight range for BMI 18.5–25 from height (adults).

Pace Calculator

Estimate pace, time, distance, and projected finish time.

Army Body Fat Calculator

Estimate Army-style body-fat screening and compare with age standards.

Lean Body Mass Calculator

Estimate lean body mass with Boer, James, Hume, and Peters formulas.

One Rep Max Calculator

Estimate 1RM from submaximal sets with Epley, Brzycki, or Lombardi—tables and chart included.

Target Heart Rate Calculator

Karvonen zones from age and optional resting HR, plus Haskell, Tanaka, or Nes max-HR formulas.

Pregnancy Calculator

Due date, week-by-week schedule, trimesters, milestones, and progress—like classic pregnancy tools.

Pregnancy Weight Gain Calculator

IOM-style recommended gain by pre-pregnancy BMI, shaded week chart, and full week-by-week table.

Pregnancy Conception Calculator

Most probable and possible conception and intercourse windows from due date, LMP, or ultrasound.

Due Date Calculator

EDD from last period, ultrasound, conception date, or IVF transfer (day 3 / 5 / 6 embryo).

Ovulation Calculator

Ovulation window, fertile days, next periods, and projected due date—plus a 6-cycle table.

Conception Calculator

Most probable conception days, ovulation window, best intercourse timing, test date, next period, due date—calendar + 6 cycles.

Period Calculator

Three-month calendar with period vs ovulation days, navigation, and six-cycle date table.

Macro Calculator

Daily calories and macro ranges with tabbed styles: Balanced, Low Fat, Low Carb, High Protein, and Custom.

Carbohydrate Calculator

Estimate daily carbohydrate grams from calorie targets with a goal table at 40%, 55%, 65%, and 75%.

Protein Calculator

Estimate daily protein grams using weight-based and calorie-percent recommendation ranges.

Fat Intake Calculator

Estimate daily total fat range (20-35%) and saturated-fat ceilings (10% and 7%) across maintenance, loss, and gain calories.

TDEE Calculator

Estimate maintenance calories (TDEE), BMI context, and practical calorie targets for loss or gain.

GFR Calculator

Estimate adult and pediatric eGFR from serum creatinine with multiple comparison formulas.

Body Type Calculator

Classify body shape from bust, waist, high-hip, and hip measures, with waist-hip ratio (WHR).

Body Surface Area Calculator

Estimate body surface area using multiple formulas and compare outputs in m2, ft2, and in2.

BAC Calculator

Estimate blood alcohol concentration (BAC), time to 0%, and impairment status from drinking inputs.