Fitness and Health Calculators

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

Fitness Calculators

Body Mass Index from height and weight (metric).

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

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

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

Estimate BMR and daily calorie needs by activity level.

Compare popular ideal body weight formulas by height and sex.

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

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

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

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

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

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

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

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

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

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

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

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