Calculate BMR using the Mifflin-St Jeor equation. Get your daily calorie needs based on age, height, weight, and sex.

Estimate calories to gain weight safely. Set your goal rate and get daily surplus calories and weekly gain estimates.

Calculate waist-to-hip and waist-to-height ratios. Check health risk ranges with quick measurements and results.

Convert mcg to IU (and IU to mcg) for common vitamins. Choose vitamin type for accurate unit conversion.

Calculate maintenance calories (TDEE) from BMR and activity. Know how many calories to maintain your current weight.

Use the Harris-Benedict equation to calculate BMR and estimate daily calories (TDEE) based on activity level.

Calculate your daily calories (TDEE) with US goals like lose 1 lb/week or gain 0.5 lb/week. See weekly change and targets instantly.

Estimate your conception date, due date, and gestational age using due date or LMP with this free conception date calculator.

Predict your next period start/end, ovulation day, and fertile window from LMP and cycle length with this free period calculator.