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

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

Waist-to-Height & Waist-to-Hip Ratio Calculator helps you measure WHtR and WHR, understand body fat distribution, and view easy results fast.

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

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.

Convert mmol/L to mg/dL (or mg/dL to mmol/L) instantly using molar mass. Includes glucose presets + custom molecules. Live, accurate, simple.

Blood type calculator to estimate a child’s possible ABO and Rh blood types from the mother’s and father’s blood types.