Health & Fitness Tools
BMI, BMR, daily calories, ideal weight and body fat — instantly.
Understand your body with evidence-based health tools. Calculate your BMI and where it falls on the standard ranges, estimate your basal metabolic rate, work out your daily calorie needs for any goal, and check your ideal weight range and body fat percentage.
All tools
BMI Calculator
Calculate your Body Mass Index and healthy weight range.
BMR Calculator
Calculate your Basal Metabolic Rate with the Mifflin-St Jeor equation.
Daily Calorie Calculator
Calculate the calories you need to maintain, lose or gain weight.
Ideal Weight Calculator
Find your ideal weight range using four medical formulas.
Body Fat Calculator
Estimate body fat percentage with the U.S. Navy method.
5 tools · updated continuously
How these tools work
Understand your body with evidence-based health tools. Calculate your BMI and where it falls on the standard ranges, estimate your basal metabolic rate, work out your daily calorie needs for any goal, and check your ideal weight range and body fat percentage. Every tool in this category publishes its formula, worked example and assumptions so you can verify the result yourself.
Frequently asked questions
Are these health tools medical advice?
No. They are informational estimates based on standard formulas. Consult a healthcare professional for medical guidance.
What is a healthy BMI range?
For adults, 18.5–24.9 is generally considered a healthy range, with under 18.5 underweight and 25+ overweight.
How accurate are calorie estimates?
They use the Mifflin-St Jeor equation, which is among the most accurate general formulas. Real needs vary with body composition and activity.