BMI & Fitness Calculator
Calculate your BMI, BMR, TDEE, ideal weight range, and body fat percentage. Track your fitness metrics with an interactive gauge.
How It Works
Understand your body metrics in minutes
Enter Your Data
Weight, height, age, and gender. Add waist/neck/hip for body fat. Toggle metric/imperial.
See Your Metrics
BMI gauge, category badge, BMR, TDEE, ideal weight range, body fat %, and calorie goals.
Set Your Goal
Use the calorie goal calculator to see how many calories for weight loss, maintenance, or gain.
Frequently Asked Questions
BMI is calculated by dividing your weight in kilograms by your height in meters squared (kg/m²). For imperial units, use (weight in lbs × 703) ÷ height in inches².
Basal Metabolic Rate (BMR) is the calories your body needs at complete rest. It uses the Mifflin-St Jeor formula: for men, 10×W(kg) + 6.25×H(cm) − 5×Age + 5; for women, 10×W(kg) + 6.25×H(cm) − 5×Age − 161.
Total Daily Energy Expenditure (TDEE) is your BMR multiplied by your activity level. It estimates your total daily calorie burn, helping you set calorie goals for weight loss, maintenance, or gain.
Body fat is estimated using the US Navy circumference method, which has an accuracy of about ±3%. For a more precise measurement, consider DEXA scans or hydrostatic weighing.
No, this tool is for informational purposes only and is not medical advice. Always consult a healthcare professional before starting any diet or exercise program.