BMI Calculator

Calculate your Body Mass Index and understand your weight category

What is BMI?

Body Mass Index (BMI) is a simple measure of body fat based on your height and weight. While it doesn't directly measure body fat percentage, it's a useful screening tool for identifying potential weight-related health issues.

BMI Categories

  • Underweight: BMI less than 18.5
  • Normal weight: BMI 18.5 to 24.9
  • Overweight: BMI 25 to 29.9
  • Obese: BMI 30 or higher

Limitations of BMI

BMI has limitations and may not accurately reflect body composition for:

  • Athletes and bodybuilders (muscle weighs more than fat)
  • Elderly individuals (may underestimate fat)
  • Different ethnic groups (risk levels may vary)

For a more complete picture, track additional body measurements like waist circumference, body fat percentage, and muscle measurements with The Tracker App.

Frequently Asked Questions

Is BMI an accurate measure of health?

BMI is a screening tool, not a diagnostic one. It doesn't account for muscle mass, bone density, or fat distribution. Athletes often have "overweight" BMIs despite being very healthy. Use BMI alongside other metrics like body measurements and body fat percentage.

How can I track my body measurements?

The Tracker App lets you log body measurements via SMS, iMessage, or Telegram. Track chest, arms, waist, hips, thighs, and more with simple text commands.

What's a healthy rate of weight change?

For sustainable results, aim for 0.5-1 lb per week for weight loss and 0.25-0.5 lb per week for muscle gain. Rapid changes are often unsustainable and may include muscle loss.

Should I focus on weight or body measurements?

Both! Weight gives you a quick snapshot, but body measurements show where changes are happening. Someone gaining muscle while losing fat might see little scale change but significant measurement changes.