BMI Calculator

Calculate your Body Mass Index instantly with metric or imperial units. Get insights into your weight category and understand your health metrics. Fast, accurate, and private.

Healthy RangeBMI 18.5 - 24.9 = Normal
Example70kg / 1.75m² = BMI 22.9
Quick CheckWeight ÷ Height² = BMI

The Bottom Line

This BMI calculator provides instant, accurate Body Mass Index calculations using either metric (kilograms and centimeters) or imperial (pounds, feet, and inches) measurements. Calculate your BMI in seconds and understand which health category you fall into—underweight, normal weight, overweight, or obese—based on WHO standards. The tool works entirely in your browser with complete privacy, requires no registration, and gives you immediate feedback with health category explanations. Perfect for tracking fitness progress, health assessments, or quick BMI checks before doctor appointments.

Important Notice

Do not use this tool as a definitive health indicator. Always consult your doctor before making health related decisions. All The Tools is not a healthcare provider and is not qualified to give health advice.

Calculate BMI (Imperial)

lbs
Height
ft
in
Your BMI
Enter values above

BMI Categories

Underweight
BMI < 18.5
Normal weight
BMI 18.5 - 24.9
Overweight
BMI 25 - 29.9
Obese
BMI ≥ 30

BMI is a screening tool. Consult a healthcare professional for personalized health advice.

Understanding BMI

Quick Calculation

Instantly calculate BMI from height and weight

Dual Units

Switch between metric and imperial measurements

Category Reference

View standard BMI ranges and categories

Easy Tracking

Simple tool for personal record keeping

Problems This BMI Calculator Solves

  • Eliminates manual BMI calculations - No need to remember formulas or pull out a calculator. Get instant results by simply entering your weight and height.
  • Removes unit conversion hassle - Forget about converting pounds to kilograms or feet to centimeters. Choose your preferred unit system and calculate directly.
  • Provides immediate health categorization - No more wondering what your BMI number means. Get instant feedback on whether you're underweight, normal weight, overweight, or obese based on WHO standards.
  • Saves time during health assessments - Perfect for quick checks before doctor appointments, fitness consultations, or health insurance applications where BMI is required.
  • Ensures privacy and security - All calculations happen in your browser. No data is stored, transmitted, or shared. Your health information stays completely private.
  • Works offline once loaded - No internet required after the page loads. Calculate your BMI anywhere, anytime without connectivity concerns.
  • Eliminates confusion between measurement systems - Whether you're in the US using imperial units or anywhere else using metric, you get accurate BMI calculations without conversion errors.
  • Provides context with explanations - Don't just get a number—understand what it means with category-specific health guidance and recommendations.