Calculator
BMI Calculator
Calculate your Body Mass Index with metric or imperial units and a visual BMI scale.
Disclaimer: BMI is a screening tool, not a diagnostic measure. It does not account for muscle mass, bone density, age, sex, or body composition. Consult a healthcare professional for personalized health advice.
🔒 All calculations happen in your browser. Your health data is never sent anywhere.
☕ Love this tool? Support the developer.
100% free — no ads, no limits. Your support keeps every tool free.
Secure payment via Stripe · No account needed
About BMI Calculator
OptiPix BMI Calculator computes your Body Mass Index from your height and weight. Switch between metric (kg/cm) and imperial (lb/ft+in) units. The result shows your BMI value, category (Underweight, Normal, Overweight, or Obese), and a color-coded visual scale showing where you fall on the BMI spectrum from 15 to 40+. See your healthy weight range based on your height. All calculations use the standard BMI formula (weight in kg / height in meters squared) and run entirely in your browser. Important: BMI is a screening tool, not a diagnostic measure — consult a healthcare professional for health advice.
How It Works
The calculator applies the standard BMI formula: weight in kilograms divided by the square of height in meters. For imperial inputs, it first converts pounds to kilograms (÷ 2.205) and feet/inches to meters. The visual scale maps the BMI value to a position on a color-coded gradient bar.
Use Cases
- •Quick health screening for general fitness awareness
- •Track BMI changes over time during a fitness program
- •Determine healthy weight range for your height
- •Educational reference for health and nutrition courses
- •Pre-consultation BMI check before doctor visits
Frequently Asked Questions
How is BMI calculated?
What are the BMI categories?
Is BMI an accurate measure of health?
Can I use imperial units?
Is my health data sent to any server?
Related Tools
Age Calculator
Calculate your exact age in years, months, days, weeks, and hours from your date of birth.
Unit Converter
Convert between 100+ units across length, weight, temperature, area, volume, speed, data, time, pressure, and energy.
Percentage Calculator
Calculate percentages: what is X% of Y, X is what % of Y, percentage change, add/subtract percentages.
Tip Calculator
Calculate tips, split bills, and compare tip percentages at a glance.