A BMI number on its own — "24.1" — doesn't tell you what to do. The free BMI calculator now answers the follow-up questions most calculators skip: what's a healthy weight for my height, what's my ideal weight, how much do I need to lose or gain, and is BMI even the right metric for me?
Your healthy weight range and ideal weight
A healthy BMI is 18.5–24.9, which maps to a specific weight range for your height. Instead of leaving you to do the algebra, the calculator shows:
- Your healthy weight range (in kg, pounds, or stone)
- A target weight at BMI 22 — the middle of the healthy band
- Exactly how much to lose or gain to get into range
So "24.1, Normal" becomes "you're in the healthy range" — or "lose about 6 lb to reach it."
A visual gauge, not just a number
The result sits on a colored scale (underweight → normal → overweight → obese) with a marker showing exactly where you land and how close you are to the next band. Much easier to read than a bare figure.
Metric, imperial — and stone
You can enter weight in kg, pounds, or stone (the common UK format of stone + pounds), and height in cm or feet/inches. The BMI is identical across units; only the inputs change. Your healthy range comes back in whichever unit you chose.
Why BMI alone can mislead — and what to add
BMI compares weight to height, but it can't tell muscle from fat. For a muscular build it often overstates body fat. That's why the tool now includes a Waist-to-Hip Ratio (WHR) tab:
- Enter your waist and hip measurements (cm or inches)
- Get your ratio plus the WHO health-risk band for your sex (elevated above 0.85 for women, 0.90 for men)
WHR reflects where you carry fat, which research links more directly to heart-health risk — a useful second opinion when BMI looks off.
How to use it
- Open the free BMI calculator
- Pick metric, imperial, or stone, and enter height and weight
- Read your BMI, gauge, healthy range, and ideal weight
- Switch to the Waist-to-Hip Ratio tab for fat-distribution risk
Everything runs in your browser — nothing is uploaded or stored.
Related Tools
- free calorie and TDEE calculator with macros — turn your BMI goal into a daily calorie target for losing, maintaining, or gaining weight
- convert kg to lbs and cm to inches free — switch body measurements between metric and imperial in a tap
- free loan EMI calculator with amortization — another free, no-signup calculator from the same toolkit
See your healthy range, ideal weight, and waist-to-hip ratio with the free BMI calculator →
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