The BMI calculator that actually explains your number.
Instant, accurate Body Mass Index with healthy range, category, and what to do next. Built for clarity, not ads.
- ✓ 100% client-side — your data never leaves your browser
- ✓ Metric & imperial with instant toggle
- ✓ Healthy weight range + category guidance
Quick BMI check
Get your number in 5 seconds — no signup.
Healthy weight range for your height
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All our calculators
One for every body and life stage — all free, all private.
Adult BMI Calculator
The standard WHO BMI calculation with healthy range and category.
→BMI for Women
BMI tailored with female-specific ranges and body composition context.
→BMI for Men
BMI for adult men with muscle-mass notes and healthy range.
→Child & Teen BMI
Age- and sex-specific BMI percentile for kids and teens.
→Senior BMI
Adjusted healthy range for adults 65+.
→Asian BMI
WHO-aligned thresholds for Asian populations.
→Athlete BMI
BMI with muscle-mass context for athletic builds.
→Ideal Weight
Find your healthy weight using 5 evidence-based formulas.
→Body Fat %
Estimate body fat from BMI, age, and sex.
→Waist-to-Hip Ratio
Cardiometabolic risk from waist and hip measurements.
→Waist-to-Height Ratio
Single 0.5 cutoff across populations.
→BMI Prime
BMI / 25 — quick relative-to-healthy score.
→Body Surface Area
Mosteller formula for chemo dosing, cardiac index.
→BMR
Mifflin-St Jeor resting energy expenditure.
→TDEE
Total daily calories with activity factor.
→Macro Split
Convert calorie target to grams of protein/carbs/fat.
→Calorie Deficit
Plan a safe weight-loss deficit and timeline.
→Lean Body Mass
Estimate fat-free mass via the Boer equation.
→Ponderal Index
Cube-based alternative to BMI (Rohrer).
→Why Helthvibe?
Most BMI tools are ad-heavy, opaque, or ignore limitations. We do the opposite.
Privacy-first
All calculations run in your browser. No server, no tracking of your height or weight.
Honest context
BMI is a useful signal but not the full picture. We tell you when it falls short.
Fast & clean
Astro-powered. Sub-second load. No popups, no autoplay, no dark patterns.
Built with East Coasters in mind
Free BMI tools for NYC, Brooklyn, DC, and Northern Virginia.