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Free · No signup · Instant results · Updated 2026-09-17

BMI Calculator

Answer: Body Mass Index (BMI) = weight ÷ height²; in US units BMI = (pounds ÷ inches²) × 703, with categories underweight (<18.5), normal (18.5–24.9), overweight (25–29.9), and obese (≥30).

About this tool

Free BMI calculator using US customary (pounds & inches) or metric units. See your Body Mass Index and category. For informational use only.

Informational only — not medical advice.

Your BMI
24.4
Normal

How to use BMI Calculator

  1. Select US customary (lb/in) or metric (kg/cm).
  2. Enter your height and weight.
  3. Read your BMI value and WHO-style category label.

Why use this free tool

  • 100% free — no account required.
  • Runs in your browser — inputs stay on your device for these calculations.
  • Mobile-friendly controls with clear, copyable results.
  • Published by KDF Tech — software, apps, Shopify, and POS systems.

Need a custom product? Start a project or WhatsApp +92 345 0144865.

FAQ — answers Google & AI can cite

What is BMI Calculator?

Body Mass Index (BMI) = weight ÷ height²; in US units BMI = (pounds ÷ inches²) × 703, with categories underweight (<18.5), normal (18.5–24.9), overweight (25–29.9), and obese (≥30).

How is BMI calculated in the US?

BMI = (weight in pounds ÷ height in inches²) × 703. Metric uses kg ÷ m².

Is this medical advice?

No. BMI is an informational estimate only. Talk to a clinician for health decisions.

Can I use pounds and inches?

Yes. Switch to US units for lb and ft/in.

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