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BMI Calculator: metric vs imperial — both work

Kilograms-to-pounds, centimeters-to-inches: how BMI Calculator handles both unit systems, plus the tiny rounding gotchas to watch for.

Tool:BMI Calculator

ℹ️ For informational use only. This page describes how to use a calculator and how to read its result — it does not constitute medical, legal, or financial advice. For decisions that materially affect your health, finances, or legal situation, consult a qualified professional.

Most people use a BMI Calculator once a year — and forget the formula between uses. The good news: you don't need to remember it. The tool runs the math; this guide explains what's happening so you can read the result correctly.

Launch the tool: BMI Calculator — Everything happens locally in your browser — your file never leaves your device.

How BMI Calculator handles units

BMI Calculator accepts both metric and imperial inputs and internally converts everything to a common base. So whether you enter 70 kg or 154 lb, the resulting calculation is identical. There's no "metric mode" — both work side by side.

Quick conversion reference

If you need to convert mentally before pasting into BMI Calculator:

  • Kilograms ↔ pounds: 1 kg ≈ 2.2 lb
  • Centimeters ↔ inches: 1 in = 2.54 cm exactly
  • Meters ↔ feet: 1 m ≈ 3.28 ft
  • Liters ↔ US gallons: 1 gal ≈ 3.79 L

Launch the tool

BMI Calculator →

No upload, no signup, no daily limit.

Frequently asked questions

Is BMI Calculator accurate?

Yes — it implements the standard, published formula. The numerical output matches what any reputable reference calculator would produce.

Is BMI Calculator suitable for professional use?

For quick reference and screening, yes. For binding decisions (medical, legal, financial), BMI Calculator's result should be cross-checked with the relevant professional source.

Does BMI Calculator store my inputs anywhere?

No. Calculations happen entirely in your browser. Nothing about your inputs is saved or transmitted.

Can I use BMI Calculator offline?

Yes — once the page is loaded, it works without an internet connection.

Related guides

Ready to try it?

Run it in your browser: BMI Calculator. No upload, no signup, no daily limit.

Last reviewed May 2026. File-size limits, portal requirements, and software defaults change over time — always verify with the destination platform before uploading time-sensitive documents. References to third-party services and products are for descriptive purposes only and do not imply any partnership or endorsement.