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BMI Calculator

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Calculate your body mass index, see your weight category, and check your healthy weight range in seconds.

Unit system
Your BMI
24.2
Healthy
Within the healthy weight range for adults 20+.
Healthy weight range
53.5 – 72.0 kg
For your height (BMI 18.5 – 24.9)
Ideal weight formulas
Devine65.9 kg
Robinson65.2 kg
Miller66.0 kg
Hamwi66.7 kg
BMI category scale
Underweight
< 18.5
Healthy
18.5 – 25
Overweight
25 – 30
Obese Class I
30 – 35
Obese Class II
35 – 40
Obese Class III
≥ 40
BMI is a screening tool, not a diagnosis. It can mislabel muscular people as overweight and mask body-fat issues in thin frames. If you're making a real health decision, pair it with waist circumference, body-fat %, and a chat with a clinician.

All processing happens in your browser — files never upload anywhere.

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About BMI Calculator

BMI Calculator is a free, browser-based utility on Toolspace. Nothing you use here is uploaded to a server — every operation happens on your device.

What is BMI Calculator best used for?

  • Free, private, in-browser processing.
  • Works on desktop and mobile.
  • No signup, no upload, no watermark.

How BMI Calculator works technically

modern browser APIs (WebAssembly, Canvas, or File API depending on the tool)

How to BMI Calculator

Every step runs on your device — nothing is uploaded.

  1. Step 1

    Open the tool

    Open BMI Calculator on Toolspace.

  2. Step 2

    Provide input

    Drop your file or paste your input into the drop zone.

  3. Step 3

    Get the result

    Click the action button — the result appears in seconds.

  4. Step 4

    Download

    Save the output to your device.

Frequently asked questions

What's included in Toolspace's calculators tools?

Toolspace's calculators category groups every calculators-related tool we ship — conversion, editing, compression, extraction, and specialty operations. Browse this page to see the current list.

Are calculators tools on Toolspace really free?

Yes. Every calculators tool is free with no signup, no watermark, and no upload limit. The site is ad-supported.

Which calculators tool should I start with?

If you're new, try the featured tool for this category — it's designed to solve the single most common calculators task. From there, explore adjacent tools linked at the bottom of every page.

Do calculators tools work on mobile?

Yes. Every calculators tool runs in your mobile browser (Chrome, Safari, Firefox, Brave) — no app install. Large files may be slower on mobile due to memory limits.

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