Skip to content
Toolshed

BMI Calculator

Calculate your BMI in metric or imperial units, see the WHO category and the healthy weight range for your height.

  • No uploads
  • No limits
  • No signup
cm
kg
Input:
Height & weight
Output:
BMI
Runs on:
Your device
Size limit:
None
Account:
Not needed

How to use BMI Calculator

  1. Choose your units

    Switch between metric (cm, kg) and imperial (feet, inches, pounds).

  2. Enter height and weight

    Type your height and weight. The result updates as you type.

  3. Read your BMI

    See your BMI, the WHO category it falls in, and the weight range that is considered healthy for your height.

Why BMI Calculator on Toolshed

  • No uploads

    Everything runs in this browser tab. Your files never leave your device.

  • No limits

    No file-size caps, no daily quotas. Process as much as your device can handle.

  • No signup

    No account, no email, no watermark.

Frequently asked questions

What are the limits of BMI?

BMI only compares weight with height. It does not measure body fat, muscle, bone density or where weight is carried, so it can be misleading for athletes, people with a lot of muscle, older adults and pregnant women. Use it as a rough guide, not a verdict.

What do the WHO categories mean?

Below 18.5 is underweight, 18.5 to 24.9 normal weight, 25 to 29.9 overweight, 30 to 34.9 obese class I, 35 to 39.9 obese class II, and 40 or more obese class III. These are adult ranges.

Can I use it for children?

No. This calculator uses adult ranges and is not valid for children and teenagers, whose BMI is compared with growth charts for their age and sex. Nothing you enter leaves your browser.

Are my files uploaded anywhere?

No. BMI Calculator runs entirely in your browser. Your files are processed on your device and are never sent to a server.

Is there a file size limit?

No fixed limit. The only limit is your device's memory. Very large files work best in a desktop browser.

Is BMI Calculator really free?

Yes. There's no account and no watermark. A short optional ad, or a 20-second wait, unlocks each download. That's how we keep it free.