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BMI calculator

CDC adult categories

Enter your weight and height in pounds and feet/inches or kilograms and centimeters to get your BMI, its CDC adult category and the healthy weight range for your height.

Try:
Pounds (US) or kilograms (metric)
US: 5'10" or 70 (inches). Metric: centimeters

Fill in the fields to see the result.

How to use it

  1. Pick US or metric units (remembered next time).
  2. Enter weight, and height like 5'10" or 178 cm.
  3. Read BMI, category and the healthy weight range.

Details

Formula
kg ÷ m², or 703 × lb ÷ in²
Categories
Under 18.5 underweight, 18.5-24.9 healthy, 25-29.9 overweight, 30+ obesity
For
Adults 20 and over; children use growth-chart percentiles

Questions

Is BMI accurate?

BMI is a quick screen, not a diagnosis. It doesn't measure body fat, so muscular people can read high and older adults low. Talk to a clinician about your health.

Are the cut-offs the same for everyone?

The CDC and WHO use 25 and 30. Some Asian health bodies use lower cut-offs, with overweight from 23.

Can children use it?

No. For ages 2-19 the CDC uses BMI-for-age percentiles, which this calculator doesn't do.

Is what I type sent anywhere?

No. The calculation runs in this browser tab with the same code our MCP server uses. Nothing you type is sent to a server or saved, apart from settings like filing status, which stay in this browser.

Can an AI agent use this?

Yes. The same function is a tool on our free MCP server at tools.cuelark.com/mcp, so ChatGPT, Claude or Cursor get exactly the answer this page shows. 'Copy MCP call' gives you the arguments.