BMI Calculator
Calculate your body mass index in metric or US units, see the WHO category and the healthy weight range for your height.
Runs on your device
Result
Results appear here as you type.
What it does
BMI is weight divided by height squared. It is a quick screening number used by doctors worldwide, but it does not measure body fat directly and can mislead for very muscular people, older adults and some ethnic groups.
How to use it
- Choose metric or US units.
- Enter weight and height.
- Read your BMI, category and healthy range.
Example
70 kg at 175 cm gives a BMI of 22.9. Select Try an example above to see it.
When it helps
- A quick health check.
- Tracking progress over months.
- Understanding a doctor’s comment.
Questions
What are the categories?
Under 18.5 underweight, 18.5 to 24.9 healthy, 25 to 29.9 overweight, 30 and above obesity (WHO adult cutoffs).
Does BMI apply to children?
No. Children use age and sex specific percentiles.
More health & fitness tools
See all 10- Sleep Calculator Find the best time to go to bed or wake up so you finish complete 90-minute sleep cycles and wake up feeling less groggy.
- Water Intake Calculator Estimate how much water to drink each day from your weight, exercise and climate, in litres, glasses and ounces.
- Body Fat Calculator (US Navy Method) Estimate body fat percentage from height, neck, waist and hip measurements using the US Navy formula, with fat and lean mass.
- Macro Calculator Split a daily calorie target into protein, carbohydrate and fat grams using a balanced, higher protein or lower carb ratio.
- Running Pace Calculator Work out running pace per km or mile from distance and time, or predict a finish time for 5K, 10K, half marathon and marathon.
- One Rep Max Calculator Estimate your one rep max from any set of up to 12 reps using the Epley, Brzycki and Lombardi formulas, with a percentage training table.
People also use
Browse all 200 tools- IPv4 Subnet Calculator (CIDR) Calculate network address, broadcast, usable host range, subnet mask, wildcard mask and host count from any IPv4 address and CIDR prefix. Developer
- URL Slug Generator Turn titles into clean, lowercase URL slugs: accents removed, symbols stripped, optional stop word removal and a maximum length that never cuts a word in half. SEO
- Online Stopwatch with Laps An accurate online stopwatch with lap times, split differences, keyboard control and CSV export of your laps. Works offline once loaded. Time & productivity
- Meme Generator Add classic bold top and bottom captions to your own image to make a meme, with automatic text sizing and wrapping, and download it. Media & files