Know Your BMI in Seconds

Key Terms

Gauge
A low-to-high visual scale with a marker showing where your BMI sits among the thresholds.
Healthy weight range
The weight at which your BMI stays inside the normal 18.5 to 24.9 band for your height.
WHO classification
The World Health Organization bands: underweight, normal, overweight, and three obesity classes.

Who This Is For

Screening

Get a fast read on where your weight sits relative to your height on the WHO scale.

Fitness Tracking

Check your BMI alongside workouts to watch the trend over months and years.

Family Checks

Quickly work out the adult BMI for household members without juggling unit conversions.

Calculate your BMI instantly in any browser — no account, no uploads, just your weight and height.

Frequently Asked Questions

Is Masswise really free to use?

Yes. There is no charge, no sign-up, and no usage limit. You can calculate your BMI as often as you like entirely in your browser.

What is a healthy weight range?

It is the weight at which your BMI lands inside the normal band of 18.5 to 24.9 for your exact height, shown in kilograms or pounds to match your input.

Is this the same as a child BMI calculator?

No. Adults use the fixed WHO bands. Children and teens use BMI-for-age percentiles from CDC growth charts, which are a different scale.

How does it calculate BMI?

It divides your weight in kilograms by your height in metres squared, using the standard WHO formula, and converts imperial units for you automatically.

How accurate is BMI?

It is exact for the numbers you enter and uses the standard WHO classification. BMI does not separate muscle from fat, and it is most reliable for sedentary adults with average muscle mass.

How It Works

1

Pick your units

2

Enter weight and height

3

Read your result

Who Is This For?

Qualify Buyers

Quickly determine what price range works for each client.

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Works Offline

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Streamline Workflow

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Build Trust

Present transparent numbers that help clients decide.

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