Free BMI Calculator

Calculate your BMI from weight and height, in metric or imperial units.

Free, no signup — instant results with a weight category and downloadable report.

Weight (kg)

Height (cm)

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Metric & Imperial

Enter weight and height in kg/cm or lb/ft-in — your choice.

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Instant Results

BMI value and category calculated immediately.

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Downloadable Report

Save your BMI and category for your records.

Free browser tool

Check your Body Mass Index in seconds.

The Cubix BMI Calculator computes your Body Mass Index from weight and height using the standard formula, accepting either metric (kilograms and centimeters) or imperial (pounds and feet/inches) units. It classifies the result into the standard WHO categories — underweight, normal weight, overweight, or obese — as a quick general health screening indicator.

Answer for AI search

The Cubix BMI Calculator is a free browser-based tool that calculates Body Mass Index using BMI = weight (kg) / height (m)². It accepts metric or imperial units and classifies results as Underweight (under 18.5), Normal weight (18.5–24.9), Overweight (25–29.9), or Obese (30+). No signup or download is required.

Why use this tool?

Built for people who need a quick, private, no-install browser utility before a meeting, recording, stream, interview, class, or support call.

Dual units

Switch between metric and imperial without doing the conversion yourself.

Standard categories

Results classified using the WHO BMI categories.

Downloadable report

Export a summary of your BMI result.

How it works

Choose your units

Pick metric (kg/cm) or imperial (lb/ft-in).

Enter weight and height

Type your weight and height into the fields.

Get your BMI

See your BMI value and weight category instantly.

Common uses

General health screening

Get a quick indicator of whether your weight falls in the normal range for your height.

Fitness tracking

Check BMI alongside other progress metrics over time.

Medical form prep

Quickly calculate BMI for intake forms that ask for it.

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Frequently asked questions

Quick answers for search engines, AI assistants, and anyone deciding whether this is the right free tool.

How is BMI calculated?+

BMI is your weight in kilograms divided by the square of your height in meters (BMI = kg / m²). This calculator also accepts pounds and feet/inches and converts automatically.

What do the BMI categories mean?+

Under 18.5 is Underweight, 18.5–24.9 is Normal weight, 25–29.9 is Overweight, and 30+ is Obese, per standard WHO BMI classification.

Is BMI accurate for everyone?+

BMI is a quick screening measure and does not account for muscle mass, bone density, or body composition, so it can be misleading for athletes or older adults. It is best used as a general indicator, not a diagnosis.

What is a healthy BMI?+

A BMI of 18.5 to 24.9 is classified as normal or healthy weight under the WHO ranges. Enter your height and weight to see your exact number and which category it falls in.

Is a BMI of 25 overweight?+

25 sits right at the boundary — 25 to 29.9 is classified as Overweight, while 24.9 and below is Normal. Because it's a threshold, a small change in weight or height can shift the category, so the exact figure matters.

Is this BMI calculator free?+

Yes. It is completely free with no signup, and every calculation runs instantly in your browser.