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BMI & Calorie Calculator

Get your BMI, BMR and daily calorie targets for maintain, loss or gain. Results appear instantly, privately, right in your browser.

Units

Sex (for BMR)

Height

Weight

Age

yrs

Activity level

Calculated locally, nothing is sent anywhere.

These figures are general estimates for healthy adults and are informational only, not medical advice. BMI doesn't account for muscle mass or body composition. Talk to a doctor or dietitian before changing your diet or exercise.

From body metrics to a daily calorie target

BMI compares your weight to your height; BMR (via the Mifflin-St Jeor equation) is the energy you'd burn at rest; and TDEE multiplies that by your activity to estimate daily needs. From there we suggest calories to maintain, lose or gain weight at a steady pace. It all runs in your browser, fast, private and free forever. Building something health-related? Digital Heroes can help.

About BMI & Calorie Calculator

BMI & Calorie Calculator is a free, private tool that runs entirely in your web browser. It covers Body Mass Index, Basal Metabolic Rate (BMR) and total daily calorie needs (TDEE) in both metric and imperial units. Because everything happens locally on your device, your data is never uploaded to a server, there is no sign-up or installation required, and it keeps working offline. Like every free tool by Digital Heroes, it is 100% free with no limits.

What you can do

Calculate your BMI and see exactly which weight category you fall into on a colour-coded scale.

Find your healthy weight range for your height in kg or lb.

Estimate your resting calorie burn (BMR) using the clinically validated Mifflin-St Jeor equation.

Get your TDEE (total daily energy expenditure) based on your activity level.

See calorie targets for mild loss, weight loss, maintain and weight gain, all from one form.

Switch between metric and imperial units instantly, with no recalculation delay.

How to use BMI & Calorie Calculator

Open BMI & Calorie Calculator in your browser. No signup required.

Choose Metric or Imperial units and select your sex.

Enter your height, weight, age and activity level. Results update instantly.

Read your BMI category and healthy weight range on the colour scale.

Add your age to unlock BMR, TDEE and four calorie targets (loss, mild loss, maintain, gain).

Frequently asked questions

Is BMI & Calorie Calculator free?

Yes, BMI & Calorie Calculator is completely free for everyone. No sign-up, no account and no usage limits.

Is it private? Are my files uploaded anywhere?

No. BMI & Calorie Calculator runs entirely in your browser on your own device, so your data never leaves your computer and nothing is uploaded to a server.

Does it work offline?

Yes. This tool is a Progressive Web App, once the page has loaded it keeps working offline, and you can install it as an app from your browser.

Do I need to install anything or create an account?

No. Just open the page and start using it. Installing it as an app is optional and only adds offline convenience.

What does BMI & Calorie Calculator do?

It calculates your Body Mass Index (BMI), plots it on a category scale, estimates your resting calorie burn (BMR) via the Mifflin-St Jeor equation, and shows your TDEE plus four daily calorie targets: mild loss, weight loss, maintain and weight gain. Supports metric and imperial units.