Health

Two numbers say a lot about your health: your BMI and your daily calorie needs. The BMI calculator turns height and weight into a body mass index and healthy weight range, while the calorie calculator estimates your basal metabolic rate (BMR) and total daily energy expenditure (TDEE) from your age, sex and activity level.

Both tools use standard clinical formulas and explain the reasoning right on the page, so results are transparent rather than a mystery number pulled from nowhere. Everything runs in your browser — your height, weight and age are never sent to a server. Treat the results as a general guide, not a medical diagnosis.

Which tool should I use?

BMI calculator

All you need is height and weight. Use it for a quick check of your body mass index and a healthy weight range. It's the faster of the two if all you want is a single, quick number.

Calorie calculator

Adds age, sex and activity level to estimate your basal metabolic rate and daily calorie needs. Use it to plan a diet or set a calorie target. It takes a bit longer to fill in, but returns a target you can actually plan meals around.

Frequently asked questions

What's the difference between BMI and body fat percentage?

BMI is calculated from height and weight alone, so it can't distinguish muscle from fat. A muscular person can show a high BMI without excess body fat, so treat it as a general screening number rather than a precise measure.

How should I use the calorie calculator result?

The total daily energy expenditure (TDEE) it returns is the calories needed to maintain your current weight. To lose or gain weight, adjust your intake up or down from that baseline.

Do these results replace a medical diagnosis?

No. Both calculators use standard formulas for a general estimate. For an actual diagnosis or treatment plan, consult a healthcare professional.

Does the BMI calculator work for all ages?

The standard BMI formula is built for adults. Children and teenagers are still growing, so their healthy range is judged by age- and sex-specific percentile charts instead — this calculator's result isn't meant to be applied to them directly.