Your free BMI and daily calorie calculator

Use this simple tool to calculate your BMI and estimate your daily calorie needs based on sex, age, weight, height and activity level.

Body Mass Index

Your BMI:

Target BMI:

Normal BMI range is 18.5 to 24.9.

Target normal weight:

Daily Calorie Needs

Estimated daily calories:

Uses the Mifflin-St Jeor equation with an activity multiplier to estimate TDEE.

What is BMI and how should you use it?

The Body Mass Index is weight in kilograms divided by the square of height in meters. It offers a simple screening of underweight, normal weight, overweight, or obesity. Combine BMI with professional advice for a fuller health picture.

How we estimate your daily calorie needs

We use the Mifflin-St Jeor formula plus an activity factor to estimate Total Daily Energy Expenditure (TDEE). This helps set goals for maintenance, weight loss, or weight gain with clearer targets.

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