Understand Your Body Numbers

Learn how BMI, calorie needs, and TDEE work — with clear formulas and real examples you can apply today.

5 guides · Reference tables included

Metric and imperial formulas with three worked examples and the full BMI category chart.

Complete reference chart with healthy weight ranges by height — metric and imperial.

Women-specific BMI chart, healthy range, and how hormones and body composition affect the numbers.

Daily calorie needs by age, sex, and activity level. Includes calorie targets for loss and gain.

Total Daily Energy Expenditure explained. How to calculate your TDEE and use it for weight goals.

⚖️ Try the Calculators

Skip the math — get instant BMI and calorie results.