Turn Your Body Stats Into Actionable Health Numbers
For health-conscious people who want fast BMI, BMR, and daily calorie estimates without installing an app. Enter height, weight, age, and gender, and get clear results with the exact formulas shown.
Results update live as you type — no button needed. The Example button fills a sample input.
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Why use Health Calculator?
Instantly compute BMI, BMR, and daily calorie needs in one place
Uses standard formulas so you can see exactly how each number is derived
No sign-up, no download, and no data stored on our servers
Works for both metric and imperial inputs when you convert units first
Clear results help you set realistic fitness and nutrition targets
FAQ
What is BMI and how is it calculated?
BMI (Body Mass Index) estimates body fat based on height and weight. The formula is weight in kilograms divided by height in meters squared. For example, 70 / (1.75 * 1.75) gives a BMI of about 22.9.
What is BMR and why does it matter?
BMR (Basal Metabolic Rate) is the number of calories your body burns at rest. It helps you understand your minimum daily energy needs. A common formula is 10 * weight(kg) + 6.25 * height(cm) - 5 * age + 5 for men.
How do I calculate my daily calorie needs?
Multiply your BMR by an activity factor. For moderately active people, a factor of 1.55 is common. For example, (10 * 70 + 6.25 * 175 - 5 * 30 + 5) * 1.55 gives your estimated daily calorie needs.
Is this health calculator free to use?
Yes, it is completely free and runs in your browser. No app installation or account is required.
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