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Frequently Asked Questions

Evidence-based answers to common health calculator questions

How do I calculate my BMI?

BMI (Body Mass Index) is calculated by dividing your weight in kilograms by your height in meters squared. According to the World Health Organization (WHO), a BMI of 18.5–24.9 is considered normal, 25–29.9 is overweight, and 30+ is obese. Use the BMI calculator above for instant results.

How many calories should I eat per day?

Daily calorie needs depend on your age, sex, height, weight, and activity level. The USDA Dietary Guidelines (2025–2030) recommend 1,600–2,400 kcal/day for adult women and 2,000–3,000 for adult men. Our TDEE calculator gives you a personalized estimate using the Mifflin-St Jeor formula.

What is a healthy body fat percentage?

According to the American Council on Exercise (ACE), healthy body fat is 21–33% for women and 8–19% for men. Athletes typically fall in the 14–20% range for women and 6–13% for men. Our body fat calculator uses the U.S. Navy circumference method for accurate estimation.

What is the difference between TDEE and BMR?

BMR (Basal Metabolic Rate) is the calories your body needs at complete rest to maintain organ function. TDEE (Total Daily Energy Expenditure) is BMR multiplied by your activity factor. For weight management — losing, maintaining, or gaining — always use TDEE, not BMR.

Are HealthCalcPro calculators medically accurate?

All calculators use peer-reviewed formulas sourced from primary references: Mifflin-St Jeor for BMR/TDEE, U.S. Navy Method for body fat, and WHO standards for BMI. Results are statistical estimates based on population averages and should be used alongside — not instead of — professional medical advice.

Is my data stored or shared?

No. All calculations run entirely in your browser. HealthCalcPro does not store, transmit, or share any personal health data you enter. No account or registration is ever required.

Sources: WHO Obesity Fact Sheet · ACE Body Fat Norms · Dietary Guidelines for Americans (HHS/USDA)