Harris-Benedict Calculator
Classic BMR formula - the traditional approach to calorie calculation
How the Harris-Benedict Formula Works
Originally developed in 1919 and revised in 1984, the Harris-Benedict equation was one of the first formulas to calculate BMR. While slightly less accurate than newer formulas, it remains widely used and provides good estimates for most people.
Men: BMR = 88.362 + (13.397 × weight) + (4.799 × height) - (5.677 × age)
Women: BMR = 447.593 + (9.247 × weight) + (3.098 × height) - (4.330 × age)
Frequently Asked Questions
Different calculators may use different formulas or activity multipliers. We use the Mifflin-St Jeor equation, which is considered one of the most accurate for most people. However, individual metabolism can vary by 10-20% from these estimates.
These are average daily targets. It's normal to eat slightly more some days and less on others. Focus on your weekly average rather than being exact every single day. Listen to your body's hunger and fullness cues.
If you're not seeing results after 2-3 weeks, you may need to adjust. Your actual metabolism might be higher or lower than calculated. Try adjusting by 100-200 calories and monitor for another 2 weeks. Also ensure you're tracking your food accurately.
The 30/40/30 split (protein/carbs/fat) is a balanced approach suitable for most people. However, athletes, people with medical conditions, or those following specific diets (keto, vegan, etc.) may need different ratios. Consult a nutritionist for personalized recommendations.