How Harris-Benedict works
The revised Harris-Benedict equation (Roza & Shizgal, 1984) estimates Basal Metabolic Rate from your weight, height, age and sex. Multiplying BMR by an activity factor (1.2 to 1.9) gives your total daily calories. It tends to read slightly higher than Mifflin-St Jeor, which many dietitians now prefer.
How to use it
Enter your gender, age, weight and height, then pick your activity level. Your BMR and maintenance calories update instantly. Compare the number with our Mifflin-St Jeor based BMR and TDEE calculators.
Frequently asked questions
- Harris-Benedict or Mifflin-St Jeor?
- Both are widely used. Mifflin-St Jeor is generally considered slightly more accurate today; Harris-Benedict often estimates a little higher.
- What is BMR?
- Basal Metabolic Rate is the calories your body burns at complete rest to stay alive.
- How do I get daily calories?
- Multiply BMR by an activity factor from 1.2 (sedentary) to 1.9 (athlete).
- How accurate is it?
- It is an estimate (around 10% for most people). Track results for 2–3 weeks and adjust.