This is an adult energy estimate, not a prescribed intake target. It is not designed for children or teens, whose energy needs vary during growth. For personal nutrition questions, talk with a qualified healthcare professional or registered dietitian.
How this adult energy estimate is calculated
This tool estimates resting energy expenditure with the Mifflin–St Jeor equation and then multiplies that estimate by the activity factor you select. It is an equation-based estimate—not a measurement of your metabolism or a personalized nutrition plan.
Resting-energy equation
Using weight in kilograms, height in centimeters, and age in years, the calculator uses one of these published equations: men: 10 × weight + 6.25 × height − 5 × age + 5; women: 10 × weight + 6.25 × height − 5 × age − 161. It then multiplies the estimate by the selected activity factor to approximate total daily energy expenditure (TDEE).
What changes the estimate?
- The result changes with the height, weight, and age entered and with the selected activity level.
- The activity labels are broad estimates; actual daily movement and energy needs vary from person to person.
- The equation does not account for every health condition, medication, pregnancy, or individual difference.
This calculator is designed for adults and should not be used to set calorie targets for children or teens, whose bodies are still growing. It does not recommend a weight-loss deficit or a weight-gain target. For personal nutrition questions, seek guidance from a qualified healthcare professional or registered dietitian. The original Mifflin–St Jeor equation was published in the American Journal of Clinical Nutrition and was developed using adult participants.
Tips for accurate results
Be honest about your activity level, since that multiplier moves the result more than any other input, and people commonly rate themselves as more active than they are. Re-run the calculation if your weight or routine changes noticeably.
Common mistakes and limits
The result estimates energy use for a typical adult and can be off by 10 to 20 percent. It is not appropriate for children, pregnancy, or people managing medical conditions. For personal goals or health concerns, a doctor or registered dietitian can give guidance that fits you.
Learn more: Calories, BMR and TDEE explained.