The equation
The Mifflin-St Jeor equation uses weight, height, age and a female or male equation setting to estimate resting energy expenditure in adults.
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Calorie needs calculator.
Start with a recognised resting-energy equation, then keep enough uncertainty visible to make the answer honest.
Estimate / Review / AdaptDaily energy estimate
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Calorie needs calculator
Estimated daily energykcal per day
Resting estimatekcal per day
Useful planning rangekcal per day
This is an adult planning estimate, not a weight-loss target or a clinical prescription. The equation uses female and male settings because that is how the original research was published.
What the number means
A starting estimate, not a verdict.
The result combines two different ideas. Resting energy is the estimated energy your body uses at rest. Daily energy applies a broad activity factor to account for ordinary movement and training.
The activity factor
The activity selector is deliberately broad. Work, walking, training volume and changes from day to day make it an approximation.
The real-world check
If you use the result for general planning, compare it with several weeks of consistent records rather than reacting to one day.
Common questions
Before you use the estimate.
What does this calorie calculator estimate?+
It estimates resting energy expenditure with the Mifflin-St Jeor equation, then applies a broad activity multiplier to create a daily planning estimate.
Is this my exact maintenance calorie number?+
No. Daily energy expenditure changes with body composition, movement, training, health and individual metabolism. Treat the result as a starting estimate and review the real pattern over time.
Can I use the result as a weight-loss target?+
The calculator does not prescribe a calorie deficit. Individual nutrition goals can require qualified advice, particularly during pregnancy, illness, eating-disorder recovery or clinical care.
Method source
Mifflin et al. Resting energy expenditure equation