Calorie Calculator
Estimate adult resting energy and daily calories with Mifflin–St Jeor, metric or imperial units, an activity factor and adjustable scenarios. Calculations stay local.
Estimate daily calories
An adult estimate using the Mifflin–St Jeor equation and your chosen activity factor.
Sources and assumptions
Resting equation: 10 × kg + 6.25 × cm − 5 × age, then +5 for males or −161 for females. Daily energy = resting energy × activity factor. Factors and scenarios are assumptions, not an individual nutrition plan.
The original equation studied healthy adults aged 19–78; accuracy outside that group is not established here.
Mifflin–St Jeor (1990) ↗NIDDK ↗Resting equation: 10 × kg + 6.25 × cm − 5 × age, then +5 for males or −161 for females. Daily energy = resting energy × activity factor. Factors and scenarios are assumptions, not an individual nutrition plan.