CalculationTime keeps the method visible so the number can be checked instead of blindly trusted.
Mifflin-St Jeor BMR = 10 × weight kg + 6.25 × height cm − 5 × age years + S, where S is +5 for the male equation and −161 for the female equation. The interface also offers a revised Harris-Benedict comparison.
Apply the formulaMifflin-St Jeor BMR = 10 × weight kg + 6.25 × height cm − 5 × age years + S, where S is +5 for the male equation and −161 for the female equation. The interface also offers a revised Harris-Benedict comparison.1,743 kcal/dayMifflin-St Jeor: 10×80 + 6.25×178 - 5×35 + 5. Resting estimate only.
Your live breakdown
Current inputs in the calculation
These values come from the controls above and update when the calculator changes.
The visible assumptions define the boundary of this calculation.
BMR is an estimate of resting energy use, not total daily expenditure.
Activity multipliers are rough context, not clinical prescription.
Population equations can be less accurate for unusual body composition, pregnancy, illness, adolescents, elite athletes or clinical conditions.
Master’s Tip
How to use the result well
Master’s Tip: BMR is the floor estimate. Multiply by activity to estimate total daily energy expenditure.
Printable record
What belongs in the saved calculation
Save the inputs, result, formula, assumptions, page URL and date together so the calculation can be reviewed later.
Sex for equation
Male equation
Age
35 years
Weight
80 kg
Height
178 cm
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Explain it like I'm 12
The BMR calculator estimates resting energy needs from weight, height, age and equation sex, then keeps activity-adjusted maintenance calories visible as context.
Mifflin-St Jeor BMR = 10 × weight kg + 6.25 × height cm − 5 × age years + S, where S is +5 for the male equation and −161 for the female equation. The interface also offers a revised Harris-Benedict comparison.
Worked example
An 80 kg, 178 cm, 35-year-old using the male equation gives 10×80 + 6.25×178 − 5×35 + 5 = 1,742.5 kcal/day.
Professional note
Master’s Tip: BMR is the floor estimate. Multiply by activity to estimate total daily energy expenditure.
Regional and unit assumptions
Mifflin-St Jeor metric equation. Health education only.
Assumptions and limitations
BMR is an estimate of resting energy use, not total daily expenditure.
Activity multipliers are rough context, not clinical prescription.
Population equations can be less accurate for unusual body composition, pregnancy, illness, adolescents, elite athletes or clinical conditions.
Methodology & Accuracy
How this calculator is checked
CalculationTime pages are built around visible arithmetic: the formula, assumptions, worked example and practical limitations are shown so the result can be checked rather than simply trusted.
Formula used
Mifflin-St Jeor BMR = 10 × weight kg + 6.25 × height cm − 5 × age years + S, where S is +5 for the male equation and −161 for the female equation. The interface also offers a revised Harris-Benedict comparison.
Standard or basis
Mifflin-St Jeor metric equation. Health education only.
Where a calculator follows a named legal, trade or industry standard, that standard is cited visibly. Otherwise the page uses transparent general arithmetic and states its limits.
Master's Tip
Master’s Tip: BMR is the floor estimate. Multiply by activity to estimate total daily energy expenditure.
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