Worked example: BMR Calculator
Mifflin male. This fixed reference example shows one complete scenario; the interactive results above use your current inputs.
View the example inputs
- Measurement units
- Metric
- Body weight
- 80 kg
- Height
- 180 cm
- Age
- 30 years
- Equation sex profile
- Male
- Activity multiplier
- Sedentary estimate (1.2)
| Calculated quantity | Example result |
|---|---|
| Estimated resting energy (BMR/RMR equation) | 1,780 kcal/day |
| Estimated maintenance energy | 2,136 kcal/day |
Understanding energy and nutrient estimates
Keep an estimate separate from a measured requirement
Energy equations use measurements and a reference population to estimate an average requirement. Activity multipliers add another assumption. A calculated maintenance amount can differ from measured expenditure, and a daily energy target entered in a form is not automatically a clinical recommendation.
Macronutrient grams and energy shares are different units. Converting grams to energy uses the factors stated by the calculator. Compare percentages only when their denominator is the same, and check that an entered energy target leaves a nonnegative remainder for the nutrients being solved.
Read the page’s specific input convention
A protein factor in grams per kilogram needs body mass in the expected unit. An activity MET value needs a matching activity and intensity. A program-specific food score must come from the program when the calculator asks for an official entered value.
Use the formula and worked example below to identify what was estimated and what was entered. Individual nutritional needs and medical treatment require context that a general-purpose calculator does not establish.
Formula and calculation method
BMR estimate=10×kg+6.25×cm−5×age+(5 male or −161 female). Maintenance estimate=BMR×selected activity multiplier.
The activity factors are heuristic scenarios, not measurements. This tool estimates maintenance and does not prescribe a calorie deficit.
Scope and Limitations
- For nonpregnant adults aged 20–78 within the entered measurement ranges. Individual energy expenditure can differ substantially; not a substitute for measured calorimetry or clinical nutrition assessment.
Reference Sources
Frequently asked questions
How does this calculator work?
BMR estimate=10×kg+6.25×cm−5×age+(5 male or −161 female). Maintenance estimate=BMR×selected activity multiplier.
What assumptions should I check?
For nonpregnant adults aged 20–78 within the entered measurement ranges. Individual energy expenditure can differ substantially; not a substitute for measured calorimetry or clinical nutrition assessment. The activity factors are heuristic scenarios, not measurements. This tool estimates maintenance and does not prescribe a calorie deficit.
Can I save or print this calculation?
Use Copy link with inputs to reproduce the scenario, Download results for a text record, or Print. Where a schedule is shown, its CSV download includes every row.
What happens when I change measurement units?
The linked unit selector converts the existing measurement so it represents the same physical quantity. Entering a different number after switching units changes the underlying input. The result’s own units are shown beside its value.