Adult BMR & Energy Scenario Calculator
Estimate resting energy expenditure and explore how an activity multiplier changes a daily-energy scenario. Formula results and goal adjustments are estimates rather than measured requirements or a prescribed diet.
Browser-based · No signup · Transparent assumptions
- 01Enter your values
- 02Adjust your settings
- 03Review your results
Enter your details to begin
Your BMR, TDEE, calorie target, and macros will appear here.
Calculations run in this browser. A Share link contains input values in its URL; review it before sharing private financial or health information. Currency selection changes notation, not exchange rates.
When to use this calculator
Compare resting-energy formula estimates and see how an activity multiplier changes an energy scenario. Use the formula and population limits to interpret the numbers; activity and goal controls do not create an individualized nutrition prescription.
Review the worked example and assumptions below, then use the supported report or copy controls to keep the result with its inputs. Calculations run in this browser; a shared URL can include the values you entered.
How to use Adult BMR & Energy Scenario Calculator
- Enter adult age, measured height and weight, and the formula's sex parameter.
- Select activity and an optional goal scenario. Supplying body-fat percentage switches the primary calculation to the supported body-composition formula.
- Compare the displayed estimates and assumptions. Copy or download a local report and review suitability before using it for a health decision.
A formula estimates resting expenditure
The Mifflin-St Jeor calculation uses weight, height, age and a sex-specific coefficient. The interface also compares supported alternative formulas. Activity multipliers and optional goal offsets extend the estimate into a scenario; they do not measure your actual energy use.
Worked example
Male parameter; age 30; weight 70 kg; height 175 cm
Mifflin-St Jeor: 10 x 70 + 6.25 x 175 - 5 x 30 + 5
Estimated resting expenditure: 1,648.75 kcal/dayAssumptions and limits
For adults; not a pediatric calculator, pregnancy/lactation model or clinical nutrition prescription. Body-fat input can carry substantial measurement error. Generic calorie floors and predicted weekly weight changes are not guarantees or universal safety thresholds.
Reference: Original Mifflin-St Jeor research. Model/source review: 19 October 2026. Results are illustrations or screening estimates; no personalized recommendation or eligibility decision is made.
Frequently asked questions
Why does entering body fat change the primary result?
The existing interface uses its body-composition equation when a valid body-fat percentage is supplied; otherwise it uses Mifflin-St Jeor.
Is a calculated goal target a recommended intake?
No. It is an arithmetic scenario based on an estimated expenditure and chosen offset.
Are activity multipliers precise?
No. They are broad assumptions and can differ from measured expenditure.
Read the estimate with its chosen input model
Enter the requested adult measurements and inspect which equation the interface uses when optional body-composition data is supplied.
Scope of this workflow
The existing calculator is not a diagnosis or clinical nutrition prescription. This editorial update adds no medical thresholds, safety claims or individualized recommendations.
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