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Enter your values, then click Calculate result.How this calculator helps
This resting energy calculator implements the simplified Mifflin–St Jeor equation for adult resting energy expenditure. BMR calculation formula and basic metabolic rate calculator searches often refer to resting equations, so the method is named explicitly rather than presenting all equations as interchangeable. It estimates energy under a resting model from measured mass, height, age and the published sex coefficient. It does not calculate Harris–Benedict, total daily expenditure, a weight-loss diet or a personalized treatment recommendation.
How to use it
- 1
Measure adult mass in kilograms and height in centimetres.
- 2
Enter an age inside the disclosed original-study adult range.
- 3
Choose the explicitly named published sex coefficient and review the model limitations.
- 4
Click Calculate result, then retain the equation name with the estimate.
Formula and methodology
REE = 10 × mass(kg) + 6.25 × height(cm) − 5 × age(years) + coefficient; coefficient is +5 for male or −161 for female.
The calculator applies the displayed arithmetic to the values entered on this device. It does not silently load a local tax rate, currency conversion or commercial assumption.
Worked calculation example
For an adult using the published male coefficient, mass 70 kg, height 175 cm and age 35 years produce 1,623.75 kcal/day: 700 + 1,093.75 − 175 + 5. With the female coefficient and otherwise identical inputs, the result is 1,457.75 kcal/day. Neither number is automatically a daily food target. No exercise, occupation or activity multiplier has been applied to these resting estimates.
How to interpret your result
The headline is a predicted resting expenditure in kcal/day. The kilojoule conversion uses 4.184 kJ per kilocalorie and describes the same modeled energy, not another estimate. No activity multiplier is applied. A difference from a wearable or diet app can arise because another product uses a different equation or total-expenditure assumptions. Compare method, units and input record before interpreting numerical differences.
For different inputs or formulas, use Macro Calculator; Food Protein Calculator; Calories Burned Calculator.
Related questions this calculator covers
- bmr calculation formula
- basic metabolic rate calculator
- mifflin st jeor calculator
- resting energy calculator
Scenario comparison
| Scenario | What it shows |
|---|---|
| Same adult record | changing only the coefficient changes the constant term by 166 kcal/day. |
| Height change | one additional centimetre adds 6.25 kcal/day within this equation. |
| No activity factor | the output remains a resting estimate rather than an exercise-day target. |
Common mistakes to avoid
- Calling the resting result a complete daily expenditure.
- Entering metres or pounds without converting the printed units.
- Treating decimal display precision as individualized metabolic accuracy.
Recalculate the 70 kg, 175 cm and age-35 example term by term and verify 1,623.75 for the male coefficient. Change only the coefficient and confirm a 166 kcal/day decrease. Multiply either result by 4.184 to check the kilojoule display. Preserve the equation and population context when comparing with a professionally measured resting metabolic rate.
Authoritative reference. Method reference checked for this worksheet. The calculation and examples are independently implemented; read the specific scope and units above.What can affect the result?
Resting energy and total expenditure differ
Resting energy represents one component of daily energy expenditure. Movement, exercise, food processing and individual physiological factors contribute additional energy use. The worksheet deliberately reports no activity factor because a multiplier introduces another model and personal assumptions. Do not subtract a diet deficit from this resting value and treat the result as an automatically suitable intake.
The published equation has a population context
The original 1990 study developed the equation using healthy adults aged 19 to 78. This worksheet follows that age range and rejects ages outside it. An equation fitted to a group can still differ materially from an individual measurement. Children, pregnancy, serious illness and unusual body-composition circumstances require appropriate professional assessment rather than extrapolating this simplified adult calculation.
Use measured units rather than guesses
Mass is entered in kilograms and height in centimetres. Divide pounds by 2.2046226218 to obtain kilograms; multiply total inches by 2.54 to obtain centimetres. Convert feet and inches into one total before using the field. A height entered as 1.75 is metres, not centimetres, and will be rejected. Recent measured values improve the input record but do not eliminate equation prediction error.
Understand the coefficient selector
The equation uses binary sex coefficients from its original model. The selector names those coefficients and does not infer identity, hormone status or body composition. Selecting one does not prove that the model accurately represents an individual. If neither coefficient appropriately describes a person’s clinical context, professional measurement or a suitable alternative assessment is more meaningful than treating a dropdown as personalized validation.
Numerical precision is not prediction accuracy
A result ending in a quarter calorie follows the equation coefficients and entered dimensions. That arithmetic precision should not be interpreted as a quarter-calorie prediction of real metabolism. The source equation has population-level uncertainty, while measurements, medications, physiology and conditions can change the relationship. Use the number as an estimate with its method name, not as a laboratory measurement or guaranteed daily requirement.
Scope and browser privacy
The tool accepts adult mass from 30 to 300 kg, height from 120 to 230 cm and age from 19 to 78 years as explicit interface guardrails. These bounds are not a claim that accuracy has been validated across every combination. Inputs are processed in your browser and are not submitted to a SolvePilot calculation service. Avoid including names or identifying details in notes you copy elsewhere.
Privacy and browser processing
Values entered on this page are processed in the current browser session. SolvePilot does not require an account and does not receive the values entered into the calculator. Refreshing or closing the page clears the working values unless the browser itself restores a previous session. Avoid entering identifying or account information because the calculation needs summary values only.
Accuracy and verification
Accuracy depends first on input quality. Confirm definitions, scales, dates and source information before entering a value. Keep an independent record of any result used for planning because this page does not create an official statement or retain a calculation history.
Limits of this estimate
Use only the disclosed input domains and model. Calling the resting result a complete daily expenditure. Review the method-specific boundaries above and the linked source before interpreting a result. Calculations use browser floating-point arithmetic; displayed digits are not a measure of real-world certainty. Your entries stay on this device and are not submitted to a calculation server.
Sources and review information
Frequently asked questions
Is this a total daily calorie requirement?＋
No. It estimates resting energy without an activity multiplier.
Does it use Harris–Benedict?＋
No. The implemented method is the simplified Mifflin–St Jeor equation.
Can it calculate a child’s needs?＋
No. The interface follows the adult age range stated for the original study.
Why are two coefficient options shown?＋
They reflect the binary coefficients in the published equation and do not establish individual clinical suitability.
Does it recommend a diet or deficit?＋
No. It supplies an equation estimate, not an intake prescription.