Your result
Click Calculate
Enter your values, then click Calculate result.How this calculator helps
The Harris Benedict calculator on this page uses the Roza–Shizgal revision published in 1984. It is a separately named equation from Mifflin–St Jeor, rather than a new label on the same formula. The page exposes the coefficient set, measurement units and adult input scope. It is useful for comparing a documented resting-energy calculation, while keeping a population estimate distinct from measured expenditure and a personal food-intake recommendation.
How to use it
- 1
Measure mass in kilograms and height in centimetres.
- 2
Enter adult age within the supported bounds and choose the intended published coefficient.
- 3
Click Calculate result to evaluate the revised 1984 resting equation.
- 4
Record the version and units; do not turn the result directly into an intake prescription.
Formula and methodology
1984 male equation: 88.362 + 13.397W + 4.799H − 5.677A. Female equation: 447.593 + 9.247W + 3.098H − 4.330A. W is kg, H cm, A years; result is kcal/day.
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 a 70 kg adult, height 175 cm, age 35 and the published male coefficient, the expression is 88.362 + 937.79 + 839.825 − 198.695 = 1,667.282 kcal/day. The female coefficient with those same measurements gives 1,485.483 kcal/day. These are resting-equation estimates. No activity multiplier, weight-loss subtraction, meal plan or exercise allowance is applied to either output.
How to interpret your result
Read the model name and input units alongside the kcal/day result. The kJ/day value is the same numerical energy estimate converted using 4.184 kJ per kcal, not a second independent prediction. An estimate from this equation can be compared with another method for study or documentation, but agreement between formulas does not prove that either measures an individual’s actual needs.
For different inputs or formulas, use Resting Energy Calculator; Macro Calculator; Food Energy Calculator.
Related questions this calculator covers
- harris benedict calculator
- harris benedict equation calculator
- revised harris benedict calculator
Scenario comparison
| Scenario | What it shows |
|---|---|
| Male coefficient example | 70 kg, 175 cm and 35 years gives 1,667.282 kcal/day. |
| Female coefficient example | the same measurements give 1,485.483 kcal/day. |
| Age sensitivity | one extra year reduces the male expression by 5.677 kcal/day with other inputs fixed. |
Common mistakes to avoid
- Confusing the original and revised coefficient sets.
- Entering pounds as kilograms.
- Using a resting estimate as a personal intake prescription.
Calculate each contribution in the male example independently and sum 1,667.282. Repeat with the female expression. Increase age by one and confirm the model-specific age coefficient is subtracted. Convert kcal/day to kJ/day by multiplying by 4.184. Compare published coefficients in the linked primary research discussion and preserve the revised-1984 label with the result.
Authoritative reference. Reviewed on 6 October 2026 for the specific disclosed method or measurement context. The arithmetic is independently implemented. A linked reference does not certify an individual result or extend the worksheet beyond its stated scope.What can affect the result?
Equation version is part of the answer
Original Harris–Benedict coefficients and the revised 1984 coefficients are not interchangeable. This worksheet implements only the revised version and displays that model name in the result. A spreadsheet using the original expression can disagree without having an arithmetic mistake. Compare the coefficients before comparing final numbers. The page does not silently select a version based on age, weight or a desired calorie result.
Use kilograms and centimetres
Body mass is entered in kilograms and height in centimetres. Pounds require multiplication by 0.45359237 to become kilograms; inches require multiplication by 2.54 to become centimetres. Entering inches in a centimetre field changes the height contribution substantially. These inputs describe current measured body size, not a target weight or an idealized height. Keep the measurement date if comparing calculations over time, and avoid inventing extra precision beyond the measurement.
The coefficient choice is explicit
The published expressions have male and female coefficient sets. Choose the coefficient used in the intended equation comparison rather than treating the dropdown as a complete account of physiology. The two expressions give different outputs for otherwise identical measurements. This mathematical choice does not establish whether the model is suitable for every individual. Where that suitability is uncertain, an appropriate professional assessment or measured method is more informative than choosing the coefficient that produces a preferred number.
Adult bounds prevent unsupported extrapolation
The interface accepts ages eighteen through sixty-five, masses thirty through two hundred fifty kilograms and heights one hundred twenty through two hundred thirty centimetres. These are bounded worksheet controls, not a claim that every combination is validated by the original study. Children, pregnancy-related requirements, illness and individual clinical nutrition are outside the disclosed task. A value within the bounds can still be unsuitable for a person’s actual circumstances.
Resting estimate is not daily food allowance
The equation estimates a resting energy quantity. Daily activity, exercise, digestion and other factors are not entered or inferred. The result therefore is not total daily energy expenditure, a weight-maintenance prescription or a recommended calorie intake. Applying an activity factor afterward is a separate modeling decision and requires its own evidence and assumptions. The worksheet keeps that decision separate so the resting equation can be reproduced without a hidden multiplier.
Measured expenditure can differ
A population equation can overestimate or underestimate an individual measurement. Body composition and circumstances not represented by weight, height, age and the coefficient choice can affect the difference. More decimal places do not reduce that model error. Indirect calorimetry is a different measurement approach and is not performed by this calculator. If a result will inform clinical nutrition, interpretation belongs with appropriate assessment rather than the equation output alone.
Compare methods on identical inputs
When comparing this result with another resting equation, keep the same mass, height and age. The protected Mifflin–St Jeor calculator uses its own coefficients and scope; differences reflect the selected model as well as its assumptions. A comparison does not reveal which estimate is correct for an individual without suitable measurement. Record the equation version and units with every value so a later reader can distinguish a real change in measurements from a change of formula.
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
Confusing the original and revised coefficient sets. Read the model name and input units alongside the kcal/day result. The kJ/day value is the same numerical energy estimate converted using 4.184 kJ per kcal, not a second independent prediction. An estimate from this equation can be compared with another method for study or documentation, but agreement between formulas does not prove that either measures an individual’s actual needs. Entries remain on this device for the calculation and are not submitted to a calculation server. Browser floating-point arithmetic and displayed rounding do not establish real-world measurement certainty.
Sources and review information
Frequently asked questions
Which Harris–Benedict version is used?＋
The revised 1984 Roza–Shizgal coefficients.
Does it include activity level?＋
No. It reports the resting-equation estimate only.
Can I enter pounds and inches directly?＋
No. Convert mass to kg and height to cm first.
Is the output a calorie-intake target?＋
No. It is not a dietary prescription or total daily expenditure.
Is this the same equation as Mifflin–St Jeor?＋
No. They use distinct published coefficient sets.