Calorie Calculator

Updated Oct 2026

Equation sex term

Select the coefficient set used by the published Mifflin-St Jeor equation; this field does not define gender identity.

Age

The implemented adult equation is not a pediatric assessment.

Standing height

Measure without shoes.

Body weight

Use a current measured body weight.

Typical activity factor

Choose the factor that represents an ordinary week. Do not add routine exercise calories again afterward.

Adjustment from maintenance

Enter a negative percentage below maintenance, zero for maintenance, or a positive percentage above maintenance.

Guest calculations stay on this device. Signed-in results sync privately.

Your result

Daily calorie planning target

Enter your values, then calculate to see a verified result.

Inputs usedReview the information used for this result.

Full calculation and sourcesReview the equation, normalized inputs, assumptions, and version.

Versioned calculationFormula v1.0.0

What is calculated

A transparent daily calorie planning target from estimated maintenance and an explicit percentage adjustment.

Method

Estimate maintenance first, then apply the entered percentage rather than silently assigning a universal deficit or surplus.

Important boundary

This is a planning estimate. It does not prescribe a safe intake or predict exact weekly weight change.

Estimate maintenanceCalculate resting energy and apply activity once.Maintenance remains visible.

Apply your adjustmentMultiply maintenance by the entered signed percentage.-15% is below; +10% is above.

Review and calibrateUse a multi-week trend rather than an exact forecast.Do not chase daily scale changes.

Interpretation

kcal/day is the calculated planning target.

The adjustment is explicit and reversible; it is not an automatic prescription.

Reassess from measured trends and professional context where needed.

Use this result

TDEE CalculatorInspect maintenance without a goal adjustment.Calorie Deficit CalculatorExplore deficit-specific inputs and limitations.Macro CalculatorConvert a chosen calorie target into grams.

Keep exploring

Method and test recordFormula v1.0.0

Recorded scope: health-nutrition-foundations
Publisher: CalculatorGeek
Recorded review date: 2026-10-04
Next source review: 2027-10-04
Definition fixtures: 4 configured scenarios
Published examples: 4 shown below

Recorded method

Independently calculate equation branches, activity factors, positive/zero/negative adjustments, alternate units, and invalid ranges.

These records describe the published model and reference tests. A test-case count is not a certification of every possible input or an independent specialist review. Editorial policy

Known limitations

No universal percentage is safe or appropriate for every person.
Linear energy arithmetic does not predict body-weight change because expenditure and body composition adapt.
Food tracking and activity estimates contain error.
Children, pregnancy, lactation, eating disorders, underweight, or medical nutrition needs require professional guidance.

Method sources

Latest model update

2026-10-04 - Initial CalculatorGeek shared-system nutrition implementation with source-backed method, fixtures, content, and result journey.

Reference inputs and expected results

Up to 12 examples from the configured definition fixtures are shown. Expected values use the stated output units; invalid inputs are intended to be rejected.

Case	Inputs	Expected result
negative adjustment reference	Equation sex term: male; Age: 30 years; Standing height: 180 cm; Body weight: 80 kg; Typical activity factor: moderate; Adjustment from maintenance: -15 percent	Estimated maintenance: 2759 kcal/day; Selected daily adjustment: -413.85 kcal/day; Daily calorie planning target: 2345.15 kcal/day (allowed numeric tolerance: 0.0001)
positive adjustment reference	Equation sex term: female; Age: 35 years; Standing height: 165 cm; Body weight: 65 kg; Typical activity factor: light; Adjustment from maintenance: 10 percent	Daily calorie planning target: 2034.690625 kcal/day (allowed numeric tolerance: 0.0001)
zero adjustment boundary	Equation sex term: male; Age: 30 years; Standing height: 180 cm; Body weight: 80 kg; Typical activity factor: moderate; Adjustment from maintenance: 0 percent	Selected daily adjustment: 0 kcal/day; Daily calorie planning target: 2759 kcal/day
invalid adjustment	Equation sex term: male; Age: 30 years; Standing height: 180 cm; Body weight: 80 kg; Typical activity factor: moderate; Adjustment from maintenance: -50 percent	Reject invalid input: adjustment_percent

Report an issue with this tool. Include the page URL, units, expected answer, and steps to reproduce. Do not include sensitive personal information.

On this page

What the Calorie Calculator answers

Calculate a daily calorie planning target from a visible maintenance estimate and a user-chosen signed percentage adjustment.

Unlike fixed 250-, 500-, or 750-kcal presets, the page preserves the actual percentage, maintenance estimate, and weekly energy arithmetic without promising a body-weight outcome.

Start with the Health calculators hub when you need a different nutrition or body-measurement workflow.

How to use the Calorie Calculator

Enter the adult energy-equation inputs.
Choose a typical-week activity factor.
Enter the percentage adjustment you intend to explore.
Review maintenance, daily adjustment, and the resulting target together.

For the closest upstream or downstream calculation, use the TDEE Calculator. Inspect maintenance without a goal adjustment.

Formula, variables and calculation order

First calculate maintenance = Mifflin-St Jeor REE × activity factor.

Then calculate daily adjustment = maintenance × adjustment% / 100 and target = maintenance + daily adjustment. The seven-day value is arithmetic context, not a weight forecast.

To compare this result with a related method, open the Calorie Deficit Calculator. Explore deficit-specific inputs and limitations.

Worked examples and boundary checks

2,759 kcal/day maintenance and -15%

adjustment = 2,759 × -0.15 = -413.85; target is 2,345.15 kcal/day, displayed as 2,345.

Boundary check

A calculated low intake is not automatically appropriate. The tool reports the math and the chosen assumption; it does not clear the target medically.

How to interpret the result

The primary result is the energy target implied by the estimated maintenance value and the exact adjustment you entered. It should remain attached to those assumptions.

No universal percentage is safe or appropriate for every person.
Linear energy arithmetic does not predict body-weight change because expenditure and body composition adapt.
Food tracking and activity estimates contain error.
Children, pregnancy, lactation, eating disorders, underweight, or medical nutrition needs require professional guidance.

For another relevant cross-check, continue with the Macro Calculator. Convert a chosen calorie target into grams.

Inputs, outputs and result meaning

Keeps maintenance, the exact signed percentage, daily change, and weekly energy arithmetic visible while refusing to convert them into a guaranteed weight-change forecast.

Inputs

Equation sex term: Select the coefficient set used by the published Mifflin-St Jeor equation; this field does not define gender identity.
Age: The implemented adult equation is not a pediatric assessment.
Standing height: Measure without shoes.
Body weight: Use a current measured body weight.
Typical activity factor: Choose the factor that represents an ordinary week. Do not add routine exercise calories again afterward.
Adjustment from maintenance: Enter a negative percentage below maintenance, zero for maintenance, or a positive percentage above maintenance.

Outputs

Daily calorie planning target: Reported in kcal/day as the primary result.
Estimated maintenance: Reported in kcal/day.
Estimated resting energy: Reported in kcal/day.
Selected daily adjustment: Reported in kcal/day.
Seven-day energy adjustment: Reported in kcal/week.

Keep the result, selected inputs, unit labels, and stated limitations together when saving or sharing the calculation.

Frequently asked questions

Is this a weight-loss calculator?

It can explore a negative adjustment, but it does not prescribe a deficit or forecast weight loss.

Why use a percentage?

A percentage keeps the adjustment visible relative to the person’s estimated maintenance instead of hiding a fixed universal subtraction.

Does the target include exercise?

Routine exercise is already represented when the selected activity factor includes it.

What if the result seems too low or high?

Recheck inputs and activity choice, then use professional guidance when the target could affect health or treatment.

How should I update the target?

Use consistent intake and multi-week trend data; do not revise from one day.

Primary sources and evidence limits

Sources were checked 2026-10-04. They support the named equation, reference range, label arithmetic, or evidence boundary; they do not convert an estimate into individualized medical nutrition advice.