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How many calories intake?

How many calories intake: calculation method, required inputs, worked check, limitations and a link to Calorie Calculator. Reviewed 25 September 2026.

By Uddhav Gopani, FounderPublished 25 September 2026Reviewed 25 September 2026

Computing your calorie intake target is a two-step estimate: first your resting burn (BMR), then a multiplier for everything you do on top of resting. Mifflin–St Jeor is the standard BMR equation: 10 × weight(kg) + 6.25 × height(cm) − 5 × age + 5 for men, and the same with −161 for women.

What this specific question is asking

Multiply BMR by the activity factor that honestly describes your week: 1.2 sedentary, 1.375 lightly active, 1.55 moderately active, 1.725 very active, 1.9 athlete-level. The product is maintenance. Subtract for loss, add for gain — 300 to 500 kcal steps, not heroic round numbers.

Verify the activity factor choice against a step count or training log before trusting the result: most people overrate activity by one full tier, which inflates the target by 200–300 kcal and silently erases any planned deficit.

Inputs to verify

Verify weight (kg) before calculation; if this value uses a different unit, period or definition, convert or restate it first.
Verify height (cm) before calculation; if this value uses a different unit, period or definition, convert or restate it first.
Verify age (years) before calculation; if this value uses a different unit, period or definition, convert or restate it first.
Verify sex before calculation; if this value uses a different unit, period or definition, convert or restate it first.
Verify activity level before calculation; if this value uses a different unit, period or definition, convert or restate it first.
Verify goal before calculation; if this value uses a different unit, period or definition, convert or restate it first.

Step-by-step check

Enter your weight, height, and age first.
Pick your sex and activity level.
Choose whether you want to lose, maintain, or gain.
Press Calculate to see your daily calorie target.

Worked example and sanity check

As a worked reference for “How many calories intake”, Worked example Maintenance calories = BMR × an activity factor. With a BMR of 1,500 kcal and a 'lightly active' factor of 1.375, daily maintenance is ≈ 2,063 kcal . A moderate 500 kcal deficit (~1,563 kcal) is often used as a starting point for gradual change. Individual needs vary widely — treat this as a rough guide and consult a qualified professional for a personalised plan.

Interpreting the result

The output is only useful against a reference. The example's BMR × an activity factor gives that reference: your own result should be explainable against it — larger or smaller for a reason you can name. Read the magnitude before the decimals: a result ten times too large or small almost always means a unit or period slipped, not that the formula failed.

Reviewed 25 September 2026

Verify any current tax threshold, lender rate, provider rule or health guidance with the authoritative source before acting.

Use the Calorie Calculator

Open Calorie Calculator

Common questions

Which inputs matter most for how many calories intake?

The key inputs are Weight (kg), Activity level. Match their units and periods before using Water Intake Calculator.

How can I check an answer for how many calories intake?

Run the example exactly as written, then vary weight (kg) alone. A result that tracks that change predictably tells you the setup — units, periods, definitions — is correct.

When should I recalculate how many calories intake?

Recalculate whenever any input's basis changes: a new measurement, a revised rate or threshold, a different period convention, or an updated policy figure.