CalculatorX

Weight loss; Restricted diets; Reference

Calorie Intake Calculator

Calorie Intake Calculator estimates resting calories with the Mifflin-St Jeor formula, not a meal plan. BMR = 10×kg + 6.25×cm − 5×age, then +5 for male or −161 for female. Activity, muscle, and illness move the real need. The page stops at the resting estimate.

Calorie Intake Calculator estimates resting calories with the Mifflin-St Jeor formula, not a meal plan. BMR = 10×kg + 6.25×cm − 5×age, then +5 for male or −161 for female. Activity, muscle, and illness move the real need. The page stops at the resting estimate.

Reviewed 2026-11-08. The result is an educational estimate, not professional advice.

Enter your values

This calculation stays in your browser. Nothing is sent when you press Calculate.

Result

Enter values to calculate.

Formula

BMR = 10×kg + 6.25×cm − 5×age + 5 for male, or − 161 for female.

Example

The result is an estimate of resting calories, not a prescription.

Illustration for the Calorie Calculator used by CalculatorX.
Illustration only. Use the formula and the result box for the number.

How to use Calorie Intake Calculator

Enter kilograms, centimetres, age, and the sex the formula asks for. Read kcal per day as a starting point for a conversation, not a target to hit.

The formula that actually runs is: BMR = 10×kg + 6.25×cm − 5×age + 5 for male, or − 161 for female.

The result is an estimate of resting calories, not a prescription.

Where this estimate stops

Do not cut food or change medicine from this number. A clinician or a dietitian should do that with you.

The calculation stays in your browser. CalculatorX does not save the numbers as an account.

If you need a different figure, look at Calorie Calculator, Calories Calculator, TDEE Calculator, Maintenance Calories Calculator.

How to use this calculator

  1. Start with the numbers you already have. Enter kilograms, centimetres, age, and the sex the formula asks for. Read kcal per day as a starting point for a conversation, not a target to hit.
  2. Press Calculate. The result uses only the fields on this form and the formula printed under it.
  3. Read the limit. Do not cut food or change medicine from this number. A clinician or a dietitian should do that with you.

Questions about Calorie Intake Calculator

How does Calorie Intake Calculator get its result?

Enter kilograms, centimetres, age, and the sex the formula asks for. Read kcal per day as a starting point for a conversation, not a target to hit.

What formula is on the calorie intake calculator page?

BMR = 10×kg + 6.25×cm − 5×age + 5 for male, or − 161 for female.

Can I trust “calorie intake calculator” as a final decision?

Do not cut food or change medicine from this number. A clinician or a dietitian should do that with you.

Is this stored or sent anywhere?

No. The page calculates in your browser and does not create an account.

What this helps you do

  • Estimate Calorie Intake from the inputs you already have.
  • Check the result against the formula and the worked example.
  • Change one value at a time and compare the new estimate.

Limits to keep in mind

  • The figure is only as complete as the inputs on this form.
  • Rounding, fees, and local rules can change the real-world number.
  • Use it to learn and compare. Confirm important finance or health decisions with a qualified professional.