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Calorie Calculator

Calculate your daily calorie needs and macro split using the Mifflin-St Jeor formula.

Mifflin-St JeorMacros Included
calories per day

About this tool

Calculate your daily calorie needs and macro split using the Mifflin-St Jeor formula.

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About this tool

Calculate your daily calorie needs and macro split using the Mifflin-St Jeor formula. MyCalcTools calculators are designed for quick everyday estimates with clear inputs, instant results and no account required. Results are provided for general information and planning, not as professional financial, medical, legal or trade advice.

How to use it

  1. Enter the values requested in the calculator fields.
  2. Choose the option that best matches your situation, unit or goal.
  3. Press the calculate button and review the result summary.
  4. Adjust your inputs to compare different scenarios.

Common use cases

  • Checking a quick estimate before making a decision.
  • Comparing two or more everyday scenarios side by side.
  • Planning budgets, meals, projects, dates or personal routines.
  • Double-checking manual calculations with a simple online reference.

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Frequently Asked Questions

Basal Metabolic Rate is the calories your body burns at complete rest. It is the minimum energy needed to keep basic functions running.

This calculator uses the Mifflin-St Jeor equation, the most accurate formula for most adults according to the American Dietetic Association.

Macronutrients are protein, carbohydrates and fat. The macro split shown is a balanced starting point — adjust based on your personal goals.