CALCULATOR FLAGSHIP
Free Macro Calculator Online
Macro Calculator turns a calorie target into daily protein, carbohydrate, and fat grams using the Mifflin-St Jeor equation, activity level, and your goal.
Macro Nutrient CalculatorProtein Carb Fat CalculatorIifym CalculatorMacro Split Calculator
Interactive Macro Calculator Workspace
Process your files or inputs directly in your browser. Many workflows run locally; features that need network data or a service are identified on their tool page.
At a glance
Macro Calculator — Macro Calculator turns a calorie target into daily protein, carbohydrate, and fat grams using the Mifflin-St Jeor equation, activity level, and your goal.
Free for the core workflow, no account required. The calculation is performed locally in the browser from the values you enter.
About Macro Calculator
Macro Calculator turns a calorie target into daily protein, carbohydrate, and fat grams using the Mifflin-St Jeor equation, activity level, and your goal.
BMR comes from age, sex, height, and weight; TDEE multiplies by activity; the goal adjusts up or down. Protein is set per kilogram of body weight, fat as a share of calories, and carbs fill the remainder. Results include a macro split bar and per-meal grams for 3, 4, or 5 meals a day. Calculator results depend on the inputs, units, assumptions, formulas and reference date or rate where applicable. Confirm units and assumptions, compare the result with a known example when possible, and verify current external rates or rules.
Primary objective: Convert a calorie target into daily protein, carbohydrate, and fat grams using Mifflin-St Jeor BMR, activity level, and goal.
Privacy assurance: The calculation is performed locally in the browser from the values you enter.
How to Use Macro Calculator
- Enter age, sex, height, weight, and activity level.
- Choose a goal and set protein per kg and fat percentage.
- Review BMR, TDEE, target calories, macro grams, and per-meal splits.
- Define the result you need from Macro Calculator before choosing options or entering data.
- Use a small representative input for the first run so you can confirm that the settings match the intended macro calculator workflow.
- Review the result against the original input or expected format before copying, downloading, publishing or sharing it.
Key Use Cases & Applications
- Cutting and bulking macros
- Meal-prep gram targets
- Sports nutrition planning
- Use Macro Calculator for estimating a value from known inputs.
- Use Macro Calculator for comparing scenarios before making a decision.
- Use Macro Calculator for checking a calculation without installing dedicated software.
Frequently Asked Questions
What is TDEE?
Total Daily Energy Expenditure — BMR plus calories burned through activity and exercise.
How much protein do I need?
Common evidence-based ranges are 1.6–2.2 g per kg for active people; the calculator lets you set your own target.
Should carbs or fat fill the rest?
After protein, the split is largely preference and adherence — the calculator defaults fat to 25% of calories.
Do I need to hit macros exactly every day?
No. Weekly averages matter more than daily perfection — consistency across weeks drives results, not hitting 152g vs 150g on a Tuesday.
What should I check before using the Macro Calculator result?
Confirm units and assumptions, compare the result with a known example when possible, and verify current external rates or rules. The result is a mathematical model based on the supplied inputs and assumptions.
Does Macro Calculator replace a professional or authoritative source?
No. Macro Calculator is a practical utility. Where the result affects a regulated, financial, medical, legal or business decision, verify it against the appropriate authoritative source or qualified professional.