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Macro Calculator

Daily carbs, protein and fat for any goal and split.

Losing weightStep 3 of 5

Best for: Use it when calorie-counting isn't enough \u2014 to preserve muscle, fuel training, or follow a low-carb/keto split.

Complete guide
See benchmark ranges Why this result happened View assumptions
Country (units):

Input

How it's calculated & sources
The Macro Calculator uses the standard formula for this calculation. It runs entirely in your browser, so your inputs are never uploaded. Figures are educational estimates, not professional advice — verify important decisions with a qualified expert. Last reviewed June 2026.
Key assumptions
  • 4/4/9 kcal per gram (protein/carbs/fat)
  • Ratio as chosen

Educational estimate only — not medical advice. Consult a qualified healthcare professional for decisions about your health.

Free & no sign-up · runs entirely in your browser. Results are estimates for general information, not professional advice — verify important decisions with a qualified expert. Last reviewed June 2026.

How it works

Carbs/Protein: 4 kcal/g · Fat: 9 kcal/g

Grams = (calories × ratio) / kcal-per-gram

Example

2,200 kcal balanced (40C/30P/30F) = 220g carbs · 165g protein · 73g fat.

Frequently asked questions

Which macro split is best?+

Depends on goals. Higher protein helps muscle retention; lower carb suits some endurance and weight-loss plans.

Do I need to hit macros exactly?+

Within ~10% is fine. Consistency matters more than precision.

Continue your journey

Where people usually head next.

🔥
BMR Calculator
Basal metabolic rate using the Mifflin-St Jeor formula.
⚡
TDEE Calculator
Total Daily Energy Expenditure for any activity level.
🍎
Calorie Calculator
Daily calories to lose, maintain or gain weight.
🧍
Body Fat Calculator
U.S. Navy method body fat percentage from circumferences.

Complete guide

Quick answers

Short, sourced answers to the questions people (and AI assistants) ask most.

What is Macro?
A macro calculator splits your daily calories into grams of protein, carbohydrates and fat \u2014 the 'macros' that shape body composition, not just weight.
Why does Macro matter?
Eating above or below your maintenance drives weight gain or loss.
How is Macro calculated?
It takes your calorie target and a chosen ratio, then converts each macro's share of calories into grams using their energy density. Formula: Protein 4 kcal/g \u00b7 Carbs 4 kcal/g \u00b7 Fat 9 kcal/g.
What is a good macro?
~1.6-2.2 g/kg/day for active people
What are common macro mistakes?
Needs rise with training
When should you use the Macro Calculator?
Use it when calorie-counting isn't enough \u2014 to preserve muscle, fuel training, or follow a low-carb/keto split.

What is the Macro Calculator?

A macro calculator splits your daily calories into grams of protein, carbohydrates and fat \u2014 the 'macros' that shape body composition, not just weight.

How the Macro Calculator works

It takes your calorie target and a chosen ratio, then converts each macro's share of calories into grams using their energy density.

Protein 4 kcal/g \u00b7 Carbs 4 kcal/g \u00b7 Fat 9 kcal/g
  • calories — Your daily target
  • ratio — % split across protein/carbs/fat
  1. Enter your calories — a unit of food energy; here, your daily intake or target.
  2. Enter your weight — your body weight, entered in kilograms or pounds.
  3. Read the result, then change any input to compare scenarios instantly — the Macro Calculator recalculates as you type.

Understanding the inputs

What each value means, why it matters, and a typical range — so you can fill in the calculator with confidence.

Calories

A unit of food energy; here, your daily intake or target.

Why it matters:
Eating above or below your maintenance drives weight gain or loss.
Typical range:
Roughly 1,600 to 2,400 per day for many adults, varying with size and activity.
How it affects results:
  • Higher: A surplus that tends to cause weight gain.
  • Lower: A deficit that tends to cause weight loss.

Common mistake: Eating at your resting (BMR) number instead of your full daily burn (TDEE).

Weight

Your body weight, entered in kilograms or pounds.

Why it matters:
It feeds BMI, calorie, body-fat and dosing calculations.
Typical range:
Varies by person; tools accept metric or imperial.
How it affects results:
  • Higher: Raises BMI and calorie needs.
  • Lower: Lowers BMI and calorie needs.

Common mistake: Mixing units - entering pounds where kilograms are expected.

Benchmark reference

What counts as poor, average or excellent for this metric.

Protein Intake

Average1.6-2.2 g/kg/day

Source: Sports-nutrition consensus ranges · Updated June 2026

Typical values

Protein Intake:
~1.6-2.2 g/kg/day for active people

Common interpretation errors

  • Needs rise with training
  • Spread intake across the day

What impacts results most

  1. 1.
    Calorie target (High impact)Total calories are split into the macros.
  2. 2.
    Macro ratio (High impact)Sets the grams of protein, carbs and fat.
  3. 3.
    Body weight (Medium impact)Drives the protein target.

Key assumptions

  • 4/4/9 kcal per gram (protein/carbs/fat)
  • Ratio as chosen

What's a typical value?

For building or keeping muscle, aim for roughly 1.6\u20132.2 g of protein per kg of body weight per day.

Common macro splits (P/C/F)

Balanced30% / 40% / 30%
High-protein40% / 30% / 30%
Low-carb40% / 20% / 40%
Keto25% / 5% / 70%

Worked example

Inputs: 2,200 kcal, balanced 40/30/30 split Calculation: carbs & protein 4 kcal/g, fat 9 kcal/g Result: 220 g carbs · 165 g protein · 73 g fat What it means: Hitting protein is the priority for keeping muscle in a deficit.

Compared to alternatives

Calories vs Macros

Total energy versus how it's split.

CaloriesMacros
ControlsWeight up/downBody composition
OrderSet the target firstThen split it
PriorityCalorie balanceProtein

Bottom line: Calories decide weight; macros (especially protein) decide what that weight is made of.

Calories calculator·Macros calculator

Related concepts

How Macros connects to the concepts around it.

Calories:
Daily food energy for losing, keeping or gaining weight.
Protein:
The daily protein needed to build or keep muscle.
TDEE:
Total calories burned in a day, including activity.

Reviewed sources & methodology

Methodology: Professional Estimate · Last reviewed June 2026.

Keywords: macros, protein, carbs, fat.

This tool is for general information only and is not medical advice. Consult a qualified healthcare professional for decisions about your health.

Reviewed by the Free Tools Galaxy editorial team · Updated June 2026 · Calculated privately in your browser.

Frequently asked questions

Is the Macro Calculator free to use?+

Yes. Every tool on Free Tools Galaxy is 100% free, runs in your browser and requires no signup.

How accurate is the Macro Calculator?+

Macro Calculator uses the standard macro formula in double-precision arithmetic, so the same inputs always produce the same result and you can verify any figure by hand. It is an educational estimate — real-world outcomes depend on your actual rates, rules and assumptions.

Do you store my inputs?+

No. The Macro Calculator runs entirely in your browser. Nothing is uploaded or saved to a server.

Can I use the Macro Calculator on mobile?+

Yes — the interface is fully responsive and works on phones, tablets and desktops.

What are common mistakes to avoid?+

The most frequent mistake is mixing units. Double-check your inputs use a single, consistent unit before clicking Calculate.

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Part of a workflow

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Daily carbs, protein and fat for any goal and split.

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