Best Free Macro Calculator
No Signup Required
Calculate your ideal protein, carbs, and fats for weight loss, muscle gain, or maintenance. Works instantly in browser with no account needed.
What Are Macros?
Macronutrients (macros) are the three main nutrients your body needs in large amounts:
Protein
4 calories per gram
Builds muscle, repairs tissue, supports immune function
Carbs
4 calories per gram
Primary energy source for workouts and brain function
Fats
9 calories per gram
Hormone production, nutrient absorption, brain health
Methodology & Credibility
Author: Nutrition-Reviewed AI System
Formula: Mifflin-St Jeor Equation for TDEE, adjusted for protein/carb/fat ratios by goal
Sources: NIH, USDA Dietary Guidelines, American College of Sports Medicine
Disclaimer: Macro calculations are estimates. Consult registered dietitians for personalized plans.
FAQs
Is this macro calculator free?
Yes, completely free with no signup or account required. Use it unlimited times.
How do I calculate macros for weight loss?
Select "weight loss" as your goal. The calculator will set a calorie deficit and optimize protein to preserve muscle while losing fat.
What's the best macro ratio?
It depends on your goal. Weight loss: high protein, moderate carbs. Muscle gain: high protein, higher carbs. The calculator adjusts automatically.
This is not medical advice — talk to your doctor. The sections below are educational only. Macro targets are estimates based on standard formulas; actual needs vary with body composition, health status, and activity. Anyone with a medical condition should consult a doctor or registered dietitian.
Why a No-Sign-Up Macro Calculator Matters
Most macro calculators ask for your email before showing the result, then store your inputs on a server and add you to a marketing list. That trade is not necessary for a math estimate. This page works differently:
- No account: No email, no password, no profile. You arrive, calculate, and leave.
- No tracking: Your inputs are not saved to a database tied to you. Nothing follows you across visits.
- Your data stays in your browser: The math runs on your device. The result is yours and is not sent anywhere.
- Free, unlimited: Use it as often as you like. No paywall, no trial, no hidden fee.
A macro target is a number, not a product. Putting it behind an account adds friction without adding value. This page keeps the estimate free, private, and instant.
The Macro Formula Chain (No Sign-Up to See)
The tool above runs a four-step chain. Nothing is hidden behind an account:
- BMR via Mifflin-St Jeor (10 × wt kg + 6.25 × ht cm − 5 × age + 5 for men, − 161 for women).
- TDEE = BMR × activity factor (1.2 to 1.9).
- Calorie target = TDEE adjusted for goal (−500 for loss, +300 for gain).
- Macros = target calories split across protein/carbs/fat (4, 4, 9 cal/g).
For the full macro theory guide, see the Macro Calculator page.
Macro Splits by Goal
Pick a split that matches your goal, then let the tool convert it to grams for free:
| Goal | Protein | Carbs | Fat | Why |
|---|---|---|---|---|
| Weight loss | 40% | 30% | 30% | High protein preserves muscle in a deficit |
| Maintenance | 30% | 40% | 30% | Balanced for stable weight |
| Muscle gain | 30% | 50% | 20% | More carbs fuel training |
| Keto | 25% | 5% | 70% | Very low carb, high fat |
Worked Example (Free, Private)
A 30-year-old man, 180 cm, 80 kg, moderately active, aiming for weight loss:
- BMR = 10 × 80 + 6.25 × 180 − 5 × 30 + 5 = 800 + 1125 − 150 + 5 = 1,780 cal
- TDEE = 1,780 × 1.55 ≈ 2,759 cal
- Weight-loss target = 2,759 − 500 = 2,259 cal
- 40/30/30 split → 904 cal protein (226 g), 678 cal carbs (169 g), 678 cal fat (75 g)
That is the full chain, free and with no account. Run your own numbers in the tool above.
How to Track Your Macros (No Account Needed)
Once you have your targets from the free tool above, track them with tools that do not require an account:
- Paper notebook: Write each food and its protein, carbs, fat, and total at each meal.
- Spreadsheet: List foods in rows, macros in columns, and sum to your daily target.
- Food labels: Use the nutrition facts panel for packaged foods.
- USDA FoodData Central: A free public database for whole foods without an account.
For a protein-specific target, see the Protein Calculator. For the calorie burn behind your macros, see the TDEE Calculator.