Macro Calculator

Calculate your ideal daily macronutrient split — protein, carbs, and fat — based on your calorie target and fitness goal.

About Macro Calculator

Macronutrients — protein, carbohydrates, and fat — are the three main sources of calories in your diet. Getting the right balance helps you reach your fitness and health goals more effectively. This calculator adjusts your macro split based on your goal (weight loss, maintenance, muscle gain, or keto) and your protein preference, then provides exact gram targets for each nutrient.

Goal-Based Splits

Different goals need different ratios: higher protein for muscle gain, higher fat for keto, higher carbs for maintenance energy.

Protein Per Body Weight

Protein needs scale with body weight. Muscle gain recommends 1.6-2.2 g/kg, while maintenance targets 1.2-1.6 g/kg.

Calorie Sources

See calories from each macronutrient: 4 cal/g for protein and carbs, 9 cal/g for fat.

Keto Option

Keto mode uses 70% fat, 25% protein, and only 5% carbs — keeping you in ketosis while meeting your calorie target.

📋 Common Use Cases

Track Your Health Progress

Monitor changes in your health metrics over weeks and months. Regular tracking helps you see trends, stay motivated, and adjust your fitness or nutrition plan based on real data.

Set Realistic Fitness Goals

Use your calculated metrics to set achievable weight, nutrition, and fitness targets. Understand your baseline numbers before starting any new diet or exercise program.

Professional Health Assessment

Healthcare professionals, personal trainers, and coaches can quickly compute client metrics during consultations without accessing specialized equipment or software.

Nutrition & Diet Planning

Use your results to plan meal portions, macronutrient targets, and daily calorie budgets. Combine multiple health calculators for a complete wellness picture.

🪜 How to Use This Tool

  1. Enter your body measurements
    Fill in the required fields — typically height, weight, age, and gender. Use the unit toggles if you prefer metric or imperial units.
  2. Add optional details if available
    Some calculators accept additional inputs like activity level, waist circumference, or body fat percentage for more precise results.
  3. Review your calculated metrics
    Your results appear instantly with clear labels and reference ranges. Color-coded indicators show where you fall on standard health classification scales.
  4. Track changes over time
    Bookmark the page and return periodically to recalculate. Comparing results over weeks and months reveals meaningful health trends.

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Frequently Asked Questions

Are these calculators really free?
Yes. All calculators on iluv.tools are completely free. No signup, no account, no credit card required. Every calculation runs instantly in your browser.
Is my data sent anywhere?
Absolutely not. All calculators are pure client-side JavaScript. Your numbers, dates, and inputs never leave your browser. No server processing, no tracking.
How accurate are these calculators?
Calculators use standard mathematical formulas with double-precision floating point. Results match industry-standard financial and scientific calculations.
Can I use calculators on mobile?
Yes. All calculators work on mobile browsers (iOS Safari, Android Chrome) with responsive layouts.