Best macro ratio for fat loss
When cutting calories, the most important macro to protect is protein. Higher protein intake during a deficit preserves muscle mass and increases satiety — both critical for sustainable fat loss.
The macro distribution this calculator uses for a cut:
- Protein: ~40% of calories (approximately 2.2–2.4 g/kg bodyweight) — maximum muscle preservation
- Carbs: ~35% of calories — enough to fuel workouts and maintain performance
- Fat: ~25% of calories — minimum for hormonal health (never drop fat below 0.5 g/lb)
Example: Male, 32 years old, 80 kg, 178 cm, moderately active — Cut (−500 kcal)
TDEE2,723 kcal
Cut target2,223 kcal/day
Protein (40%)192 g/day (768 kcal)
Carbs (35%)194 g/day (778 kcal)
Fat (25%)75 g/day (675 kcal)
Expected fat loss rate~1 lb (0.45 kg)/week
Example: Female, 28 years old, 65 kg, 165 cm, lightly active — Cut (−500 kcal)
TDEE1,898 kcal
Cut target1,398 kcal/day
Protein (40%)140 g/day (559 kcal)
Carbs (35%)122 g/day (489 kcal)
Fat (25%)39 g/day (350 kcal)
Best macro ratio for muscle gain
Building muscle requires a calorie surplus (lean bulk: +200–350 kcal above TDEE) and sufficient protein to support muscle protein synthesis. Carbohydrates are the primary fuel for resistance training — higher carb intake on a bulk directly supports workout performance and recovery.
The macro distribution for a lean bulk:
- Protein: ~30% of calories (approximately 1.8–2.2 g/kg bodyweight)
- Carbs: ~45% of calories — high carbs to fuel training and promote glycogen storage
- Fat: ~25% of calories — supports testosterone production and joint health
A lean bulk adds approximately 0.25–0.5 lbs of muscle per week for a natural trainee — with minimal concurrent fat gain when calories are managed carefully.
Common macro tracking mistakes
The 5 most common macro errors
1Tracking calories but ignoring protein. Total calorie intake controls whether you gain or lose weight, but protein controls whether that weight is muscle or fat. Many people hit their calorie target while under-eating protein and wonder why they lose strength on a cut.
2Cutting dietary fat too low. Fat below 0.3 g/lb bodyweight suppresses testosterone and oestrogen production. A common sign: mood crashes, low libido, joint pain. Fat should stay at 20–25% of calories even in aggressive cuts.
3Needing daily perfection. Research shows weekly average macros matter more than daily precision. Being within 10–15% of targets consistently over a week produces essentially identical outcomes to hitting exact numbers daily. Flexibility prevents diet fatigue.
4Not accounting for cooking methods. "100g chicken breast" raw vs cooked differs by 20–30% in weight due to water loss. Always log raw weights or use cooked-specific database entries consistently.
5Ignoring protein on rest days. Muscle protein synthesis is elevated for 24–48 hours after training. Hitting protein targets on rest days is just as important as on training days for recovery and growth.
Practical tools for tracking macros
The most accurate method is weighing food on a digital kitchen scale and logging in an app. Cronometer is the most accurate free database for micronutrients. MyFitnessPal has the largest food database for convenience. Both sync with most fitness wearables.
The 80% rule: being accurate 80% of the time consistently produces better long-term results than being 100% accurate for two weeks then quitting. Start with just tracking protein — once that is automatic, add carbs and fat.
Frequently asked questions about macros
What are macros and why do they matter?
Macros are protein, carbohydrates, and fat — the three nutrients that provide all dietary calories. Total calorie intake determines whether you gain, maintain, or lose weight. Macro distribution determines whether that weight change comes from fat or muscle. You can lose weight eating any ratio of macros, but the ratio determines your body composition outcome.
Should I track macros or just calories?
Tracking calories alone is sufficient for weight change. Tracking macros is necessary for body composition — especially important when minimising muscle loss on a cut, or maximising lean gains on a bulk. At minimum, track protein daily and let carbs and fat fill remaining calories to preference.
What is the best macro ratio for weight loss?
No single "best" ratio exists — weight loss is determined by total calorie deficit. However, higher protein (35–40% of calories) consistently outperforms lower protein for preserving muscle during fat loss. A practical starting point: 40% protein, 35% carbs, 25% fat. Adjust carbs and fat to food preference once protein is set.
Do I need to hit my macros exactly every day?
No. Being within 10–15% of targets consistently across a week produces essentially the same physiological outcome as hitting exact numbers every day. Daily precision matters less than weekly consistency. Prioritise protein — it has the least flexibility. Carbs and fat can vary substantially day to day without meaningfully affecting results.
How much protein do I need per day?
For active individuals, 1.6–2.2 g/kg bodyweight per day is supported by research for muscle retention and growth. During a calorie deficit, go toward the higher end (2.2–2.4 g/kg) to counteract muscle breakdown. Sedentary adults need approximately 0.8 g/kg for basic health. Use the
protein calculator for personalised targets.
Related free calculators
Results are estimates based on validated formulas. Not medical advice.