How the Macro Calculator Works
Macronutrients — protein, fat, and carbohydrates — are the three nutrients your body needs in large amounts. Each one contains a fixed number of calories per gram:
Carbohydrates = 4 calories per gram
Fat = 9 calories per gram
This calculator takes your daily calorie target, splits it by your chosen percentages, and converts each to grams. Carbs are calculated last as the remainder, which ensures the total always adds up.
Which Split Should I Use?
Balanced (30/25/45) — A solid default for most people. Adequate protein for muscle retention, sufficient fat for hormonal health, and enough carbs to fuel training.
High Protein (40/25/35) — Best during a cut. Higher protein increases satiety and protects muscle mass during a calorie deficit.
Low Fat (35/20/45) — Keeps fat at the minimum healthy threshold while maximizing carbs for performance. Common among endurance athletes and high-volume trainers.
Low Carb (35/40/25) — Higher fat, lower carb. Some people find this improves energy stability and reduces hunger. Can impair performance in glycolytic sports.
Keto (20/70/10) — Very high fat, very low carb. Induces ketosis. Not recommended for most strength athletes due to reduced high-intensity performance, but some people prefer it for body composition goals.
How Much Protein Do I Need?
Research supports 0.7-1g per pound of bodyweight (1.6-2.2g/kg) for people who train with weights. During a cut, aim for the higher end. During a bulk or maintenance, 0.8g/lb is typically sufficient. The calculator shows your per-pound intake so you can check against these benchmarks.
Does the Macro Ratio Really Matter?
Total calories determine whether you gain or lose weight. Protein adequacy determines how much of that change is muscle vs. fat. Beyond hitting a protein minimum and a fat minimum (around 20-25% of calories), the split between carbs and fat is largely personal preference. Pick whichever ratio you can sustain consistently.