How to calculate macros for muscle gain

There is no single magic macro split. But there is a robust starting formula — and a way to tune it from your weekly weight trend.

Step 1 — Set your calories

Estimate maintenance with a validated equation or the AJYX TDEE calculator, then calibrate against a real multi-week body-weight trend. For muscle gain, a modest surplus can be a starting point; the appropriate size depends on training status, goal and observed rate of gain.

Step 2 — Lock in protein

Resistance-training research supports about 1.6 g/kg/day as a useful population-level reference point for many adults, with individual needs and goals varying. Higher intakes can be appropriate in some contexts, but they should not be presented as a universal requirement.

Step 3 — Set fat

Set dietary fat high enough to support an adequate, sustainable diet instead of using a universal body-weight floor. The remaining energy can then be allocated between carbohydrate and fat according to preferences and training demands.

Step 4 — Carbs are the rest

After protein and an appropriate fat intake are set, carbohydrate can fill much of the remaining energy budget. Training volume, sport demands, food preference and total calories determine the useful amount.

Step 5 — Adjust on weekly weight

Use repeated body-weight observations under similar conditions and compare trends over multiple weeks. Adjust calories gradually when the trend does not match the goal instead of reacting to one weigh-in.

How AJYX tools support this

AJYX provides calorie, macro and protein tools and can use recorded nutrition, body measurements and training context in its coaching. Calculator outputs are estimates and should be checked against real-world trends.

Evidence and calculator limits

Resting-energy equations are estimates, not direct measurements of individual maintenance. Source: Mifflin et al. — https://pubmed.ncbi.nlm.nih.gov/2305711/

Protein supplementation and resistance-training meta-analysis: Morton et al. — https://pubmed.ncbi.nlm.nih.gov/28698222/

Use /tools/tdee-calculator, /tools/protein-calculator and /tools/macro-calculator as starting estimates, then calibrate against observed trends.