Protein Per Meal Calculator
Calculate optimal protein per meal to maximise muscle protein synthesis based on bodyweight.
How to use this tool
- Enter body weight and meals per day in the fields above.
- Results update instantly as you type — or click Calculate.
- Read your protein per meal and the full breakdown beneath it.
Research suggests that ~0.4 g of protein per kg of body weight per meal maximises muscle protein synthesis (MPS), with diminishing returns above ~40–50 g per sitting. Spreading protein across 3–5 meals is more effective than eating it all in one or two sittings. For education only — individual needs vary.
Formula
Protein per meal (g) = round(body weight (kg) × 0.4)
Daily protein total (g) = protein per meal × meals per day
Estimated leucine per meal (g) = protein per meal × 0.09
How it works
This calculator uses the research-derived threshold of approximately 0.4 g of protein per kg of body weight per meal, which studies on muscle protein synthesis (MPS) suggest is close to the dose needed to maximally stimulate MPS in most individuals. Spreading this dose across multiple meals aims to keep MPS elevated throughout the day rather than consuming protein in one or two large boluses.
The leucine estimate (9% of protein) is based on average leucine content in high-quality animal and plant protein sources; leucine is the primary amino acid responsible for triggering MPS. Individual needs can vary with age (older adults may require higher doses), training status, and protein source quality.
Worked example
Worked example
- A 75 kg person eats 4 meals per day.
- Protein per meal: round(75 × 0.4) = round(30) = 30 g.
- Daily total: 30 g × 4 meals = 120 g.
- Leucine per meal: 30 × 0.09 = 2.7 g.
30 g protein per meal; 120 g daily total; ~2.7 g leucine per meal
Key terms
- Muscle protein synthesis (MPS)
- The cellular process of building new muscle protein from amino acids; it is stimulated by resistance exercise and dietary protein, particularly leucine.
- Leucine
- A branched-chain essential amino acid that acts as the primary molecular trigger for MPS; a meal containing ~2–3 g of leucine is generally sufficient to maximally activate this pathway.
- Protein distribution
- The pattern of protein intake across meals throughout the day; evidence suggests that spreading protein evenly across 3–5 meals produces greater 24-hour MPS than skewing intake toward one meal.
- Essential amino acids (EAAs)
- The nine amino acids the body cannot synthesise and must obtain from food; protein sources rich in EAAs (meat, eggs, dairy, soy) are considered higher quality for MPS.
- Per-meal protein threshold
- Approximately 0.4 g per kg body mass per meal beyond which additional protein in a single sitting does not further increase acute MPS, though it may contribute to other protein-related physiological needs.
Frequently asked questions
- Why does leucine matter?
- Leucine is the branched-chain amino acid (BCAA) that acts as the primary trigger for muscle protein synthesis. You need approximately 2–3 g of leucine per meal to activate MPS, which corresponds to roughly 25–35 g of high-quality protein.
- Is more protein per meal wasted?
- Not necessarily — excess amino acids are used for energy or other processes. However, the marginal benefit to muscle building from additional protein per meal plateaus after ~40–50 g for most people.