Protein Intake Calculator — Daily Protein Target by Goal

How to use this calculator

Enter your bodyweight (kg or lb), select your goal — fat loss, muscle gain, or maintenance — and choose how many meals you eat per day (3, 4, or 5). The calculator returns three output cards: your daily protein target as a range in grams, the calories from protein that range contributes to your intake, and your per-meal protein target at your chosen meal frequency. All values are displayed as ranges reflecting the evidence-based spread for each goal.

How to interpret your results

Fat loss: 1.6–2.4 g/kg/day

When you are eating below maintenance, protein does three jobs simultaneously: it preserves lean muscle that would otherwise be lost alongside fat, it increases thermogenesis (protein requires more energy to digest than carbohydrate or fat), and it reduces hunger via satiety hormones. The upper end of this range — 2.4 g/kg — is supported by Stokes et al. (2018) [1], who reviewed protein requirements specifically in energy-restricted states and found that intakes at the higher end of the range produced better muscle retention. A calorie deficit without adequate protein is a diet that burns both fat and muscle; protein at this range tips the balance toward fat.

The higher ceiling for fat loss compared to muscle gain reflects a protective role: in a deficit, amino acid oxidation increases, and more dietary protein is needed to meet both maintenance and preservation needs. This is why protein needs are often higher when eating less, not lower.

Protein intake for muscle gain — 1.6–2.2 g/kg/day

For individuals in a surplus who are training consistently, 1.6–2.2 g/kg covers the needs of the vast majority. Morton et al. (2018) [2] conducted a meta-analysis of 49 randomised controlled trials and found that protein intakes beyond approximately 1.62 g/kg produced no additional muscle gain at the group level, though individual response varies. The 2.2 g/kg ceiling marks the upper boundary where benefit is reliably observed across studies. Intakes above this threshold are not harmful but add dietary burden without evidence of further muscle gain.

When using this protein intake calculator for muscle gain, target the middle of the range — around 1.8–2.0 g/kg — if you are training 3–5 days per week. This gives you meaningful room above the minimum effective dose without pushing toward intakes that carry no additional benefit.

Maintenance: 1.2–1.6 g/kg/day

For individuals not actively changing body composition, 1.2–1.6 g/kg is sufficient to preserve muscle and support recovery from moderate physical activity. Helms et al. (2014) [3] found that resistance-trained individuals benefit from targeting the upper end of this range to support ongoing training adaptation. Sedentary adults may maintain on even less, but 1.2 g/kg provides a meaningful buffer against age-related muscle loss (sarcopenia), which begins gradually from the early 30s.

Why protein distribution across meals matters

The per-meal target reflects more than convenience — it relates directly to muscle protein synthesis (MPS), the cellular process that builds and repairs muscle tissue. Schoenfeld and Aragon (2018) [5] found that distributing protein across 3–5 meals optimises MPS throughout the day by repeatedly stimulating leucine-sensitive anabolic signalling pathways. A single large protein bolus does not produce the same sustained anabolic response as multiple moderate doses spaced across the day — the signal is stronger but shorter-lived. The practical recommendation is to include a meaningful protein source (roughly your per-meal target) at each sitting.

Bodyweight versus lean body mass

This calculator uses total bodyweight as the denominator. For individuals who carry significant body fat, total bodyweight can overestimate actual protein needs slightly — lean body mass (LBM) provides a more precise basis for calculation. Jäger et al. (2017) [4] note in the ISSN position stand that LBM-based calculations are preferable for populations at the extremes of body composition. A Lean Body Mass Calculator is in development as Tool 4 on NoGymLab; once live, it will allow you to refine your protein target using LBM rather than total weight.

Safety note

No upper limit for protein that causes organ harm in healthy adults has been established at intakes below 3.5 g/kg. This calculator does not recommend targets above 2.4 g/kg (the evidence-based ceiling for fat loss). Targets above 3 g/kg are outside the scope of population-level research reviewed here and should not be pursued without lean body mass data and ideally input from a registered dietitian.

Frequently asked questions

How much protein do I need per day?

It depends on your goal and bodyweight. For fat loss, evidence supports 1.6–2.4 g per kg of body weight per day to preserve muscle while in a calorie deficit. For muscle gain, 1.6–2.2 g/kg covers the needs of most people training consistently. For maintenance without active recomposition, 1.2–1.6 g/kg is sufficient. A 75 kg person aiming for fat loss would therefore target approximately 120–180 g of protein daily.

How is my protein target calculated?

The calculator multiplies your body weight in kilograms by the lower and upper bounds of the evidence-based range for your selected goal. Goal ranges are drawn from the ISSN position stand (Jäger et al., 2017) and meta-analyses of randomised controlled trials. The result is a daily protein window rather than a single number, because individual response to protein intake varies and a range better captures the uncertainty in population-level research.

Is more protein always better for fat loss?

No — there is a ceiling beyond which additional protein provides no measurable benefit. Morton et al. (2018) found that muscle retention benefits plateau above approximately 1.6–2.4 g/kg in most individuals. Very high intakes (above 3 g/kg) displace calories that could come from carbohydrate and fat, which can impair training performance. The calculator caps recommendations at 2.4 g/kg for fat loss precisely because there is no evidence that higher intakes produce better outcomes, and they come at the cost of dietary flexibility.

Do I need more protein if I train without a gym?

The evidence-based ranges apply to any form of resistance training that creates sufficient mechanical load — bodyweight training, resistance bands, calisthenics, and loaded carries all qualify. What matters is whether your training provides a stimulus for muscle protein synthesis, not where it occurs. If your training involves only low-load aerobic activity with no resistance component, the maintenance range of 1.2–1.6 g/kg is appropriate.

Should I split my protein intake across meals?

Yes, for most people distributing protein across 3–5 meals produces better muscle protein synthesis than eating the same total in one or two sittings. Schoenfeld and Aragon (2018) found that regular protein doses spaced throughout the day repeatedly stimulate leucine-sensitive anabolic pathways that a single large bolus cannot sustain. The per-meal target shown by this calculator is designed to make that distribution practical.

What happens if I eat too little protein in a deficit?

In a calorie deficit, inadequate protein intake shifts the weight-loss composition toward lean mass rather than fat. Your body breaks down muscle tissue to meet amino acid needs for organ function and immune activity. Beyond muscle loss, low protein is associated with increased hunger (protein is the most satiating macronutrient), greater metabolic adaptation, and slower recovery from training. The 1.6 g/kg floor for fat loss is the minimum supported by current evidence for muscle retention during active calorie restriction.

Sources

1. Stokes T, Hector AJ, Morton RW, McGlory C, Phillips SM (2018). Recent perspectives regarding the role of dietary protein for the promotion of muscle hypertrophy with resistance exercise training. Nutrients. PMID 29414855 DOI
2. Morton RW, Murphy KT, McKellar SR, et al. (2018). A systematic review, meta-analysis and meta-regression of the effect of protein supplementation on resistance training-induced gains in muscle mass and strength in healthy adults. British Journal of Sports Medicine. PMID 28698222 DOI
3. Helms ER, Zinn C, Rowlands DS, Brown SR (2014). A systematic review of dietary protein during caloric restriction in resistance trained lean athletes: a case for higher intakes. International Journal of Sport Nutrition and Exercise Metabolism. PMID 24092765 DOI
4. Jäger R, Kerksick CM, Campbell BI, et al. (2017). International Society of Sports Nutrition Position Stand: protein and exercise. Journal of the International Society of Sports Nutrition. PMID 28642676 DOI
5. Schoenfeld BJ, Aragon AA (2018). How much protein can the body use in a single meal for muscle-building? Implications for daily protein distribution. Journal of the International Society of Sports Nutrition. PMID 29497353 DOI