Protein Intake Calculator
Find out how much protein you need per day based on your goal, body composition, and age. Free, no signup required.
How much protein do you actually need?
There is no single answer. Your optimal protein intake depends on your goal, the size of your caloric deficit or surplus, your training experience, body fat percentage, and age. The RDA of 0.8 g/kg was established for sedentary populations to prevent deficiency — it is not a target for anyone pursuing body composition goals.
Active individuals who resistance train benefit from substantially higher intakes. The research consistently shows that protein needs increase during caloric restriction (to preserve lean mass), decrease slightly during a surplus (when energy is abundant), and increase again with age (due to anabolic resistance). A single recommendation cannot account for all of these variables, which is why this calculator uses six context-specific ranges rather than one generic number.
How we calculate your protein target
6-context protein recommendations
Most protein calculators give one generic range regardless of your situation. This calculator uses six context-specific ranges because protein needs vary significantly based on your goal and the size of your caloric deficit. Someone aggressively cutting body fat needs substantially more protein than someone maintaining their weight — the research is clear on this.
| Context | Protein (g/kg/day) |
|---|---|
| Fat loss — aggressive | 2.3 – 2.7 |
| Fat loss — moderate | 2.0 – 2.4 |
| Fat loss — steady | 1.8 – 2.2 |
| Muscle gain | 1.6 – 2.2 |
| Body recomposition | 2.0 – 2.4 |
| Maintenance | 1.4 – 1.8 |
Morton, RW 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, 52(6), 376–384.
Helms, ER et al. (2014). A systematic review of dietary protein during caloric restriction in resistance trained lean athletes. International Journal of Sport Nutrition and Exercise Metabolism, 24(2), 127–138.
Why aggressive cuts need more protein
Larger caloric deficits increase the risk of muscle loss. The body turns to amino acids for energy when carbohydrate and fat availability are low, and the deeper the deficit, the greater this effect. Higher protein intake (2.3–2.7 g/kg) during aggressive cuts helps preserve lean mass by maintaining a positive muscle protein balance even under severe energy restriction.
Helms et al. (2014) recommended 2.3–3.1 g/kg of lean body mass for natural bodybuilders in contest preparation — a context with extreme caloric restriction where muscle preservation is critical. This calculator applies urgency-specific ranges that scale protein upward as deficit size increases.
The lean body mass approach
When body fat percentage is known, protein can be calculated per kilogram of lean body mass (LBM) rather than total body weight. This is more accurate at the extremes of body composition: individuals with very high body fat get an inflated target when using total weight, while very lean individuals may need more protein relative to their total weight to protect their muscle mass.
This calculator shows both approaches when body fat is provided and the goal is fat loss, so you can compare and choose the target that fits your situation.
How to distribute protein across meals
Each meal should contain at least 25g of protein to reach the leucine threshold needed to maximally stimulate muscle protein synthesis. There is no meaningful additional benefit beyond approximately 55g per meal — excess protein at a single sitting does not produce proportionally more muscle growth.
Distributing protein relatively evenly across 3–5 meals is more effective for total daily muscle protein synthesis than front-loading breakfast or back-loading dinner. If your daily target exceeds 200g and you eat fewer than four meals per day, a protein supplement between meals can help bridge the gap without requiring impractically large portions.
Protein needs for older adults
Adults over 65 experience anabolic resistance — a reduced sensitivity to protein's muscle-building signal. The same dose of protein that triggers robust muscle protein synthesis in a 25-year-old produces a blunted response in a 65-year-old. This means older adults need more protein per meal and more protein per day to achieve the same anabolic effect.
Research supports a minimum of 1.6 g/kg for older adults engaged in resistance training, increasing up to 2.0 g/kg during caloric restriction. This calculator automatically adjusts the floor upward for users aged 65 and over, regardless of their selected goal.
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