Protein Calculator — Evidence-Based Daily Intake — Calculator

How Protein Calculator Works

Protein (g) = Weight (kg) × g/kg factor | 1 g protein = 4 kcal | Max MPS per meal ≈ 0.4 g/kg

The evidence-based range of 1.6–2.2 g/kg per day comes from the ISSN, ACSM, and international sports nutrition consensus statements. Higher intakes within the range support muscle gain and preservation during calorie deficits. The body has a per-meal ceiling for muscle protein synthesis (MPS) of approximately 0.4 g/kg.

MPS

Muscle Protein Synthesis — The biological process of building new muscle tissue. Stimulated by resistance training and dietary protein. Has a per-meal ceiling of ~0.4 g/kg.

Leucine

Leucine Threshold — The amino acid trigger for MPS. A meal needs ~2–3g of leucine (found in ~25–30g of quality protein) to maximally stimulate MPS.

g/kg

Grams Per Kilogram — The standard unit for protein recommendations. 1.6–2.2 g/kg is the evidence-based range for active individuals. "Grams per pound" (0.73–1.0 g/lb) is the imperial equivalent.

How to Use

1. Enter your weight and unit system.
2. Select your goal — from maintenance to muscle gain.
3. Select your resistance training frequency to fine-tune the target within the evidence-based range.
4. Review your daily target, per-meal breakdown, and food equivalents for practical planning.
5. Use the per-meal breakdown to plan your protein distribution across 3–5 meals for optimal muscle protein synthesis.

Common Uses

• •Muscle building nutrition — use the 1.6-2.2 g/kg range with per-meal distribution (~0.4 g/kg per meal) to maximize muscle protein synthesis throughout the day
• •Fat loss protein planning — set protein targets at the upper end of the range (2.2 g/kg) during calorie restriction to preserve lean mass and increase satiety
• •Post-workout nutrition timing — plan 30-40g protein meals within 2 hours of training, taking advantage of the 4-6 hour anabolic window for optimal recovery
• •Vegetarian and vegan diet planning — ensure adequate plant protein intake with complementary amino acid profiles and higher per-meal targets (~35-40g vs 25-30g animal)

Understanding the Result

The "1 gram per pound of body weight" rule that dominates gym culture is a simplification that overestimates need for most people. The actual evidence-based range is 1.6–2.2 g per kg of body weight (0.73–1.0 g per lb) for most active individuals. Higher intake (up to 2.2 g/kg) is beneficial during calorie restriction (cutting) where protein's thermic effect and satiety are advantageous. The key to muscle growth is not just total daily protein but also its distribution: 3–5 meals with ~0.4 g/kg each maximally stimulate muscle protein synthesis throughout the day. Consuming more than ~0.4 g/kg in a single meal provides no additional MPS benefit — the excess is oxidized for energy. Leucine, a branched-chain amino acid, is the primary trigger for MPS. A meal needs ~2–3g of leucine (found in ~25–30g of quality protein) to maximally stimulate synthesis. A post-workout meal with 30–40g of protein is the most important feeding window.

Frequently Asked Questions

Can I eat too much protein?

For healthy individuals, high protein intake (up to 3.3 g/kg) is safe and does not damage kidneys or liver. However, intakes above 2.2 g/kg provide no additional muscle-building benefit and may displace other nutrients. Individuals with pre-existing kidney disease should consult their doctor.

When should I have protein post-workout?

The "anabolic window" is wider than commonly thought — you have 4–6 hours post-workout, not 30 minutes. However, consuming 30–40g of protein within 2 hours of training is optimal timing. The most important factor is total daily intake, not precise timing.

Is plant protein as effective as animal protein?

Plant protein can be effective but requires more attention to amino acid profiles. Animal proteins (whey, egg, meat) are "complete" — they contain all essential amino acids in ratios that strongly stimulate MPS. Most plant proteins are lower in leucine (the key MPS trigger), lysine, and methionine. To match animal protein effectiveness, combine complementary plant proteins (e.g., rice + pea, soy + wheat) and aim for ~35–40g of plant protein per meal vs. ~25–30g of animal protein. Soy and pea protein isolate score well among plant options, while single sources like wheat or rice protein are less effective for MPS. Overall, a varied plant-based diet with adequate total protein (2.0–2.2 g/kg) supports muscle growth similarly to animal protein.

Sources

• NIH - Dietary Protein
• WHO/FAO - Protein Requirements