ZOVATOOL

Protein Calculator

Daily protein target
90 – 120 g
Midpoint 105 g · 420 kcal
Per meal (×3)
35 g
Per meal (×4)
26 g
Per meal (×5)
21 g
Reference foods (~25 g protein)
• 100 g chicken breast
• 100 g lean beef
• 130 g cottage cheese
• 150 g Greek yogurt
• 4 large eggs
• 100 g tuna
• 1 scoop whey (30 g serv.)
• 250 g tofu firm
• 1 cup lentils cooked
• 150 g salmon

How to use the Protein Calculator

  1. Enter body weight (kg or lb) and body fat % if known (uses lean mass for lean athletes).
  2. Choose a goal: fat loss (2.2–3.1 g/kg), muscle gain (1.6–2.2), maintenance (1.2–1.6), endurance (1.4–1.7), senior/sarcopenia (1.2–2.0), vegan (add 10%).
  3. Select activity level — sedentary to high-volume athlete.
  4. Read daily protein grams plus per-meal targets (20–40 g per meal to maximize MPS).
  5. For seniors: use higher end (35–40 g per meal) to overcome anabolic resistance.
  6. For vegans: calculator adds 10% to compensate for lower leucine density.
  7. See leucine target — 2.5–3 g per meal to trigger muscle protein synthesis.
  8. Review high-protein food examples with grams per serving.
  9. Track for 2–3 weeks to build portion intuition.
  10. Recalculate if goal, weight or activity level changes.
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Protein intake in 2026: what current evidence actually says

Protein is the only macronutrient with a genuine consensus on 'more is better' within reasonable limits. Modern sports nutrition research — Phillips, Aragon, Schoenfeld, Helms — puts optimal intake for anyone lifting weights at 1.6–2.2 g per kg of body weight per day, roughly double the old RDA of 0.8 g/kg. That RDA was set as the minimum to prevent deficiency in sedentary adults, not to optimize body composition or aging.

For fat loss while preserving muscle, evidence supports 2.2–3.1 g/kg of body weight (some studies suggest even higher when body fat is low and the deficit is aggressive). At this intake, muscle loss during a cut drops from typical 25–30% of total loss to under 10%. The extra protein raises thermic effect of food (about 25% of protein calories burn during digestion vs 5% for carbs and 3% for fat), improves satiety, and keeps you strong in the gym.

Per-meal distribution matters as much as daily total. Research on muscle protein synthesis (MPS) shows a threshold of ~20 g of high-quality protein per meal to fully stimulate MPS in young adults, rising to 35–40 g per meal in older adults due to 'anabolic resistance.' Spreading intake across 3–5 meals with 25–40 g per meal maximizes daily MPS. Massive single doses (over 60 g) don't hurt but the returns diminish sharply.

The leucine story: the branched-chain amino acid leucine is the trigger for MPS via mTOR signaling. Each meal needs about 2.5–3 g of leucine to hit the anabolic threshold. Whey is the champion (10–12% leucine), followed by animal proteins (8–10%). Most plant proteins are 6–8% leucine — hence the general recommendation for vegans to eat 10–15% more total protein and lean on soy, pea, and rice+pea blends for leucine density.

Two persistent myths worth killing. First: 'too much protein hurts kidneys.' Multiple 2020–2023 meta-analyses show no kidney harm at up to 3.5 g/kg in adults with normal renal function. Those with existing chronic kidney disease do need to moderate — that's a specific clinical exception, not a general rule. Second: 'your body can only absorb 30 g per meal.' Not true. Digestion is nearly complete; what plateaus is muscle protein synthesis, and that plateau is per meal, not per day. Hit your total, spread it across meals, prioritize high-leucine sources, and let years compound.