Protein Intake Calculator

Why Protein Intake Targets Vary

The long-standing RDA of 0.8 g/kg/day was designed to prevent deficiency in sedentary adults — not to optimise athletic performance or body composition. Sports nutrition research consistently shows that active individuals benefit from 1.4–2.6 g/kg/day depending on training type, intensity, and goals. This calculator applies evidence-based ranges drawn from systematic reviews and meta-analyses in exercise science.

Goal-Specific Protein Needs

Muscle gain requires a positive muscle protein balance, achieved with 1.6–2.4 g/kg/day in combination with resistance training. Fat loss calls for similar or slightly higher intakes (1.6–2.4 g/kg) because protein's high satiety index curbs hunger and preserves lean mass during a calorie deficit. Endurance athletes typically need 1.2–1.8 g/kg to repair muscle microdamage from repetitive-motion training. Maintenance sits at 0.8–1.6 g/kg, with more active individuals trending toward the higher end.

Protein Quality and Food Sources

Not all protein is equal. Complete proteins containing all essential amino acids — eggs, dairy, meat, fish, and soy — are best utilised for muscle protein synthesis. Animal sources and soy are leucine-rich, which is the key amino acid that triggers muscle building. Plant-based eaters can meet targets by combining complementary sources (legumes + grains) and aiming for the upper end of the recommended range to compensate for lower digestibility.

Hydration and Kidney Considerations

Higher protein intakes increase urea production, so adequate hydration is important. For people with healthy kidneys, high-protein diets are safe. However, individuals with existing kidney disease or a family history of it should consult a physician before significantly increasing protein intake, as reduced kidney function impairs the body's ability to clear nitrogen waste products.