Evidence and practical planning
Protein Calculator
Compare an evidence-supported daily range with FitCalc's clearly labeled practical recommendation.
Calculate your protein target
Your Protein Target
Your protein results are ready.
FitCalc recommended target
A practical high-protein target. Going somewhat above this is fine if it fits your calories and preferences, but more is not automatically better.
Evidence-supported range
The range changes with resistance-training and fat-loss context.
Protein supports muscle growth, but resistance training provides the primary stimulus for building muscle.
Related tools
Evidence range versus FitCalc recommendation
For adults who resistance train, the evidence range is 1.6–2.2 g/kg/day. Research finds diminishing additional lean-mass benefit around 1.6 g/kg/day on average, while the upper end offers a simple planning margin.
For adults not regularly resistance training, evidence ranges remain 1.2–1.6 g/kg for maintenance or muscle-building intent and 1.4–1.8 g/kg during fat loss. FitCalc's recommendation is intentionally higher: 1.8 g/kg for general maintenance, 2.0 for general fat loss, and 2.2 for general muscle building and resistance-training contexts. These are practical editorial targets, not scientific minimums.
Why does FitCalc often recommend about 1 g/lb?
It is memorable, sits near the high end of common resistance-training guidance, and provides a practical margin during dieting. More protein does not automatically create more muscle, and lower amounts within the evidence range may work well.
Body weight and body fat
Total-body-weight scaling can overshoot for people with higher body fat. When an optional estimate of at least 30% is supplied, FitCalc uses lean mass to derive a reference equivalent to 25% body fat. This is explicitly labeled a FitCalc reference-weight adjustment—not a research-established threshold—and prevents fat mass from producing an unnecessarily extreme target.
Scope and safety
This educational calculator is for generally healthy adults. It does not provide pediatric, pregnancy/lactation, kidney-disease, or clinical nutrition recommendations. People in those groups should use individualized guidance from an appropriate clinician or registered dietitian.