How this calculator works
The adult RDA of 0.8 g/kg is a population-level minimum designed to cover basic needs, not necessarily an optimal target for every training or dieting context. Active people often benefit from a higher range.
Protein needs are better expressed per kilogram than as a calorie percentage. That keeps the target from shrinking automatically when calorie intake falls during a diet.
The calculator uses 0.8–1.2 g/kg for general maintenance, 1.6–2.0 g/kg during fat loss and 1.6–2.2 g/kg for muscle-focused training.
How to use the result
Choose a point in the range that fits appetite, food preferences and training. The upper edge is not a prize; more protein is not automatically more muscle once needs are met.
Distribution can make the target easier. Three or four meals with a meaningful protein source usually works better than trying to recover the entire shortfall at dinner.
Get a more reliable result
Use current body weight unless a clinician has given you a different reference weight. Select the goal that reflects your actual training and energy intake. The estimate assumes a healthy adult; kidney disease, pregnancy, older age, injury recovery and highly restrictive diets may require individual assessment.
Common errors that change the answer
- Assuming more protein keeps improving results without limit.
- Meeting the total with supplements while meals lack fibre, produce and dietary variety.
- Applying a general sports range to kidney disease or another condition without clinical advice.
What to do next
- Start by improving the meal that currently contains least protein.
- Use ordinary foods first; powder is a convenience, not a requirement.
- If current weight greatly exceeds a realistic goal weight, consider calculating from goal weight with professional guidance.
Guides that support this calculator
Frequently asked questions
Do I need protein immediately after training?
The total day and regular distribution matter more than a narrow 30-minute window. A meal within a few hours is practical.
Can I get enough from plants?
Yes. Use varied legumes, soy foods, grains, nuts and seeds, and allow slightly larger portions where useful.
Is high protein safe for kidneys?
Healthy adults generally tolerate common sports-nutrition ranges, but kidney disease changes the decision and requires clinical guidance.