What Is a Protein Calculator?
A protein calculator estimates how many grams of protein you should eat per day based on your body weight, activity level, and fitness goal. Protein is essential for building and repairing muscle, supporting recovery, managing appetite, and maintaining lean mass during fat loss. Because needs vary widely between a sedentary adult and a strength athlete, a personalized estimate is far more useful than a one-size-fits-all number.
Enter your weight and select your activity level and goal, and the calculator returns a recommended daily protein range in grams that you can build your meals and macros around.
How to Use the Protein Calculator
- Enter your weight — in pounds or kilograms.
- Select activity level — sedentary, moderately active, or very active.
- Choose your goal — maintenance, muscle gain, or fat loss.
- Calculate — see your recommended daily protein intake in grams.
How Much Protein Do You Need?
General guidelines based on grams of protein per kilogram of body weight:
| Goal / Activity | Protein (g per kg) | Protein (g per lb) |
|---|---|---|
| Sedentary adult (RDA minimum) | 0.8 g/kg | 0.36 g/lb |
| General fitness | 1.2–1.6 g/kg | 0.55–0.73 g/lb |
| Muscle gain / strength training | 1.6–2.2 g/kg | 0.73–1.0 g/lb |
| Fat loss (preserve muscle) | 1.8–2.4 g/kg | 0.82–1.1 g/lb |
Why Protein Matters
- Muscle repair and growth: resistance training breaks down muscle fibers; protein rebuilds them stronger.
- Satiety: protein is the most filling macronutrient, helping control hunger during a calorie deficit.
- Lean mass preservation: higher protein during fat loss protects muscle so more of the weight lost is fat.
- Metabolism: protein has a higher thermic effect, meaning your body burns more digesting it.
Best Protein Sources
High-quality sources include chicken, turkey, lean beef, fish, eggs, Greek yogurt, cottage cheese, and whey protein. Plant-based options include lentils, beans, tofu, tempeh, edamame, and seitan. Spreading protein across 3–4 meals of roughly 25–40 g each helps maximize muscle protein synthesis throughout the day.
Frequently Asked Questions
How much protein do I need per day?
It depends on your weight and goal. Active people aiming for muscle typically need 1.6–2.2 g per kg of body weight, while a sedentary adult needs around 0.8 g per kg. The calculator gives a personalized range.
How much protein to build muscle?
Research supports 1.6–2.2 grams of protein per kilogram of body weight per day, combined with resistance training and adequate calories, to maximize muscle growth.
Can you eat too much protein?
For healthy individuals, high-protein diets are generally safe. Extremely high intakes offer no extra muscle benefit and displace other nutrients. Those with kidney disease should consult a doctor.
Should I count protein in pounds or kilograms?
Either works — the calculator handles both. As a rough rule, active people target roughly 0.7–1.0 grams of protein per pound of body weight.
Is this protein calculator free?
Yes — it is completely free, needs no signup, and gives instant, goal-based recommendations.