Protein Calculator Daily Intake Tool
Protein Calculator
Protein Requirements Calculator
Ages 18-80
Exercise: 15-30 min elevated heart rate. Intense: 45-120 min. Very intense: 2+ hours.
Protein is essential for building and repairing muscle, supporting immune function, and keeping you feeling full. Your optimal daily protein intake depends on your body weight, activity level, and goals. This calculator estimates how much protein you need per day whether you are trying to build muscle, lose fat, or simply maintain your health.
Protein Recommendations by Goal
The RDA of 0.8g per kilogram of body weight is the minimum to prevent deficiency, not the optimal amount for active people. Research consistently shows higher intakes are beneficial for those who exercise regularly, are trying to build muscle, or are in a calorie deficit.
| Goal / Population | Protein Recommendation |
|---|---|
| Sedentary adult (minimum) | 0.8 g/kg body weight |
| Active adult, general fitness | 1.2-1.6 g/kg body weight |
| Building muscle | 1.6-2.2 g/kg body weight |
| Losing fat (preserving muscle) | 2.0-2.4 g/kg body weight |
| Endurance athlete | 1.4-1.7 g/kg body weight |
Best Protein Sources
Complete proteins contain all essential amino acids. Animal sources (chicken, eggs, fish, beef, dairy) are complete. Most plant sources are incomplete, but combining different plant proteins throughout the day covers all amino acids. Leucine content is especially important for muscle protein synthesis.
Protein per 100g (approx): Chicken breast: 31g | Eggs: 13g | Greek yogurt: 10g Lentils: 9g | Tofu: 8g | Quinoa: 4g
Frequently Asked Questions
Can you eat too much protein?⌄
For most healthy adults, high protein intake (up to 3g/kg) shows no harmful effects in research. The kidneys of healthy people handle high protein just fine. The main practical concern is that very high protein displaces other nutrients. People with existing kidney disease should follow their doctor's specific guidance on protein intake.
Does protein timing matter?⌄
Spreading protein across 3-5 meals of 25-40g each maximizes muscle protein synthesis better than eating most protein in one sitting. The anabolic window after training is real but wider than once thought -- getting adequate protein within a few hours before or after training is sufficient for most people.
Do I need protein supplements?⌄
No. Whole food sources work just as well. Protein powders are convenient but not necessary. If you struggle to hit your daily target through food alone, a shake can help fill the gap. Whey protein is the most researched supplement for muscle building. Plant-based blends (pea + rice) perform similarly.
What happens if I do not get enough protein?⌄
Insufficient protein leads to muscle loss, slower recovery from exercise, impaired immune function, and increased hunger. During weight loss, inadequate protein causes the body to break down muscle for fuel, reducing metabolic rate and undermining the goal of improving body composition.