Protein Calculator
How much protein do you need per day? Use this calculator to find your daily protein target based on your weight, activity level, and goal.
Fill in your weight and goal to see your daily protein target.
How protein needs are calculated
This calculator uses evidence-based protein recommendations (grams per kilogram of body weight) that vary by activity level and goal:
- Sedentary adults: 0.8 g/kg — the RDA, enough to prevent deficiency but not optimized for muscle maintenance or recovery.
- Active individuals: 1.6–2.0 g/kg — supports muscle repair, recovery, and performance for people who train regularly.
- Athletes: 2.0–2.2 g/kg — for those doing intense or twice-daily training; maximizes recovery and adaptation.
- Fat loss: 2.0–2.4 g/kg — higher protein during a calorie deficit helps preserve muscle while losing fat.
- Muscle gain: 1.6–2.0 g/kg — combined with a calorie surplus and strength training, this range supports muscle growth.
These ranges are based on research in strength athletes and active populations. Individual needs may vary slightly, but these targets are a good starting point for most people.
Why protein matters
Protein is the only macronutrient that provides nitrogen, which your body needs to build and repair tissues. Every cell, enzyme, hormone, and antibody is made from amino acids (the building blocks of protein). Without adequate protein:
- You lose muscle mass, especially during weight loss or aging.
- Recovery from training is slower and less complete.
- Immune function weakens, making you more prone to illness.
- Hunger increases, making it harder to stick to a calorie target.
Eating enough protein is one of the simplest, highest-impact nutrition changes you can make — whether your goal is fat loss, muscle gain, or just staying healthy as you age.
Protein timing and distribution
Total daily protein matters most, but distribution also helps. Research shows that muscle protein synthesis is maximized when you consume 20–40g of protein per meal, spread across 3–4 meals throughout the day.
For example, if your target is 150g per day, aim for ~40g at breakfast, lunch, and dinner, plus a 30g snack. This approach is more effective than eating 100g at dinner and scraps the rest of the day.
Protein sources
Prioritize whole-food protein sources when possible:
- Animal sources: Chicken, beef, pork, fish, eggs, Greek yogurt, cottage cheese — complete proteins with all essential amino acids.
- Plant sources: Lentils, chickpeas, black beans, tofu, tempeh, quinoa, edamame — often incomplete on their own, but variety across the day covers all amino acids.
- Protein powder: Whey, casein, or plant-based powders (pea, rice, soy) are convenient supplements but not required. Use them to fill gaps if hitting your target from food alone is difficult.
Whole foods provide protein plus vitamins, minerals, and fiber. Powder is a tool, not a replacement for real food.
How much protein do I need per day?
It depends on your weight, activity level, and goal. Sedentary adults need about 0.8 g/kg (the RDA). Active people benefit from 1.6–2.0 g/kg. Athletes and those cutting fat may need 2.0–2.2 g/kg to preserve muscle.
Why is protein important?
Protein provides the amino acids your body uses to build and repair muscle, make enzymes and hormones, and support immune function. Without enough protein, you lose muscle mass, recover poorly from training, and may feel weak or fatigued.
Can I eat too much protein?
For healthy adults with normal kidney function, high protein intake (up to 2.2 g/kg or more) is safe. Excess protein is burned for energy or converted to other compounds; it doesn't automatically turn into muscle. Very high intakes may displace other nutrients, so balance is key.
Do I need protein powder?
No. Protein powder is convenient, but whole foods (chicken, fish, eggs, dairy, legumes) provide complete nutrition. Use powder if you struggle to hit your protein target from food alone, but it's a supplement, not a requirement.
Should I spread protein throughout the day?
Yes. Muscle protein synthesis is maximized when you eat 20–40g of protein per meal, spread across 3–4 meals. A single huge protein meal is less effective than smaller, evenly distributed servings.
Does protein help with fat loss?
Yes, in two ways. First, protein is more satiating than carbs or fat, so it helps you feel full and eat less. Second, high protein during a calorie deficit preserves muscle mass, so you lose fat instead of muscle.
What if I'm vegetarian or vegan?
You can meet protein needs on a plant-based diet, but it requires more planning. Focus on high-protein plant foods (lentils, chickpeas, tofu, tempeh, seitan, quinoa) and consider a vegan protein powder to fill gaps.
How do I track protein intake?
Use a food tracking app (MyFitnessPal, Cronometer, etc.) or read nutrition labels. Most whole foods list protein per serving. Aim to hit your daily target consistently — one low day won't hurt, but chronic undereating will.