Protein Intake Calculator
Calculate protein intake quickly with our calories & nutrition tool. Get results based on evidence-based formulas with clear explanations.
Formula
Daily Protein (g) = Body Weight (kg) × Activity Multiplier
Multiply body weight in kilograms by the activity-specific multiplier: Sedentary 0.8 g/kg, Active 1.4 g/kg, Athlete 1.8 g/kg, Bodybuilder 2.2 g/kg. Divide daily total by number of meals for per-meal targets. Each gram of protein provides 4 calories.
Worked Examples
Example 1: Active Female — Regular Exerciser
Problem: 140 lb female, active (exercises 4 days/week), eats 4 meals per day.
Solution: Weight in kg: 140 x 0.4536 = 63.5 kg\nActive multiplier: 1.4 g/kg\nDaily protein: 63.5 x 1.4 = 89g\nPer meal (4 meals): 89 / 4 = 22g\nProtein calories: 89 x 4 = 356 cal
Result: Daily protein: 89g | Per meal: 22g | 356 calories from protein
Example 2: Male Bodybuilder — Muscle Gain
Problem: 200 lb male bodybuilder, strength training 6 days/week, eats 5 meals per day.
Solution: Weight in kg: 200 x 0.4536 = 90.7 kg\nBodybuilder multiplier: 2.2 g/kg\nDaily protein: 90.7 x 2.2 = 200g\nPer meal (5 meals): 200 / 5 = 40g\nProtein calories: 200 x 4 = 800 cal
Result: Daily protein: 200g | Per meal: 40g | 800 calories from protein
Frequently Asked Questions
How much protein do I need per day?
Daily protein needs vary significantly based on activity level, goals, and body composition. The Recommended Dietary Allowance (RDA) of 0.36 grams per pound (0.8g/kg) is the minimum to prevent deficiency in sedentary adults, not the optimal amount for active individuals. Research from the International Society of Sports Nutrition recommends 0.65-1.0 grams per pound (1.4-2.2g/kg) for physically active people. Athletes and those in a caloric deficit benefit from the higher end of this range. Protein needs increase with exercise intensity, muscle mass goals, and during weight loss to preserve lean tissue.
Can you eat too much protein?
For healthy individuals with normal kidney function, high protein intake up to 1.5 grams per pound (3.3g/kg) has been shown to be safe in research studies lasting up to one year. The concern about protein damaging kidneys applies only to people with pre-existing kidney disease. However, excessively high protein intake provides diminishing returns for muscle building beyond about 1.0-1.2 grams per pound. Excess protein calories still contribute to caloric surplus and potential fat gain. Additionally, very high protein diets may displace other important nutrients from carbohydrates and fats, potentially affecting athletic performance and hormone balance.
What are the best sources of protein?
Complete protein sources containing all essential amino acids include chicken breast (31g per 100g), eggs (6g per egg), Greek yogurt (17g per cup), salmon (25g per 100g), lean beef (26g per 100g), whey protein powder (25g per scoop), and tofu (10g per 100g). For muscle building, leucine content matters most, and animal proteins typically provide more leucine per serving. Plant-based athletes can meet protein needs by combining legumes, grains, nuts, and seeds throughout the day. Protein quality is measured by the Digestible Indispensable Amino Acid Score (DIAAS), with whey, eggs, and milk scoring highest.
Does the timing of protein intake matter?
Protein timing plays a moderate role in optimizing muscle protein synthesis (MPS). Research shows that consuming 20-40 grams of protein every 3-4 hours maximizes MPS throughout the day. The anabolic window post-workout is larger than previously thought, extending 2-3 hours after training rather than the mythical 30-minute window. Pre-sleep protein (casein or a mixed meal containing 30-40g protein) has been shown to improve overnight muscle recovery. For most people, total daily protein intake matters significantly more than precise timing. Distributing protein evenly across meals is more beneficial than consuming most of it in one large meal.
Should I use protein supplements?
Protein supplements are convenient but not necessary if you can meet your daily targets through whole foods. Whey protein isolate is one of the most researched supplements and effectively supports muscle growth when combined with resistance training. Casein protein digests more slowly and is ideal before bed. Plant-based options like pea, rice, and soy protein powders are suitable alternatives for those avoiding dairy. Supplements become most practical when protein needs exceed 1 gram per pound daily, making it difficult to consume enough through food alone. Always prioritize whole food sources first, as they provide additional micronutrients, fiber, and other beneficial compounds.
How do I get the most accurate result?
Enter values as precisely as possible using the correct units for each field. Check that you have selected the right unit (e.g. kilograms vs pounds, meters vs feet) before calculating. Rounding inputs early can reduce output precision.