Protein Intake Calculator

How Much Protein Do You Actually Need?

Protein requirements depend on body weight, activity level, age, and goal. The official RDA of 0.36g per pound is the minimum to prevent deficiency in sedentary adults — most active people need significantly more for optimal health and body composition.

Protein for Different Goals

For general health and weight maintenance: 0.54–0.73g/lb supports muscle health and keeps hunger controlled. For weight loss: 0.73–1.0g/lb preserves lean mass during a calorie deficit — critical because the body tends to break down muscle for energy when calories are restricted. For muscle building: 0.73–1.0g/lb is sufficient for most people; research shows diminishing returns above 1.0g/lb. For serious athletes: 0.9–1.2g/lb supports training volumes of 10+ hours per week.

Protein Quality Matters

Complete proteins contain all nine essential amino acids. Animal proteins (meat, eggs, dairy, fish) are typically complete. Most plant proteins are incomplete, though soy, quinoa, and hemp seed are exceptions. The key amino acid for muscle protein synthesis is leucine — animal proteins generally have 2–3× more leucine than plant proteins of equal weight. Combining rice and beans, or other legume+grain combinations, provides all essential amino acids.

Distributing Protein Through the Day

Muscle protein synthesis peaks and refractory period means consuming 20–40g of protein every 3–5 hours optimizes muscle building better than eating the same total in fewer, larger meals. Three to five protein-rich meals per day (25–50g each) is the practical implementation. A protein-rich breakfast is particularly beneficial — many people skip protein in the morning and front-load it at dinner.

Protein Requirements by Goal: Quick Reference

Here's what different daily protein targets look like in practical grams per day across common body weights:

Top Protein Sources Ranked by Efficiency

Getting enough protein is far easier when you know which foods deliver the most per calorie and per dollar:

• Egg whites: 26g protein per 120 cal — highest protein-to-calorie ratio of any whole food
• Chicken breast (cooked): 31g per 165 cal — most cost-effective animal protein
• Canned tuna: 25g per 130 cal — cheapest high-quality protein per gram
• Greek yogurt (nonfat): 17g per 100 cal — easy, no prep, casein protein (slow-digesting)
• Cottage cheese: 14g per 90 cal — high in casein, ideal pre-sleep protein
• Lean ground beef (90/10): 22g per 170 cal — easy meal prep, also high in creatine and iron
• Whey protein powder: 24–27g per 120–140 cal — convenient, fast-absorbing, particularly useful post-workout
• Lentils (cooked): 18g per 230 cal — best plant protein source; also high in fiber and iron

The Upper Limit: Can You Eat Too Much Protein?

In healthy adults with normal kidney function, protein intakes up to 1.5–2.0g/lb per day have not shown adverse health effects in research studies. The main practical concern is that high protein diets are filling — at very high intakes, it becomes difficult to also meet carbohydrate and fat needs within a reasonable calorie budget. Most research shows protein benefits plateau around 1.0–1.2g/lb for natural athletes; consuming 2.0g/lb provides no additional muscle-building benefit and simply displaces calories better used for carbohydrates.