How Much Protein Do You Actually Need Per Day?

Protein advice ranges from “0.8 g/kg is enough” to “eat your bodyweight in grams.” The truth depends entirely on what you’re asking your body to do.

The formula hierarchy

Minimum (sedentary adult):     0.8 g/kg body weight
Active / general fitness:      1.2–1.6 g/kg
Building muscle:               1.6–2.2 g/kg
Losing weight (preserve muscle): 2.0–2.4 g/kg
Endurance athletes:            1.2–1.8 g/kg
Elderly (prevent sarcopenia):  1.2–1.5 g/kg

Note: These are per kilogram of total body weight. For obese individuals, use ideal body weight or lean body mass instead.

Why the RDA of 0.8 g/kg is a minimum, not a target

The RDA (Recommended Dietary Allowance) prevents protein deficiency in 97.5% of the sedentary population. It’s the floor, not the ceiling. Research consistently shows higher intakes improve:

• Muscle protein synthesis
• Satiety (feeling full longer)
• Metabolic rate (thermic effect of food)
• Body composition during weight loss
• Recovery from exercise and injury

Worked example

Male, 75 kg, moderately active, goal is muscle building:

Low end:  75 × 1.6 = 120g protein/day
High end: 75 × 2.2 = 165g protein/day
Target:   ~140g/day (middle of range)

In food terms:
  Chicken breast (100g) = 31g protein
  Eggs (2 large) = 12g protein
  Greek yogurt (200g) = 20g protein
  Lentils (1 cup cooked) = 18g protein
  Whey protein scoop = 25g protein

Timing: does it matter?

The “anabolic window” isn’t as narrow as gym bros claim, but distribution matters:

• Spread protein across 3–5 meals (20–40g per sitting)
• Post-workout protein within 2 hours is beneficial, not critical
• Pre-sleep casein (slow-digesting) supports overnight recovery
• Total daily intake matters more than perfect timing

When to calculate your protein needs

• Starting a strength training program
• Entering a calorie deficit (protein prevents muscle loss)
• Recovering from surgery or injury
• Over 50 and noticing muscle loss
• Switching to a plant-based diet (need to plan more carefully)

Tips for hitting protein targets

• Anchor each meal around a protein source first
• Protein snacks: jerky, cottage cheese, edamame, protein bars
• Plant-based proteins are less bioavailable — aim 10–20% higher
• Leucine content matters: whey, eggs, and beef are highest
• Kidney concerns are unfounded in healthy individuals at 2.2 g/kg
• Track for one week to see where you actually land — most people are surprised

Calculate your exact daily target with OurDailyCalc’s protein calculator — enter your weight, activity level, and goal for a personalized recommendation.

TL;DR

• Sedentary minimum: 0.8 g/kg (just to avoid deficiency)
• Active adults: 1.6–2.2 g/kg for muscle and performance
• Dieting: go higher (2.0–2.4 g/kg) to protect muscle
• Spread across 3–5 meals, 20–40g each
• Total daily amount matters most; timing is secondary