How to Calculate Your Daily Protein Intake
Protein is the most important nutrient for building and maintaining muscle tissue, recovering from exercise, managing hunger and supporting overall health. Yet most people either undereat it significantly or have no idea how much they actually need.
This guide explains how protein needs are calculated, gives you the numbers for different goals and links to the free Protein Calculator on CalConvs.
What Protein Actually Does in the Body
Protein is made up of amino acids, which are the building blocks of virtually every tissue in the body. When you eat protein, your digestive system breaks it down into amino acids that your body uses for:
- Building and repairing muscle fibres after exercise
- Producing enzymes and hormones including insulin and growth hormone
- Supporting immune function
- Keeping you feeling full and satisfied after meals, which helps with calorie management
- Preserving lean muscle tissue during periods of calorie restriction
Of the three macronutrients, protein has the highest thermic effect. The body uses about 20 to 30 percent of the calories in protein just to digest and process it, compared to 5 to 10 percent for carbohydrates and 0 to 3 percent for fat.
The Evidence-Based Protein Recommendations
| Goal or Activity Level | Daily Protein Target |
|---|---|
| Sedentary adults (general health) | 0.8 g per kg of body weight |
| Older adults (65 years and above) | 1.0 to 1.2 g per kg |
| Active adults (regular exercise) | 1.2 to 1.6 g per kg |
| Building muscle (hypertrophy focus) | 1.6 to 2.2 g per kg |
| Cutting (calorie deficit with training) | 2.0 to 2.4 g per kg |
| Elite athletes | 2.2 to 3.0 g per kg in some contexts |
Worked Example: Active Woman, 70 kg, Fat Loss Goal
Recommended range: 2.0 to 2.4 g per kg
Minimum target: 70 × 2.0 = 140 g protein per day
Upper target: 70 × 2.4 = 168 g protein per day
Aim for 140 to 168 grams distributed across 3 to 5 meals.
Should You Use Body Weight or Lean Body Mass?
The recommendations above use total body weight. Some coaches and researchers argue that protein targets should be calculated on lean body mass (total weight minus fat weight). This matters most for people who carry significantly above-average body fat.
For example, a person who weighs 100 kg but has 35 percent body fat has a lean body mass of 65 kg. Targeting 2.0 g per kg of lean body mass gives 130 g of protein, while targeting 2.0 g per kg of total body weight gives 200 g. Use the Body Fat Calculator to estimate your lean body mass if this applies to you.
High Protein Foods and Their Protein Content
| Food | Protein Content |
|---|---|
| Chicken breast (100g cooked) | 31 g protein |
| Tuna (100g canned in water) | 26 g protein |
| Salmon (100g cooked) | 25 g protein |
| Eggs (1 large) | 6 g protein |
| Greek yoghurt (170g) | 17 g protein |
| Lean beef mince (100g cooked) | 26 g protein |
| Lentils (100g cooked) | 9 g protein |
| Tofu (100g firm) | 8 g protein |
| Whey protein powder (1 scoop, 30g) | 22 to 25 g protein |
| Milk (240ml) | 8 g protein |
How to Distribute Protein Throughout the Day
Research suggests that spreading protein intake across 3 to 5 meals is more effective for muscle protein synthesis than eating the same total in 1 or 2 large sittings. Each meal should ideally contain at least 20 to 40 grams of protein.
Example Daily Protein Distribution for a 150 g Target
Breakfast: 3 eggs + 1 cup Greek yoghurt = approximately 35 g
Lunch: 150g chicken breast + legumes = approximately 50 g
Snack: 1 scoop protein powder + milk = approximately 32 g
Dinner: 150g salmon + vegetables = approximately 40 g
Total: approximately 157 g protein
Is Too Much Protein Harmful?
For healthy adults with normal kidney function, there is no strong evidence that high protein intakes up to 3 g per kg of body weight per day cause harm. The concern about protein and kidney damage applies specifically to people who already have kidney disease.
Very high protein intakes may displace other important nutrients if total calorie intake is limited. Keep protein at sensible levels and maintain balance across all macronutrients.
Related Tools
- Protein Calculator: personalised daily protein target based on your weight and goal
- Macro Calculator: full macronutrient breakdown including carbs and fat
- Body Fat Calculator: estimate lean body mass for protein calculations
- Calorie Calculator: daily calorie needs to pair with your protein target
- All Health and Fitness Tools: browse all tools on CalConvs
Frequently Asked Questions
Can you eat too much protein?
For most healthy adults, very high protein intakes are safe. There is no evidence that intakes up to 3 g per kg per day cause harm in people with healthy kidneys. The main practical downside is that very high protein intake can displace carbohydrates and fats, which are also important for health and performance.
Does protein help with weight loss?
Yes. Protein supports weight loss in several ways: it is the most satiating macronutrient, it has a high thermic effect, and it preserves lean muscle mass during a calorie deficit. Preserving muscle keeps your metabolic rate higher during weight loss.
Do plant-based proteins count the same?
Plant proteins are generally lower in one or more essential amino acids and are often less bioavailable than animal proteins. Vegans and vegetarians should aim for the higher end of protein recommendations and combine different plant sources to ensure they get all essential amino acids.
When is the best time to eat protein?
Distributing protein evenly across meals throughout the day is more important than timing around workouts. That said, consuming 20 to 40 g of protein within 1 to 2 hours after resistance training can support muscle recovery. Total daily intake matters far more than timing for most people.