Protein Intake Calculator – Find Your Daily Protein Needs
The protein intake calculator helps you determine exactly how much protein your body needs each day based on your weight, activity level, and fitness goals. Whether you're trying to lose fat, build muscle, or simply maintain a healthy lifestyle, getting your protein intake right is one of the most important nutritional decisions you can make. Use this tool to get a personalized protein recommendation in seconds.
Enter your current body weight.
Select the activity level that best describes your typical week.
Your goal affects how much protein you need daily.
If known, body fat % allows a more precise lean mass calculation.
Your results will appear here
How to Use This Calculator
1. Enter your body weight and select whether it's in kilograms or pounds. 2. Input your age and select your biological sex. 3. Choose the activity level that best matches your typical weekly exercise routine. 4. Select your primary fitness goal — fat loss, maintenance, muscle building, or athletic performance. 5. Optionally, enter your body fat percentage for a more accurate lean mass calculation. 6. Click Calculate to see your minimum, recommended, and maximum daily protein targets, plus a per-meal breakdown.
How Is Daily Protein Intake Calculated?
Protein requirements are primarily based on lean body mass (LBM) — the weight of your body minus fat tissue. Muscles, organs, and bones all require protein for maintenance and repair, so a more muscular or active person needs more protein per day than a sedentary one.
Step 1: Determine Lean Body Mass
If you provide your body fat percentage, lean body mass is calculated as:
- Lean Body Mass (kg) = Total Weight (kg) × (1 − Body Fat % / 100)
If no body fat percentage is given, an estimate is used based on sex (85% lean mass for males, 75% for females) as a reasonable population average.
Step 2: Apply Activity and Goal Multipliers
Research-backed protein multipliers (grams per kg of lean body mass) are applied based on your activity level and goal:
- Sedentary: 0.8 – 1.2 g/kg LBM
- Lightly Active: 1.0 – 1.4 g/kg LBM
- Moderately Active: 1.2 – 1.7 g/kg LBM
- Very Active: 1.5 – 2.0 g/kg LBM
- Extra Active: 1.7 – 2.2 g/kg LBM
Goal Adjustments
- Fat Loss: Higher protein helps preserve muscle during a caloric deficit (1.2 – 2.0 g/kg LBM)
- Maintenance: Standard needs for tissue repair (0.8 – 1.6 g/kg LBM)
- Muscle Building: Elevated protein supports muscle protein synthesis (1.6 – 2.4 g/kg LBM)
- Athletic Performance: Supports recovery and endurance (1.4 – 2.2 g/kg LBM)
Calories from Protein
Protein provides 4 calories per gram. Knowing how many calories come from protein helps you balance the rest of your macronutrients (carbohydrates and fats) within your total calorie budget.
Why Protein Matters
Protein is an essential macronutrient made up of amino acids. It is responsible for building and repairing muscle tissue, producing enzymes and hormones, supporting immune function, and keeping you feeling full and satisfied. Unlike fat and carbohydrates, the body does not store protein, so a consistent daily intake is critical.