Protein Calculator
Calculate your optimal daily protein intake for your fitness goals
How to Use This Protein Calculator
- Enter your age, gender, and body measurements
- Select your activity level from sedentary to athlete
- Choose your fitness goal: maintain, build muscle, or lose weight
- Click 'Calculate Protein' to see your personalized daily target and per-meal breakdown
Example: A 180 lb moderately active male wanting to build muscle needs ~140-160g protein daily. That's 45-55g per meal (3 meals) or 35-40g per meal (4 meals). This equals about 6 oz chicken breast at each meal.
Tip: For easier tracking, aim for a palm-sized portion of protein (20-30g) at each meal rather than calculating exact grams. Most people underestimate protein portions - weigh your food for a week to calibrate your eye.
Why Use a Protein Calculator?
Protein is the most underconsumed macronutrient for active people, yet it's critical for muscle, recovery, and staying full. Most people eat enough to survive but not enough to thrive.
- Calculate your optimal protein intake based on activity and goals
- Know exactly how much protein to eat per meal for muscle protein synthesis
- Adjust intake for cutting (higher protein) vs. bulking phases
- Understand why your recovery or muscle gains have plateaued
- Plan meals around protein targets without overthinking
- Compare your current intake to evidence-based recommendations
Understanding Your Results
Results show your daily protein target in grams, broken down by meal frequency, with a recommended range based on your activity level and goals.
| Result | Meaning | Action |
|---|---|---|
| 0.8-1.0g per kg (sedentary, maintenance) | Minimum to prevent deficiency | Adequate for desk jobs with no exercise; most benefit from more |
| 1.2-1.6g per kg (active, maintenance) | Supports regular exercise and muscle maintenance | Appropriate for recreational exercisers 3-5 days/week |
| 1.6-2.0g per kg (muscle building) | Maximizes muscle protein synthesis with resistance training | Higher end (1.8-2.0g) for serious lifters; diminishing returns beyond 2.2g |
| 1.8-2.4g per kg (fat loss while training) | Preserves muscle during caloric deficit | Higher protein is more important when losing weight than when maintaining |
Meaning: Minimum to prevent deficiency
Action: Adequate for desk jobs with no exercise; most benefit from more
Meaning: Supports regular exercise and muscle maintenance
Action: Appropriate for recreational exercisers 3-5 days/week
Meaning: Maximizes muscle protein synthesis with resistance training
Action: Higher end (1.8-2.0g) for serious lifters; diminishing returns beyond 2.2g
Meaning: Preserves muscle during caloric deficit
Action: Higher protein is more important when losing weight than when maintaining
Note: These are per kg of body weight. For those with significant excess body fat, calculate based on goal weight or lean body mass rather than total weight to avoid overshooting.
About Protein Calculator
Formula
Daily Protein = Body Weight (kg) × Protein Multiplier (based on activity/goals) Multipliers range from 0.8g/kg for sedentary maintenance to 2.2g/kg for athletes building muscle or preserving muscle during aggressive fat loss. The calculator applies appropriate multipliers based on your selections.
Current Standards: Research supports 1.6-2.2g/kg for muscle building (Morton et al., 2018). The International Society of Sports Nutrition recommends 1.4-2.0g/kg for exercising individuals. During caloric deficit, higher protein (2.0-2.4g/kg) helps preserve lean mass.
Frequently Asked Questions
Is high protein bad for my kidneys?
For healthy individuals, no. Multiple studies show that protein intake up to 2.8g/kg doesn't harm kidney function in people with healthy kidneys. The concern originated from recommendations for people with pre-existing kidney disease, who do need to limit protein. If you have kidney disease, follow your doctor's guidance. For everyone else, normal-to-high protein intake is safe and beneficial.
How much protein can I absorb in one meal?
The old '30g per meal' myth has been debunked. Your body absorbs all the protein you eat - digestion just slows down to accommodate larger amounts. However, for maximizing muscle protein synthesis (MPS), research suggests 0.4-0.55g/kg per meal (roughly 30-50g for most people) across 4 meals optimally stimulates MPS. But total daily protein matters more than per-meal distribution for muscle building.
Should I eat protein immediately after working out?
The 'anabolic window' is much wider than once believed. Getting protein within 2-3 hours post-workout is fine; you don't need to rush to chug a shake in the locker room. If you train fasted, post-workout protein becomes more important. For most people who eat before training, meal timing is less critical than hitting your daily target.
Can I build muscle on a plant-based diet?
Absolutely, though it requires more attention. Plant proteins are generally lower in leucine (a key amino acid for muscle building) and less bioavailable. Compensate by eating 10-20% more total protein (aim for 2.0-2.2g/kg instead of 1.6-1.8g/kg), combining protein sources (rice + beans), and including higher-quality plant proteins like soy, quinoa, and pea protein.
Why am I not building muscle despite eating enough protein?
Protein is necessary but not sufficient. You also need: adequate total calories (you can't build muscle in a significant deficit), progressive resistance training (muscles need stimulus to grow), sufficient sleep (growth hormone releases during sleep), and consistency over months. Also verify you're actually eating as much protein as you think - track accurately for a week to confirm.