About this Protein Calculator
Protein is the building block of muscle, enzymes, and hormones. Your daily requirement depends heavily on your activity level and fitness goals. Athletes and people trying to lose weight typically need more protein than the general population.
Who this calculator is for
- People setting a daily protein target for weight loss, maintenance, or muscle gain.
- Lifters and active adults who want a more goal-based protein recommendation.
- Anyone translating fitness goals into grams of protein per day.
When to use it
- Use this calculator when building a nutrition plan around training or recovery.
- Use it to compare low, moderate, and high protein targets for different goals.
- Use it when turning body weight and activity level into a practical intake goal.
How to use this calculator
- Enter your Current Weight.
- Select your Activity / Goal.
- The result shows your daily target in grams.
Key assumptions
- Protein targets are based on broad goal and activity guidelines rather than individualized medical nutrition therapy.
- Body weight is used as the main input even though lean mass and training volume can matter too.
- People with kidney disease or special clinical needs may need medical guidance instead of general fitness ranges.
Accuracy and testing
Review formula sources, default test cases, assumptions, unit handling, rounding rules, and changelog for this calculator.
How this calculator works
This calculator applies a multiplier to your body weight:
* Sedentary: 0.36g per lb (0.8g/kg)
* Active: 0.5-0.7g per lb (1.2-1.6g/kg)
* Muscle Building: 0.8-1.0g per lb (1.8-2.2g/kg)
Inputs explained
Activity / Goal
Choose the category that best describes your lifestyle. 'Build Muscle' assumes you are engaged in resistance training.
Understanding your results
The result is a daily target. For muscle building, spreading this intake across 3-5 meals (e.g., 30g per meal) is optimal for muscle protein synthesis.
Example scenarios
Sedentary Office Worker
150 lbs. Needs ~54g protein/day to prevent deficiency.
Bodybuilder
180 lbs. Needs ~144-180g protein/day to maximize muscle growth.
Key Features
- Activity-based logic
- Supports Lbs input
- Calorie conversion
Things to Keep in Mind
General recommendation. Individuals with kidney disease should consult a doctor before increasing protein intake.
Tips & Best Practices
- If you are overweight, calculate protein based on your *Goal Weight* or Lean Body Mass to avoid overeating.
- Good sources include chicken, fish, eggs, greek yogurt, tofu, and legumes.
- Eating high protein helps with weight loss because it is the most satiating macronutrient (keeps you full longer).
Glossary of Terms
- Macronutrient
- Nutrients required in large amounts: Protein, Carbohydrates, and Fats.
- Amino Acids
- The organic compounds that combine to form proteins. There are 9 'essential' amino acids the body cannot make.