Nutrition & Body Composition
Protein Calculator — Daily Intake for Muscle Gain & Fat Loss
Calculate your daily protein intake in grams based on body weight, activity level and fitness goal. Supports pounds (lb) and kilograms (kg).
Calculate Your Daily Protein Needs
Enter your body weight in pounds. Designed for healthy adults weighing 25–250 kg (approximately 55–551 lb).
Select the option that best matches your current goal. These are planning estimates.
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This is a practical starting estimate. Your ideal intake may vary with training, body composition, total calorie intake and individual health.
How Much Protein Do I Need Per Day?
Your daily protein requirement depends on body weight, activity, training status, calorie intake and fitness goals. There is no single protein target that is optimal for every person.
For generally healthy adults, the standard Recommended Dietary Allowance (RDA) is approximately 0.8 grams per kilogram of body weight per day. This is a population-level reference intake intended to prevent deficiency, not necessarily a target for maximizing resistance-training outcomes.
The International Society of Sports Nutrition (ISSN) commonly cites 1.4–2.0 g/kg/day as sufficient for building and maintaining muscle mass for most exercising individuals.
Protein Intake by Goal: Daily Protein Requirements
| Goal | Protein per day |
|---|---|
| Sedentary (adult RDA reference) | 0.8 g/kg ~0.36 g/lb |
| General activity | 1.0–1.4 g/kg ~0.45–0.64 g/lb |
| Muscle gain / maintenance | 1.4–2.0 g/kg ~0.64–0.91 g/lb |
| Cutting / fat loss | 1.6–2.4 g/kg ~0.73–1.09 g/lb |
The cutting range is athlete-oriented and should not be interpreted as a universal requirement for weight loss. For people with substantially higher body fat, a target based on total body weight may be unnecessarily high.
High-Protein Foods (Reference Table)
Meeting your daily protein target is easier when you know which foods are most dense in protein. Here are approximate protein values per 100g.
| Food | Protein (per 100g) |
|---|---|
| Chicken Breast (cooked) | ~31g |
| Lean Beef (cooked) | ~27g |
| Tuna (canned) | ~25g |
| Salmon (cooked) | ~23g |
| Greek Yogurt | ~10g |
| Eggs | ~13g |
| Whey Protein Powder | ~75g (brand dependent) |
| Tofu (firm) | ~16g |
| Lentils (cooked) | ~9g |
Data is approximate and adapted from general food composition databases such as the USDA FoodData Central.
How Much Protein Do I Need Based on My Weight?
The following examples use the muscle-gain range of 1.4–2.0 g/kg/day. Values are rounded to the nearest gram.
| Body weight | Protein per day |
|---|---|
| 120 lb (54 kg) | 76–109 g |
| 130 lb (59 kg) | 83–118 g |
| 150 lb (68 kg) | 95–136 g |
| 180 lb (82 kg) | 114–163 g |
| 200 lb (91 kg) | 127–181 g |
| 220 lb (100 kg) | 140–200 g |
Protein Calculator for Muscle Gain and Muscle Growth
Protein supplies amino acids used in muscle repair and adaptation. For most healthy exercising adults, approximately 1.4–2.0 g/kg (0.64–0.91 g/lb) per day is a commonly cited range for building or maintaining muscle.
A meta-analysis of resistance-training studies reported that additional protein benefits for fat-free-mass gains appeared to level off around a modeled intake of 1.62 g/kg/day, although individual responses and uncertainty vary. Protein intake alone does not build muscle. Progressive resistance training, appropriate calorie intake, sleep and recovery also matter.
The "30 Grams Per Meal" Myth
The claim that your body can absorb only 20–30 grams of protein at one meal is an oversimplification. Digestion and absorption do not simply stop once a meal exceeds that amount.
Sports-nutrition guidance often discusses approximately 0.25–0.4 g/kg of body weight per meal, or roughly 20–40 grams of high-quality protein, as a useful general range for supporting muscle protein synthesis. For an 80 kg (176 lb) person, this means aiming for roughly 20–32 grams of protein per meal.
Is 1 Gram of Protein per Pound Necessary?
One gram of protein per pound of body weight is a popular bodybuilding guideline, but it is not a requirement for most healthy exercising adults.
One gram per pound equals approximately 2.2 g/kg, which is slightly above the ISSN's commonly cited 1.4–2.0 g/kg/day range for most exercising individuals. More protein does not automatically produce more muscle growth.
How to Use This Protein Calculator
Getting your protein right is just one part of building your physique. Here is the step-by-step workflow:
- Estimate Your Protein: Use this calculator to estimate your daily protein range based on your body weight and goal (cutting or bulking).
- Estimate Calories: Use our TDEE Calculator to find your daily calorie needs.
- Split Your Macros: Use our Macro Calculator to fill the rest of your calories with carbs and fats.
- Track Your Lifts: Building muscle requires progressive overload. Use our 1RM Calculator to track your strength progress.
Sources & Methodology
- Jäger et al. (2017) — International Society of Sports Nutrition Position Stand: Protein and Exercise. J Int Soc Sports Nutr.
- Morton et al. (2018) — Protein Supplementation and Resistance-Training Adaptations. Br J Sports Med.
- Helms et al. (2014) — Evidence-Based Recommendations for Natural Bodybuilding Contest Preparation. J Int Soc Sports Nutr.
- Mamerow et al. (2014) — Dietary Protein Distribution Positively Influences 24-h Muscle Protein Synthesis. J Nutr.
- USDA FoodData Central — Food Composition Database
Frequently Asked Questions
How much protein do I need per day?
Your daily protein needs depend on body weight, activity, training and goals. The adult RDA is 0.8 g/kg per day (a reference intake intended to prevent deficiency). For most exercising individuals aiming to build or maintain muscle, sports-nutrition guidance commonly cites 1.4–2.0 g/kg per day. Use the calculator for an individualized starting estimate based on your selected goal.
How do I calculate how much protein I need?
Multiply your body weight in kilograms by a protein factor in grams per kilogram. For example, an 80 kg person using the muscle-gain range of 1.4–2.0 g/kg gets approximately 112–160 grams of protein per day. The RepMaths calculator performs this conversion automatically for pounds or kilograms.
How much protein do I need to build muscle?
For most healthy exercising adults, approximately 1.4–2.0 grams of protein per kilogram of body weight per day (0.64–0.91 g/lb) is a commonly cited sports-nutrition range. Resistance training, sufficient energy intake and recovery also matter.
How much protein should I eat per pound of body weight?
The adult RDA is approximately 0.36 g/lb. For muscle gain or maintenance, a commonly cited sports-nutrition range is approximately 0.64–0.91 g/lb. Your appropriate target depends on activity, energy intake and individual circumstances.
How much protein should I eat for weight loss?
Higher protein intake may help support lean-mass retention during a calorie deficit, particularly alongside resistance training. This calculator uses an athlete-oriented cutting range of 1.6–2.4 g/kg of total body weight. Note that some contest-prep research expresses protein targets relative to fat-free mass rather than total body weight. It is not a universal requirement or medical prescription.
Is 1 gram of protein per pound necessary for muscle growth?
No. One gram per pound is a popular fitness guideline, but most exercising adults do not need to reach that exact amount. Research supports useful muscle-related outcomes across a range of intakes, including approximately 1.4–2.0 g/kg per day.
Can my body absorb more than 30 grams of protein per meal?
Yes. The idea that the body cannot absorb more than 30 grams of protein per meal is misleading. Your body can digest and use larger amounts. Total daily intake and a practical distribution across meals are generally more important than a strict 30-gram limit.
How much protein should I eat per meal?
Sports-nutrition research often cites a general range of approximately 0.25–0.4 g/kg of body weight per meal, or roughly 20–40 grams of high-quality protein, to support muscle protein synthesis. This is not a strict rule; individual response varies with body size, age, and training status.
Should I calculate protein using total body weight or lean body mass?
This calculator uses total body weight. For people with substantially higher body fat, a realistic goal weight or an appropriately assessed lean-body-mass approach may provide a more practical estimate. The higher protein recommendations sometimes used for lean, resistance-trained athletes during cutting may be expressed per kilogram of fat-free mass, not total body weight.
How much protein do I need if I weigh 130 pounds?
At 130 lb (approximately 59 kg), the adult RDA (reference intake) is about 47 g/day. The calculator muscle-gain range for exercising adults is approximately 83–118 g/day. Your actual needs depend on your activity, goals and circumstances.
Is whey protein required to reach my daily protein goal?
No. You can meet protein requirements through regular foods such as eggs, dairy, fish, meat, soy, beans and lentils. Whey or other protein supplements are optional conveniences rather than requirements. Because some plant proteins have a lower leucine content or different amino acid profiles, plant-based eaters may benefit from targeting the higher end of the protein range or combining different protein sources.
Is high protein intake safe for kidneys?
In healthy adults with normal kidney function, higher protein intakes (up to ~2.0–2.2 g/kg/day) have not been consistently linked to kidney harm in research. However, this is not a universal safety guarantee. People with chronic kidney disease or other kidney conditions must follow individualized clinical advice from a healthcare professional, as protein intake may need to be strictly controlled.
What should I calculate after my protein target?
Use the TDEE Calculator to estimate maintenance calories, the Macro Calculator to explore protein, carbohydrate and fat targets, the Calorie Deficit Calculator for a weight-loss planning estimate, or the Body Fat Calculator to track body-composition changes.