Protein Calculator
Calculate your ideal daily protein intake based on your weight, activity level, and fitness goal — with per-meal breakdown and food source guide.
Your Details
Quick Tips
- Spread protein evenly across all meals for best muscle protein synthesis.
- Add body fat % for a lean-mass calculation — especially useful if you carry more fat.
- Hydration matters: drink at least 500 ml extra water per 50 g of protein consumed.
Your Daily Protein Target
RDA Minimum
62 g
0.8 g/kg body weight
Per Meal (4×)
35–39 g
split evenly
Protein Breakdown
Target vs. RDA
Important Note
These targets are evidence-based estimates for healthy adults. Individual needs vary based on medical history, medications, and specific training programs. Consult a registered dietitian or physician for personalized guidance.
What Is a Protein Calculator?
A protein calculator estimates how much dietary protein you need each day based on your personal characteristics — primarily body weight, physical activity, and fitness goal. Protein is the most critical macronutrient for muscle repair, immune function, enzyme production, and hormone regulation. Yet most people either consume too little to support their training or too much without realizing it adds unnecessary calories.
Unlike generic advice to "eat more protein," a personalized protein calculator accounts for the fact that a 130-pound sedentary woman has fundamentally different needs than a 200-pound competitive powerlifter. The tool above uses evidence-based multipliers drawn from sports nutrition research to give you a specific gram target — along with a practical per-meal breakdown — so you can plan your diet with confidence.
Protein is made up of amino acids, nine of which are essential and must come from food. Animal proteins (meat, eggs, dairy) are "complete," meaning they contain all nine. Most plant proteins are incomplete but can be combined to cover all amino acids. Regardless of source, meeting your daily protein target consistently is the single most important dietary habit for body composition and long-term health.
How to Calculate Your Daily Protein Needs
The standard approach is to multiply a protein ratio (in grams per kilogram of body weight) by your body weight in kilograms. The ratio changes based on activity level and goal:
Core Formula
Daily Protein (g) = Body Weight (kg) × Ratio (g/kg)
Body Weight (kg) — total weight, or lean body mass if body fat % is known
Ratio (g/kg) — ranges from 0.8 (sedentary/RDA) to 2.6 (competitive athlete building muscle)
For a more accurate result, use lean body mass (LBM) instead of total body weight. LBM = Total Weight × (1 − Body Fat%). Fat tissue is metabolically inactive relative to muscle and does not require protein for maintenance. Using LBM as the base prevents overestimating protein needs in individuals carrying significant body fat.
Lean Mass Formula
LBM (kg) = Total Weight (kg) × (1 − Body Fat% / 100)
Daily Protein (g) = LBM (kg) × Ratio (g/kg)
Finally, divide your daily target by the number of meals you eat to get a per-meal protein goal. Research suggests that 20–40 g per meal maximally stimulates muscle protein synthesis in most adults — though older adults may need more per meal (40+ g) due to "anabolic resistance" that develops with age.
Protein Targets by Fitness Goal
Your protein target is not one-size-fits-all. Research consistently shows different optimal ranges depending on whether you are maintaining weight, cutting fat, or building muscle.
| Goal | Recommended Range | Why It Matters |
|---|---|---|
| Maintain Weight | 1.0–1.8 g/kg | Preserves lean mass and supports recovery from daily activity |
| Lose Body Fat | 1.2–2.4 g/kg | Higher protein prevents muscle loss during a calorie deficit and increases satiety |
| Build Muscle | 1.4–2.6 g/kg | Maximizes muscle protein synthesis; upper range for advanced lifters in hypertrophy phases |
| RDA (Minimum) | 0.8 g/kg | Prevents deficiency in sedentary adults; not optimal for performance or aging |
| Older Adults (65+) | 1.2–1.6 g/kg | Counteracts sarcopenia (age-related muscle loss) and supports bone density |
Worked Examples
Let's walk through three realistic scenarios so you can see exactly how the calculation works.
Example 1 — 150 lb Woman, Moderate Activity, Fat Loss
Weight: 150 lbs ÷ 2.205 = 68 kg. Fat-loss ratio for moderately active: 1.6–1.8 g/kg.
Daily target: 68 × 1.6 = 109 g to 68 × 1.8 = 122 g.
Split across 4 meals: 27–31 g per meal. She could achieve this with two chicken-breast meals, a Greek yogurt snack, and a protein shake.
Example 2 — 200 lb Man, Active, Building Muscle (with 18% body fat)
Total weight: 200 lbs = 90.7 kg. Body fat 18% → lean mass = 90.7 × (1 − 0.18) = 74.4 kg.
Muscle-building ratio for active: 2.0–2.2 g/kg.
Daily target: 74.4 × 2.0 = 149 g to 74.4 × 2.2 = 164 g. Across 5 meals: 30–33 g per meal.
Example 3 — 130 lb Beginner, Sedentary, Maintain Weight
Weight: 130 lbs = 59 kg. Maintain/sedentary ratio: 0.8–1.0 g/kg.
Daily target: 47–59 g/day. At just 3 meals, that is 16–20 g per meal — easily achievable with two eggs and a cup of cottage cheese per meal.
Top Protein Food Sources
Knowing your protein target is only half the battle — you also need to know which foods deliver protein most efficiently. Here are the most protein-dense options ranked by protein per serving:
| Food | Serving Size | Protein |
|---|---|---|
| Chicken Breast (cooked) | 100 g | 31 g |
| Whey Protein Powder | 1 scoop (30 g) | 25 g |
| Canned Tuna | 100 g | 26 g |
| Eggs (large) | 1 egg | 6 g |
| Greek Yogurt (plain, non-fat) | 170 g | 17 g |
| Cottage Cheese (low-fat) | 100 g | 11 g |
| Salmon (cooked) | 100 g | 25 g |
| Beef (lean ground, cooked) | 100 g | 26 g |
| Lentils (cooked) | 100 g | 9 g |
| Tofu (firm) | 100 g | 8 g |
For those following a plant-based diet, combining legumes with grains (e.g., lentil soup with rice, or hummus on whole-grain bread) provides all essential amino acids. Soy products like tofu, tempeh, and edamame are the most complete plant proteins and can substitute for animal sources in nearly any meal plan.
Tips for Hitting Your Daily Protein Target
Consistently reaching your protein goal is easier with a few practical strategies:
- Anchor every meal with a protein source. Plan your meals around the protein (chicken, eggs, fish, tofu) and fill in carbs and fat around it — rather than adding protein as an afterthought.
- Batch cook proteins once a week. Grill or bake a large batch of chicken, hard-boil a dozen eggs, or cook a pot of lentils. Having ready-to-eat protein eliminates the biggest barrier: preparation time.
- Use protein powder strategically. Whey or plant-based protein powder is not a necessity, but it is a convenient tool when you are 20–30 g short of your daily target or need a fast post-workout meal.
- Track for 2–3 weeks, then recalibrate. Use an app like Cronometer or MyFitnessPal for a few weeks to understand your baseline intake. Once you know your habits, you can often hit your target without daily logging.
- Reassess every 3 months. As you lose fat or gain muscle, your body weight and lean mass change — meaning your protein target changes too. Recalculate every quarter or whenever your weight shifts by more than 5 lbs (2.3 kg).
Frequently Asked Questions
About This Calculator
Free protein calculator: find your daily protein intake based on weight, activity level, and fitness goal. Includes per-meal breakdown and top food sources.
Frequently Asked Questions
How accurate is the Protein Calculator compared to clinical measurements?
This calculator uses peer-reviewed medical formulas that provide reliable estimates for most adults. However, individual results can vary based on factors not captured by standard formulas, including body composition, genetic factors, medical conditions, and medications. These calculations are screening tools, not diagnostic instruments. For medical decision-making, always consult your healthcare provider who can consider your complete health history, perform physical examinations, and order appropriate lab tests for definitive measurements.
Should I consult a doctor before acting on these results?
Yes, we recommend discussing any health-related calculations with your healthcare provider before making significant changes to your diet, exercise routine, or health management plan. This calculator provides educational estimates based on population-level research and standard medical formulas. Your individual health needs may differ due to pre-existing conditions, medications, allergies, pregnancy, age-related factors, or other personal health variables. Your doctor can interpret these results in the context of your complete medical history and provide personalized recommendations.
What factors can make my results different from what this calculator shows?
Several factors can cause your actual values to differ from calculated estimates: age and sex (formulas may use population averages), body composition (muscle vs fat ratio affects many health metrics), genetics and family history, current medications (some affect metabolism, blood pressure, or cholesterol), chronic conditions (diabetes, thyroid disorders, kidney disease), altitude and climate, hydration status, time of day when measurements are taken, and recent food intake or exercise. For the most accurate baseline, take measurements at the same time each day under consistent conditions.
How often should I recalculate or recheck these health metrics?
For general wellness monitoring, recalculate monthly if you are actively working toward a health goal (weight loss, fitness improvement, dietary changes). For stable health maintenance, quarterly checks are sufficient. If you have a chronic condition being monitored by your doctor, follow their recommended schedule — typically every 3-6 months. Track your results over time to identify trends rather than focusing on single measurements, as daily fluctuations are normal for most health metrics.
Are the formulas used in this calculator evidence-based?
Yes, this calculator uses formulas derived from peer-reviewed medical research and endorsed by major health organizations. The specific equations are widely used in clinical practice and have been validated across diverse populations. However, no single formula is universally accurate for every individual — most health formulas were developed using study populations that may not perfectly represent your demographics. We cite the source formula where applicable so you can review the original research and discuss methodology with your healthcare provider.
Sarah brings a public health background to SuperCalc's health and fitness calculators. She translates clinical formulas into accessible tools backed by peer-reviewed research.
- MPH, Columbia University
- Former health data analyst at CDC
- Published health literacy researcher