How Many Grams Of Protein Per Day Calculator: Your Real Number, Not a Guess
Enter your weight, activity level, and goal to get a personalized daily protein range in grams, broken down per meal, and compared against the science-backed guidelines behind each number.
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Everything calculates instantly in your browser. Nothing you enter is stored or sent anywhere.
Use your current body weight. If you know your body fat percentage, entering it below gives a slightly more precise, lean-mass-based number.
Leave this blank if you're not sure. Protein needs are more accurately tied to lean body mass than total weight, so this refines the number for anyone carrying a higher or lower than average body fat percentage.
More frequent or intense training increases the amount of protein your body can put to use for repair and adaptation.
Your goal shifts the target range more than almost any other factor here, since building muscle and preserving it during a calorie deficit both call for noticeably more protein than general maintenance.
Used only to split your total target evenly across meals, which many people find easier to plan around than one large daily number.
Your daily protein target
Fill in your details and press calculate to see your personal range.
Split across your meals
Everyday foods that get you there
| Food | Typical serving | Protein |
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Why "how much protein" almost never has one universal answer
Search for a daily protein number and you'll find wildly different figures, and honestly, most of them are technically correct for someone, just not necessarily for you. The RDA (Recommended Dietary Allowance) of roughly 0.8 grams per kilogram of body weight is the minimum needed to prevent deficiency in a mostly sedentary adult, not the amount that supports muscle growth, recovery from hard training, or the extra needs that come with pregnancy or aging. This how many grams of protein per day calculator exists to close that gap by giving you a real, personalized range instead of one generic figure lifted from a nutrition label.
The science behind the numbers
This calculator's ranges are built on published nutrition research and international guidance rather than a single arbitrary rule of thumb:
How your inputs shape the final range
Your body weight sets the baseline multiplier. Your activity level and goal then shift that multiplier up or down within a range that reflects current sports nutrition and clinical research. If you provide a body fat percentage, the calculator swaps to using your lean body mass instead of total weight for the top end of that range, since muscle tissue is what actually drives protein requirements, not fat mass.
Reading your result breakdown
Once calculated, you'll see a headline number representing a sensible daily target, sitting inside a visual range from the lower, maintenance-style end to the higher, goal-optimized end. Below that, a set of quick stats shows your target in grams per kilogram and per pound, along with an estimate of daily calories the protein alone contributes. Your total is then split evenly across however many meals you eat, and paired with a table of everyday foods and roughly how much of each you'd need to hit that target.
A quick real-world example
Someone weighing around 75 kilograms who trains a few times a week with a muscle-building goal might land somewhere between 120 and 165 grams of protein a day. Spread across four meals, that works out to roughly 30 to 40 grams per sitting, which is easily covered by something like a chicken breast, a serving of Greek yogurt, or a couple of eggs alongside other protein sources through the day, rather than requiring an unrealistic amount of any single food.
Frequently asked questions
How many grams of protein should I eat per day?
It depends on your body weight, activity level, and goal, generally ranging from about 0.8 grams per kilogram for a sedentary adult up to 2.0 grams per kilogram or more for someone actively building muscle or preserving it during fat loss. This calculator gives you a specific range based on your own numbers rather than a single generic figure.
Is more protein always better for building muscle?
No. Protein intake has diminishing returns past a certain point, and most research suggests benefits plateau somewhere around 1.6 to 2.2 grams per kilogram of body weight for muscle growth. Eating far beyond that range doesn't typically add extra muscle-building benefit.
Do I need more protein when trying to lose weight?
Often yes. Higher protein intake during a calorie deficit helps protect lean muscle mass, which is why many fat-loss focused recommendations sit higher than the standard baseline, sometimes reaching close to 2 grams per kilogram of body weight.
How much protein do older adults need?
Research such as the PROT-AGE recommendations suggests adults over 65 generally benefit from higher protein intake than the standard RDA, often in the range of 1.0 to 1.2 grams per kilogram of body weight, to help counter age-related muscle loss.
Should protein needs be based on total body weight or lean body mass?
Lean body mass is generally the more accurate basis, since muscle tissue is what primarily drives protein requirements. Total body weight is a reasonable estimate when body fat percentage isn't known, which is why this calculator uses total weight as the default and refines the estimate if you provide a body fat percentage.
Is it possible to eat too much protein?
For most healthy adults, moderately high protein intake is well tolerated. People with existing kidney conditions should be more cautious with very high protein intakes and should work with a healthcare provider to determine a safe target rather than relying on general calculators.
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This tool provides general nutritional information based on published dietary research and guidelines. It is not personalized medical or dietetic advice. Anyone with kidney disease, another medical condition, or specific nutritional needs should consult a doctor or registered dietitian before making significant changes to protein intake.