Protein Calculator

Enter your weight, height, activity level, and fitness goal above to calculate your daily protein intake. This protein calculator uses body weight formulas recommended by sports nutrition research to estimate how many grams of protein you need per day. You can calculate protein needs in seconds. Your results include a personalized gram target, a breakdown across four meals, and a list of high-protein foods to help you reach that number. Whether your goal is weight loss, muscle gain, or general health, your protein requirement depends on several factors that a simple "1 gram per pound" rule does not capture.

How Much Protein Do You Need Per Day?

The baseline recommendation from the National Academy of Medicine is 0.8 grams of protein per kilogram of body weight for sedentary adults. For a 70 kg (154 lb) person, that equals about 56 grams per day. This amount prevents deficiency, but it falls short of what most active people or anyone with a body composition goal actually needs.

Research published in the Journal of the International Society of Sports Nutrition recommends higher ranges based on activity and goal. Moderately active adults benefit from 1.2 to 1.4 g/kg. Endurance athletes perform better at 1.4 to 1.6 g/kg. Strength athletes and people focused on muscle gain need 1.6 to 2.2 g/kg. During a calorie deficit for weight loss, protein needs increase further to 1.8 to 2.4 g/kg to preserve lean muscle mass while losing fat.

Here is a concrete example. A 80 kg (176 lb) man who lifts weights four times per week and wants to build muscle should aim for 1.8 g/kg x 80 = 144 grams of protein per day. Split across four meals, that is 36 grams per meal, roughly equal to 150 grams of chicken breast or three large eggs plus a protein shake.

How Does a Protein Intake Calculator Estimate Your Target?

The calculator above applies a multiplier to your body weight based on two variables: your activity level and your primary goal. The formula structure is straightforward: Daily Protein (g) = Body Weight (kg) x Activity-Goal Multiplier. The multiplier ranges from 0.8 for sedentary maintenance up to 2.4 for intense training during a cut.

If you entered your weight in pounds, the calculator first converts it to kilograms (divide by 2.205), then applies the appropriate multiplier. It also factors in body composition when possible. Two people who weigh the same but carry different amounts of muscle and fat have different protein needs. A person with higher body fat benefits from calculating protein based on lean body mass rather than total weight, since fat tissue does not require protein for maintenance the way muscle does.

Your results also include a four-meal distribution plan. Spreading protein evenly across meals (rather than loading it all into dinner) supports better muscle protein synthesis throughout the day. Research from the University of Texas found that equal protein distribution triggered 25% more muscle protein synthesis than an uneven pattern with the same total grams.

Protein for Weight Loss vs. Muscle Gain: What Changes?

Your fitness goal shifts your protein target significantly. For weight loss, you need more protein than you might expect. When you eat fewer calories than you burn, your body can break down muscle along with fat. A higher protein intake (1.8 to 2.4 g/kg) signals your body to preserve lean tissue and burn fat preferentially. Protein also increases satiety more than carbs or fat, which makes sticking to a calorie deficit easier. A 65 kg woman cutting calories to lose weight should aim for at least 117 to 130 grams per day.

For muscle gain, the sweet spot sits between 1.6 and 2.2 g/kg. Going above 2.2 g/kg shows minimal additional benefit in most studies. The key for muscle growth is not just total protein but combining adequate protein with a slight calorie surplus and progressive resistance training. If you already know your calorie target, use our Macro Calculator to split those calories into protein, carbs, and fat based on your training style.

For general maintenance, 1.0 to 1.4 g/kg supports daily recovery and overall health without requiring strict meal planning. Older adults (over 60) benefit from the higher end of this range because aging muscles respond less efficiently to protein, a phenomenon called anabolic resistance. Aiming for 1.2 to 1.6 g/kg can help seniors maintain strength and mobility over time.

Best Food Sources to Hit Your Daily Protein Target

Meeting a protein goal of 120 to 160 grams per day requires planning, especially if you rely only on whole foods. Animal sources deliver the highest food protein density per serving. A 150-gram chicken breast provides about 46 grams. Two large eggs give you 12 grams. A 200-gram serving of Greek yogurt adds 20 grams. A can of tuna (140 g) contains roughly 30 grams.

Plant-based options take more volume but can still reach high totals. Lentils deliver about 18 grams per cooked cup. Tofu provides 20 grams per 200-gram block. Chickpeas offer 15 grams per cup. Combining legumes with grains (rice and beans, peanut butter on whole wheat) creates a complete amino acid profile comparable to animal protein.

• Highest protein per calorie: chicken breast, turkey breast, egg whites, shrimp, cod, tuna
• Best plant sources: lentils, chickpeas, tofu, tempeh, edamame, seitan
• Convenient supplements: whey protein (24 g per scoop), casein protein (24 g), pea protein (22 g)

If you want to see how protein fits alongside your carb and fat targets, our Calorie Calculator helps you set your daily calorie budget first, and the TDEE Calculator estimates your total daily energy expenditure based on your specific activity pattern.

Common Protein Myths That Lead to Wrong Calculations

The most persistent myth is that eating more than 30 grams of protein per meal is "wasted." Your body does not stop absorbing protein after a fixed threshold. A 2018 study in the Journal of the International Society of Sports Nutrition confirmed that larger protein doses are fully digested and used; they simply take longer to process. Meal timing matters less than your total daily intake.

Another common mistake is assuming that every person of the same weight needs the same protein. A 90 kg person at 15% body fat carries roughly 76 kg of lean mass, while a 90 kg person at 35% body fat carries about 58 kg. Their protein needs differ by nearly 30%. This is why the calculator above asks for your goal and activity level rather than relying on weight alone.

A third misconception is that high protein intake damages kidneys in healthy individuals. Multiple long-term studies, including a 2016 meta-analysis in the British Journal of Sports Medicine, found no evidence of kidney harm from high-protein diets (up to 2.5 g/kg) in people without pre-existing kidney disease. If you have diagnosed kidney issues, consult your doctor before increasing protein.

This calculator provides estimates for informational purposes only and is not a substitute for professional medical advice. Consult a healthcare provider or registered dietitian before making changes to your diet, exercise routine, or treatment plan.

Frequently asked questions