Protein Intake Calculator
Estimate your daily protein target in grams based on your body weight and goal.
How much protein do you actually need?
Daily protein needs vary widely depending on activity level and goals. For general health, many guidelines suggest around 0.36 grams per pound of body weight — the low end of what's needed to avoid deficiency. But that number climbs substantially for anyone exercising regularly, since resistance training and cardio both increase the body's need for amino acids to repair and adapt tissue. This calculator uses commonly-cited ranges: roughly 0.36g/lb for general health, 0.6g/lb for people who exercise regularly, 0.8g/lb for those actively building muscle, and up to 1.0g/lb for aggressive fat-loss phases where preserving lean mass is the priority.
Why protein needs increase with training and dieting
When you strength train, you create small amounts of muscle damage that your body repairs using dietary protein — more training volume generally means more repair demand. Protein also carries a higher "thermic effect" than carbs or fat (your body burns more calories digesting it) and is the most satiating macronutrient, which is part of why higher protein intakes are often recommended during a calorie deficit: it helps preserve muscle mass and control hunger even while eating less overall. If you're cutting calories, pairing a protein calculator with our calorie deficit calculator can help you build a complete daily target.
Spreading protein across the day
Research suggests that spreading protein intake across 3-5 meals, rather than loading it all into one, may support muscle protein synthesis more effectively than eating it all at once. This calculator shows a simple per-meal breakdown assuming four meals a day, but the exact number of meals matters less than hitting your total daily target consistently. This tool provides a general estimate only and is not medical or nutritional advice; consult a registered dietitian or physician for guidance tailored to your health history.
Frequently Asked Questions
How much protein should I eat per day?
It depends on your activity level and goals. General guidelines range from about 0.36g per lb of body weight for sedentary adults up to 0.8-1.0g per lb for people actively training or dieting down while trying to preserve muscle. Select your goal above to see a personalized estimate.
Do I need more protein when I'm in a calorie deficit?
Yes — many coaches and researchers recommend increasing protein intake toward the higher end of the range (around 1.0g/lb) while cutting calories, since it helps preserve lean muscle mass and keeps you fuller on fewer total calories.
Can eating too much protein be harmful?
For most healthy adults, higher protein intakes within the ranges shown here are considered safe. People with pre-existing kidney conditions should consult a doctor, since protein metabolism places additional load on the kidneys.
How many calories are in a gram of protein?
Protein provides 4 calories per gram, the same as carbohydrates. This calculator multiplies your gram target by 4 to show how many total daily calories come from protein.
Should I spread protein evenly across meals?
Some research suggests spreading protein across 3-5 meals a day may support muscle protein synthesis slightly better than eating it all in one sitting, though hitting your total daily target matters more than the exact meal timing.
Is this protein calculator based on body weight or lean body mass?
This calculator uses total body weight for simplicity, since that's the most common way protein recommendations are cited. People with a higher body fat percentage may find that basing protein needs on lean body mass gives a slightly more precise number.
Does more protein automatically build more muscle?
No — protein intake supports muscle growth, but resistance training and adequate total calories are the primary drivers. Consuming protein far beyond your target won't accelerate muscle gain once your needs are already met.
Is this a medical recommendation?
No. This tool provides a general estimate based on commonly-cited protein guidelines and is not medical or nutritional advice. Speak with a registered dietitian or physician about your individual needs, especially if you have a medical condition.