Protein Calculator
Determine your optimal daily protein intake based on body weight, activity level, and fitness goals.
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About the Protein Calculator
Protein is the nutrient most people under-eat and most worth getting right. It builds and repairs muscle, keeps you feeling full, supports your immune system and helps preserve muscle during weight loss. This calculator estimates how much protein you need each day based on your weight, activity level and goals, so you have a clear target rather than a vague sense that you should eat more of it.
In my experience, hitting a sensible protein target is one of the highest-impact changes a person can make, whether the goal is fat loss, building muscle, or simply feeling satisfied by meals. A real number turns good intentions into something you can actually plan around.
Why protein matters so much
Protein does the structural work in your body: it builds and repairs muscle and tissue, and it provides the amino acids your body cannot make on its own. It is also the most satiating of the three macronutrients, meaning it keeps you fuller for longer, which is genuinely helpful for managing appetite. And during weight loss, adequate protein is what protects your muscle so the weight you lose is mostly fat.
How much you actually need
The bare minimum to avoid deficiency is around 0.8 grams per kilogram of body weight, but that is a floor, not an optimal target. For active people, those building muscle, or anyone losing weight, research supports considerably more, often in the range of 1.6 to 2.2 grams per kilogram. The calculator tailors a target to your weight, activity and goal, which is far more useful than a single blanket number.
Spreading it through the day
It is not just the daily total that matters; distribution helps too. Your body uses protein best when it is spread across meals rather than crammed into one, so aiming for a solid serving of protein at each meal (roughly 25 to 40 grams) is a practical approach. This steady supply supports muscle maintenance and keeps you satisfied between meals, which makes the whole day easier to manage.
Good sources for any diet
Animal foods (chicken, fish, eggs, dairy, lean meat) are protein-dense and complete. Plant eaters can hit their target too, with beans, lentils, tofu, tempeh, edamame, seitan and a mix of whole grains and seeds; combining varied plant sources covers all the amino acids over a day. If you struggle to reach your number from food alone, a simple protein supplement can bridge the gap, but food first is my usual advice.
Sources & method
This calculator uses established, peer-reviewed formulas and reference ranges from recognized health and nutrition authorities. Results are estimates for general education, not a medical diagnosis. For decisions about your health, consult a qualified clinician. Reviewed by Macro & Meals Editorial Team, Content editor.
Frequently Asked Questions
The minimum to avoid deficiency is about 0.8 grams per kilogram of body weight, but that is a floor. Active people, those building muscle, and anyone losing weight benefit from more, often 1.6 to 2.2 grams per kilogram. The calculator tailors a target to your weight, activity and goal.
Protein is the most filling macronutrient, so it helps control appetite, and it preserves muscle during a calorie deficit so the weight you lose is mostly fat. That muscle protection is what keeps your metabolism healthier and changes how you look and feel, beyond the scale.
Yes, it helps. Your body uses protein best when it is spread across meals rather than concentrated in one, so aiming for roughly 25 to 40 grams at each meal supports muscle maintenance and keeps you satisfied between meals, making your daily target easier to hit.
Absolutely. Beans, lentils, tofu, tempeh, edamame, seitan, whole grains, nuts and seeds all contribute, and combining varied plant sources across the day covers all the essential amino acids. A protein supplement can help bridge any gap, though food sources should come first.
