Protein Calculator

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.