Protein Intake Calculator: Your Daily Target

Of all the dietary advice that surrounds weight loss, the guidance on protein is among the best supported and the most often ignored. When you eat at a deficit, your body draws energy from both fat and lean tissue, and the balance between the two is not fixed. Two levers tip it toward fat: resistance exercise and adequate protein. Get enough of both and most of what you lose is fat; neglect them and a meaningful share can be muscle, which is exactly what you do not want to give up.

How to use this calculator

In the tool above, enter your weight, choose a goal, and set how many meals you eat in a day. The calculator returns a daily protein target in grams, a per-meal figure to spread it across the day, and the typical range for your body weight. Switch between metric and imperial units with the toggle. The per-meal number matters because protein is used most efficiently when distributed, rather than loaded into a single meal.

Where the targets come from

The numbers rest on grams of protein per kilogram of body weight. For general health and maintenance, around 1.2 grams per kilogram is a reasonable floor, already above the bare minimum set by dietary reference intakes. For weight loss, the evidence on preserving lean mass points higher, to roughly 1.6 grams per kilogram. And when appetite is suppressed and intake falls hard, as it does on a GLP-1, aiming toward 2.0 grams per kilogram provides a protective margin. These are not arbitrary; the 1.6 to 2.0 band is where most of the muscle-preservation research during energy restriction sits. The practical strategies for hitting it are covered in our guide to protein targets on GLP-1.

Why the target rises when you eat less

It seems paradoxical that eating less should require proportionally more protein, but it follows directly from the biology. The larger the calorie deficit, the greater the pressure on the body to break down tissue for energy, and the more protein is needed to counter that pressure and signal the body to spare muscle. A GLP-1 medication creates exactly this situation: a sharp, sustained drop in intake. Without a deliberate protein focus, some of the resulting weight loss shows up on the scale as lost muscle, a risk examined in depth in our article on whether GLP-1 medications cause muscle loss.

Protein and staying full

Muscle preservation is the headline reason to prioritize protein, but it is not the only one. Protein is also the most satiating of the macronutrients, meaning it does more per calorie to quiet hunger than fat or carbohydrate. On a GLP-1 that effect compounds with the medication, and even off one it makes a deficit easier to sustain. The mechanisms behind why some foods hold hunger at bay longer than others are explored in our piece on the science of satiety. In practice, building meals around a protein source is one of the highest-leverage habits available, whether or not you are on medication, a point we return to in GLP-1 versus traditional weight loss.

Making the number real

A target is only useful if it is hit consistently, and protein is easy to underestimate. Most people eat far less than they assume, particularly when appetite is low and a few small meals replace larger ones. The per-meal figure this calculator provides is meant to make the goal concrete: a fixed amount to anchor each meal around, so that by the end of the day the total takes care of itself. When appetite is working against you, that structure is what keeps muscle on your frame while the fat comes off.