Protein for lifters: how much per kg, per day and per meal

Protein for lifters comes down to three numbers: grams per kg of body weight a day, the daily total that gives you, and how that total is split across meals. When gaining or holding weight, eat 1.6 to 2.2 g of protein per kg of body weight a day, which is 160 to 220 g for a 100 kg lifter. On a cut the range is 1.6 to 2.4 g per kg of body weight, or 2.3 to 3.1 g per kg of lean mass if you know your body fat. Spread the total over four or more meals, which for that lifter means roughly 40 to 55 g each.

Those are the ranges the maintenance calorie calculator and the cutting and bulking calculators on this site already use, so the figures below match what the tools print. What this guide adds is the research behind each range, a worked example run through the same code, the meal-timing evidence including a 2023 trial that found no ceiling on a single dose, and the mistakes that cost lifters the most.

Per kg a day: why the range stops at 2.2

Extra protein stops adding lean mass from training at about 1.6 g per kg of body weight a day. That figure comes from a meta-analysis of 49 randomised trials and 1,863 participants, which found that protein supplementation added 0.30 kg of fat-free mass and 2.49 kg to one-rep max strength on average, with the benefit levelling off at 1.62 g per kg a day [1]. The confidence interval around that break point was wide, reaching 2.20 g per kg at the top, and the break point itself did not reach statistical significance [1]. The 2.2 at the top of the range is that upper bound.

Two details matter for how you use it. The range is for gaining or maintaining, and a cut has its own range, covered below. And the effect of extra protein on lean mass fell with age in the same analysis, which the authors read as older adults needing more rather than less [1]. The data does not say how much more, so this guide does not put a number on it.

A per-kg rule scales with the lifter. At 1.6 to 2.2 g per kg, a 60 kg lifter needs 96 to 132 g a day and a 100 kg lifter needs 160 to 220 g, both from the same formula the bulking calculator runs. The old gym rule of 1 g per pound of body weight is 2.2 g per kg, the very top of the range. It is a generous round number rather than a requirement, and on a cut it costs calories a lifter may want for carbs.

Per day on a cut: body weight or lean mass

On a cut, protein goes up, and the better basis for the number is lean mass. A review of protein during weight loss in athletes puts the range at 1.6 to 2.4 g per kg of body weight a day, with the harder deficits and the heavier training at the top [2]. A systematic review of lean, resistance-trained athletes in a deficit found the evidence pointed higher still, at 2.3 to 3.1 g per kg of fat-free mass a day, scaled up with the severity of the deficit and with leanness [3]. The International Society of Sports Nutrition's position stand repeats the same 2.3 to 3.1 figure for lifters in a hypocaloric period [4].

The two bases agree for a lean lifter and drift apart as body fat rises, because fat tissue does not raise your protein need. The cutting calorie calculator switches to the lean-mass range as soon as you enter a body fat figure, and the table below shows why that matters for a 100 kg lifter. Lean mass here is body weight minus fat mass, with nothing else subtracted.

At 15 per cent body fat the lean-mass range runs above the body-weight range, and at 30 per cent it runs below it. The body-weight range quietly assumes a body composition that only some lifters have. If you have a recent body fat estimate, use the lean-mass basis. If you do not, the body-weight range is the honest default [2].

Worked example: a 100 kg lifter at maintenance and on a cut

Take a 100 kg lifter, 183 cm tall, 32 years old, male, on the calculator's active setting and carrying 24 per cent body fat. The maintenance calculator estimates 3,440 kcal a day for him, with a likely range of 3,100 to 3,780, and 76 kg of lean mass. His protein at maintenance is 160 to 220 g a day. The calculators work the rest of the split from the middle of that range, 190 g, with fat at 25 per cent of calories and carbs filling what is left.

Now put him on a cut at 0.7 per cent of body weight a week, the calculator's default pace. His target drops to 2,670 kcal, which is 770 kcal under maintenance, for a loss of 0.7 kg a week and 2.8 kg over four weeks. His protein range moves to the lean-mass basis, 175 to 236 g, and the middle of that is 206 g. Calories fell by 770 and protein rose by 16 g. Carbs took almost the whole cut.

If he bulked instead, at 0.25 per cent a week, the bulking calorie calculator would give 3,720 kcal with the same 190 g of protein and 508 g of carbs. The protein target barely moves between a bulk and maintenance. It moves on a cut, and it moves up.

In the app, the protein target is a number you type in yourself, in grams a day, with an optional second figure for training days that replaces it on days you log a session. The calculators are where to work out what that number should be. The app sets its own calorie targets by a different rule from the pages, so carry the protein figure across and let each tool do its own job.

Per meal: does the split matter?

Less than the daily total, and more than nothing. A 2013 trial gave 23 trained young men 80 g of whey over the 12 hours after a leg session, as eight doses of 10 g, four of 20 g or two of 40 g [5]. Four doses of 20 g every three hours produced the highest rate of muscle protein synthesis, about 31 per cent above the eight small doses and about 48 per cent above the two large ones [5]. The position stand's advice to eat protein every three to four hours follows that pattern [4].

The idea that anything over 20 to 25 g in one sitting is wasted does not follow from it. A review of that ceiling found it rested on fast-digesting protein eaten alone, and that mixed meals and slower proteins change the picture [6]. The authors' working recommendation was about 0.4 g of protein for each kilo of body weight at every meal, across at least four meals, which lands at 1.6 g per kg a day, and up to 0.55 g for each kilo per meal when the daily total is 2.2 [6]. The position stand puts it in absolute terms: 20 to 40 g a meal, every three to four hours, and 30 to 40 g of casein before sleep [4].

A 2023 trial pushed the ceiling further out. Thirty-six recreationally active young men ate 0, 25 or 100 g of labelled milk protein after a whole-body session, and the 100 g dose produced a larger and longer-lasting rise in muscle protein synthesis over the following 12 hours, with only a negligible increase in the amount burned for energy [7]. The authors concluded that the anabolic response to a single dose has no apparent upper limit in size or duration [7]. The trial was acute and in young men only, which the authors say themselves.

For the 100 kg lifter, the arithmetic is the computed daily total divided by the meals he actually eats.

Every row of that table clears the 20 g dose the whey trial found best and reaches or passes the 40 g top of the position stand's per-meal band [4]. Pick the number of meals you will still be eating on a Tuesday in week six. Three big meals that happen beat five neat ones that do not.

Mistakes that cost the most

The first is cutting protein when cutting calories. The deficit is the one time the research asks for more protein per kg, and the leaner you get and the harder the deficit, the higher the figure should sit [3]. In the worked example above the lifter's protein rose by 16 g while his calories fell by 770.

Next comes applying the body-weight range at a high body fat. At 30 per cent body fat a 100 kg lifter's lean-mass range tops out at 217 g, while the body-weight range runs to 240 g. The extra 23 g does no harm, but it is calories that could have gone to carbs under the bar. Enter your body fat into the cutting calculator and let it switch bases for you.

Reading 1.6 g per kg as a ceiling is the third. It is the best estimate of where extra protein stopped helping in people at maintenance, with a confidence interval that reached 2.2 and a break point that did not reach significance [1]. Treat it as the floor of a range, and go to the top of the range when calories are short.

The fourth is counting a protein shake and a meal as the same thing when planning the split. The 20 g doses that worked in the whey trial were whey alone, which digests fast [5]. The review of that ceiling argues that slower proteins and mixed meals change the picture, which is one reason the per-meal limit is less strict than the shake data suggests [6]. Count the grams, not the sittings.

What the research leaves open

Three things, stated plainly. The 1.6 g per kg plateau comes from a break-point analysis that did not reach significance, so the true plateau could sit anywhere in a wide band [1]. The lean-mass range for a cut was built from six studies, and its authors wrote it as a range to scale with the deficit rather than a single target [3]. And the no-ceiling result is one acute trial in young men over 12 hours, which tells you a 100 g meal is not wasted but not yet whether it builds more muscle over a block of training [7].

None of that changes what to do this week. Set the daily total from the range that matches your phase, split it over the meals you will actually eat, and revisit it when your body weight or your phase changes. If you are not sure whether you should be cutting or gaining at all, the cut or bulk check settles that first.

Questions

Is 1 g of protein per pound of body weight too much?

Not too much, just generous. One gram per pound is 2.2 g per kg, which is the top of the range where extra protein stopped adding lean mass in a meta-analysis of 49 trials [1]. A lifter at maintenance can eat it without harm. On a cut it is a reasonable place to be, since protein needs rise in a deficit [2].

Do I need protein right after training?

Nothing here says you do. The trials measured spacing, not a post-workout window. In the 12-hour whey trial, 20 g every three hours beat two doses of 40 g and eight of 10 g [5]. The position stand's advice is 20 to 40 g every three to four hours [4]. A meal within a few hours of training fits that pattern, and the daily total is the number the research ties to lean mass [1].

How much protein can the body use in one meal?

More than the old 20 to 25 g figure. That ceiling came from fast-digesting protein eaten alone [6]. In a 2023 trial, 100 g of milk protein after training raised muscle protein synthesis for longer and by more than 25 g did, with almost none of the extra burned for energy [7]. A big meal is not wasted. Spreading protein out still helps, but one missed meal does not undo the day.

Should protein go up or down on a cut?

Up. Lifters in a deficit do best at 2.3 to 3.1 g per kg of lean mass a day, with the higher end for leaner lifters and steeper deficits [3]. Without a body fat figure, 1.6 to 2.4 g per kg of body weight is the range to use [2]. For a 100 kg lifter at 24 per cent body fat that is 175 to 236 g, more than his 160 to 220 g at maintenance.