How Much Weight to Gain Per Week Bulking (0.25-0.5%)

Gain 0.25 to 0.5 percent of your body weight a week. At 70 kg that is 0.18 to 0.35 kg a week. At 90 kg it is 0.23 to 0.45 kg. In both cases it is under a pound a week, which feels like nothing is happening, and that is roughly how a good bulk is supposed to feel. The rate is the one decision that sets how much of the gain is muscle and how much is fat, and holding it is far cheaper than correcting it six months later.

The arithmetic at two body weights

The range comes from the Iraki review of off-season nutrition for bodybuilders, which puts sensible gain at roughly a quarter to half a percent of body weight a week. Run the multiplication on your own number and it stops being a guideline and becomes a figure you can check on a Sunday.

Held at the middle of the range, a 90 kg lifter gains about 0.34 kg a week, which is 8.8 kg across a six month bulk. A 70 kg lifter at the same relative rate gains about 6.8 kg over the same period. Those are the totals a patient bulk produces, and a good share of each is muscle.

The percentage matters more than any absolute figure, because a bigger body carries more muscle and needs more food simply to stay where it is. A flat half kilo a week sits at the top of the range for a 100 kg lifter and at 0.83 percent for a 60 kg one, which is well past it. This is also why advice borrowed from a much heavier training partner tends to go wrong.

Beginners can sit at the top of the range. Muscle comes faster in the first year, so there is more for the surplus to build. Everyone else is better off near the bottom.

Lean bulk vs dirty bulk

These are two names for the same dial. A lean bulk is a small surplus held at the rate above. A dirty bulk is whatever rate the food happens to produce, which in practice is one percent of body weight a week or more.

What makes the dial matter is that the rate of muscle growth is limited by training and recovery, and eating past that limit does not raise it. Every gram of weekly gain above your muscle-building rate arrives as fat. Double the food and you roughly double the total on the scale while leaving the muscle where it was.

The arithmetic over twelve weeks at 90 kg makes the cost visible. At 0.45 kg a week you finish 5.4 kg heavier. At 0.9 kg a week you finish 10.8 kg heavier on the same training, the same program and, plausibly, the same amount of muscle. The 5.4 kg difference is fat, and you will spend real time removing it.

Removing it is where the bill lands. Garthe and colleagues put elite athletes on two weight loss rates, about 0.7 percent of body weight a week against 1.4 percent, and the slower group finished with more lean mass and better strength and power results. Take the slow route to protect what you built and 5.4 kg at 90 kg runs to roughly eight or nine weeks of eating less. Take the fast route and you pay in strength instead. Either way, the dirty bulk borrowed those weeks from training it will not give back.

One case argues for the higher end of the range: a genuine beginner, or someone who is underweight, both of whom build faster and have more room. If food feels like a fight in either direction, a clinician or a registered dietitian is the right person to talk to, and a percentage on a chart is not a substitute for that.

Why four weeks is the unit

A week of intended gain at 70 kg is 0.18 to 0.35 kg. Stand on the scale two mornings running and the gap between them is routinely larger than that, on food volume, salt, water and where you happen to be in the week. A single weekly reading therefore cannot separate a working bulk from a stalled one. The noise is simply bigger than the signal.

Four weeks changes that ratio. At 70 kg, four weeks at the middle of the range is about 1.1 kg of intended gain. At 90 kg it is about 1.4 kg. Both are large enough to show through the daily swing, which is what makes a four-week comparison an actual measurement rather than a feeling.

The cleanest way to run it: weigh in once a week for four weeks, then compare the average of weeks one and two with the average of weeks three and four. Double that difference and you have your real weekly rate, with most of the water noise cancelled out. Everything before the fourth weigh-in is a work in progress.

Reading the curve

Weigh in on the same morning each week, before breakfast, after the bathroom, in the same clothes. One number a week is plenty. Daily weigh-ins are workable only if you read the weekly average and treat the individual mornings as scenery, which on a bulk is harder than it sounds.

In Strongbro the Body screen holds those weigh-ins as one curve with the distance to your target underneath, so four points show you a slope rather than a number. The weights are typed in by hand, which is a few seconds once a week and the reason the curve stays honest: nothing appears on it that you did not stand on a scale for.

Read the slope, not the last point. A curve that climbs, sits flat for ten days and climbs again is one bulk behaving normally, and the flat fortnight in the middle is what makes people add food they did not need.

When the scale moves and the lifts do not

Body weight cannot tell you what the gain is made of. Strength can, over weeks, which is why the weekly look is two lines rather than one.

Pick three or four lifts, one from each movement pattern you train, and put their estimated one-rep max trend next to the weight curve. Insights computes the estimate from every set you log, and automatic personal records flag it when a best at a given rep count moves, which on a bulk often happens before the bar itself gets heavier. The one-rep max calculator shows how the estimate responds when you add a rep instead of a plate.

Three pictures come out of that comparison:

• Both lines rising. The food is doing its job. Change nothing.
• Both flat for two weeks. Either the surplus is too small or the program never asked for progressive overload. Check the training first, since it costs nothing to check.
• Scale rising for three weeks with the lifts flat. The rate is too high. Take food back out before the mirror confirms it in month four.

Am I bulking or just getting fat works through that weekly comparison in more detail, including which lifts are worth judging it on.

Changing the rate without starting over

Change one thing at a time and give it four weigh-ins. If the measured rate came in under 0.25 percent a week, add one consistent item to the day, roughly a snack, at the same time every day. If it came in over 0.5 percent, take one out. Then wait, because a two-week verdict on a change is a verdict on water.

Two things are worth leaving alone while you wait. The training, so the only variable is the food. And the weigh-in conditions, since switching from an evening reading to a morning one will hand you a fake kilogram in either direction.

The first four weeks

Do the multiplication, write both ends of your range next to the scale, and add one consistent thing to the day. Weigh in four times, always the same morning. Log every set in between, because the second line is the one that tells you what the first line is made of, and a log with gaps cannot draw it. At the fourth weigh-in you will have a real rate and a strength trend to hold it against, and the decision for the next four weeks will be add, hold or trim. That is the whole loop, and it runs for months.

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