How Long Should a Cut Last? What the Research Says

A cut should last as long as it takes to lose the fat you want at a rate of about 0.5 to 1% of your body weight per week, which for many lifters works out to roughly two to four months. There is no single right length: the amount of fat you have to lose and the pace you choose decide it, and slower cuts tend to protect more muscle.

Start from the rate, not the calendar

Picking a number of weeks first, then cutting as hard as needed to fit, is how cuts go wrong. The research gives a target rate instead.

• About 0.5 to 1% of body weight per week. A review of evidence for natural bodybuilders, in the Journal of the International Society of Sports Nutrition, recommends setting calories so that you lose about 0.5 to 1% of body weight per week to maximize muscle retention.
• Slower kept more muscle in a trial. In a study of 24 elite athletes who lifted four times a week, one group aimed to lose 0.7% of body weight per week and the other 1.4%. Both lost about the same amount of weight, but the slower group took about 8.5 weeks instead of 5.3, and gained lean mass (about 2.1%) while the faster group's lean mass did not change.
• For the general public, the CDC says people who lose weight at a gradual, steady pace of about 1 to 2 pounds a week are more likely to keep it off than people who lose it faster.

So the trade is simple. A faster cut ends sooner. A slower cut takes longer but is kinder to muscle and easier to stick with.

How to work out your cut length

The arithmetic is short:

1. Decide how much weight you want to lose. Be honest about it: the leaner you already are, the less there is to lose.
2. Pick a weekly rate in the 0.5 to 1% range.
3. Divide. Weight to lose divided by weekly loss gives a rough number of weeks.

A worked example, as arithmetic only: someone at 200 lb who wants to lose 15 lb. At 0.5% a week (about 1 lb), that is roughly 15 weeks. At 1% a week (about 2 lb), roughly 8 weeks. Real loss is rarely that tidy. Weekly weight bounces around with water and food, and the body adapts to a long diet in ways that slow loss (more on that below), so treat the result as a planning range, not a deadline.

What the research says about length

The same bodybuilding review notes that competitors traditionally diet for two to four months. It also suggests that diets longer than two to four months, losing about 0.5 to 1% of body weight a week, may be better for keeping lean mass than shorter or more aggressive diets. And it says the length should fit the person: leaner people diet for shorter periods than people with more body fat.

That is the closest thing to a research answer for "how long should a cut last." It is not a hard rule, and it came from people preparing for a contest, but the principle carries over: give yourself enough weeks that you don't need a harsh deficit.

Is a 4 week cut enough?

It can be, if you only have a little to lose. Four weeks at 0.5 to 1% a week is about 2 to 4% of your body weight. If your goal is bigger than that, squeezing it into four weeks means a faster rate than the research recommends for keeping muscle.

When is a cut too long?

There is no proven maximum. What changes over a long diet is that it gets harder. A review on metabolic adaptation in the Journal of the International Society of Sports Nutrition describes how energy restriction brings changes in hormones and energy expenditure that work to shrink the deficit, slow weight loss, and promote regain.

Practical signs a cut has run long: progress has stalled for a couple of weeks in a row, hunger and fatigue are wearing you down, and your training is slipping. A stall isn't always a reason to stop. Our weight loss plateau guide covers how to check whether your deficit has simply closed. If you still have fat to lose but need a rest, a planned week or two at maintenance is an option; our guide to diet breaks and reverse dieting covers what the trials found.

Make the weeks count

How long you cut matters less than what you do during it. Set calories and macros sensibly (our guide to macros for cutting walks through it), keep protein up, and keep lifting. Those habits are what the research ties most closely to keeping muscle; our guide on how to lose fat without losing muscle covers the evidence.

Where Metriq fits

Metriq does the arithmetic for you. On a fat-loss plan, your calorie target sits 15, 20, or 25% below your estimated maintenance depending on the pace you choose, and the app shows a goal date based on the gap between your latest weight and your goal weight at that deficit. Because it measures from your latest weekly weigh-in, the date moves as you make progress instead of staying fixed to day one. See My Numbers →

Frequently asked questions

How long should a cut last?

Long enough to reach your goal at about 0.5 to 1% of body weight lost per week. For many lifters that is around two to four months, which is how long bodybuilders have traditionally dieted. Divide the weight you want to lose by your weekly rate for a rough number of weeks.

Is a 12 week cut too long?

No. Twelve weeks sits inside the two to four month range that bodybuilders have traditionally used, and a review of the evidence suggests longer, slower diets may keep more lean mass than shorter, aggressive ones.

Is a 6 month cut too long?

Not by any research cutoff, but long diets get harder as the body adapts to eating less. If you have that much to lose, planned breaks at maintenance are one option that has been studied.

How fast should I lose weight on a cut?

A review for natural bodybuilders recommends about 0.5 to 1% of body weight per week to maximize muscle retention. The CDC's general guidance for keeping weight off is about 1 to 2 pounds a week.

Should leaner people cut for a shorter time?

Usually, yes. They have less fat to lose, and the bodybuilding review notes that leaner people diet for shorter periods than people with higher body fat.

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This article is educational and general in nature. It isn't personalized medical or nutrition advice. Talk with a qualified professional before starting or changing a diet or training program.

Related: Macros for Cutting: How to Set Protein, Fat, and Carbs · Diet Break vs Reverse Diet: What the Research Shows · How to Lose Fat Without Losing Muscle · Back to the blog

Sources

• Bodyweight loss of about 0.5 to 1% per week to maximize muscle retention (Helms, Aragon & Fitschen, 2014, Journal of the International Society of Sports Nutrition): pubmed.ncbi.nlm.nih.gov/24864135
• Two to four month diets traditional in bodybuilding; diets longer than two to four months at 0.5 to 1% per week may be superior for lean mass retention; leaner competitors diet for shorter periods (same review, full text): pmc.ncbi.nlm.nih.gov/articles/PMC4033492
• 24 elite athletes, target loss 0.7% vs 1.4% of body weight per week; 8.5 vs 5.3 weeks; lean mass +2.1% in the slower group, unchanged in the faster group (Garthe et al., 2011, International Journal of Sport Nutrition and Exercise Metabolism): pubmed.ncbi.nlm.nih.gov/21558571
• Gradual, steady loss of about 1 to 2 pounds a week is more likely to be kept off (CDC, "Steps for Losing Weight"): cdc.gov/healthy-weight-growth/losing-weight
• Energy restriction brings hormonal and energy expenditure changes that minimize the deficit, attenuate weight loss, and promote regain (Trexler, Smith-Ryan & Norton, 2014, Journal of the International Society of Sports Nutrition): pubmed.ncbi.nlm.nih.gov/24571926