The definitions
A bulk is a planned period in a calorie surplus with hard training, designed to maximise muscle gain. Some fat gain comes with it; the goal is to keep that small.
A cut is a planned period in a calorie deficit, designed to lose fat while keeping as much muscle as possible.
Maintenance and recomposition sit between the two. Eating around maintenance while training hard can slowly build muscle and lose fat at the same time, particularly for beginners. See our body recomposition guide.
A simple decision rule
| Your situation | Men (body fat) | Women (body fat) | Start with |
|---|---|---|---|
| Higher body fat | Above ~20% | Above ~30% | Cut |
| Moderate | ~13-20% | ~23-30% | Recomp or your preference |
| Lean | Below ~13% | Below ~23% | Lean bulk |
These are practical rules of thumb, not hard thresholds. Not sure where you are? Estimate it with the body fat calculator.
Beyond body fat, ask yourself what would make you happiest in six months. If carrying more fat would make you miserable or less consistent, cutting first is the right call even at moderate body fat. Adherence beats optimisation.
Why lean bulks beat dirty bulks
Muscle can only be built so fast. Eating far beyond what you need does not speed it up much; it just adds fat that you later have to diet off. Studies comparing larger and smaller surpluses in trained lifters have generally found that the bigger surplus mainly adds more fat, with little or no extra muscle to show for it.
That is why most coaches now favour a lean bulk: a small surplus and a slow, steady rate of gain.
How to set up a bulk
- Find maintenance with the TDEE calculator.
- Add a surplus of about 5-10%, roughly 150-300 kcal per day for most people.
- Set protein at 1.6-2.2 g/kg, fat at 20-35% of calories, carbs for the rest. The macro calculator does this for you.
- Weigh daily, compare weekly averages, and adjust by 100-150 kcal if you are outside your target rate.
| Training age | Target gain per month | Example (75 kg lifter) |
|---|---|---|
| Beginner (year 1) | 1-1.5% of bodyweight | 0.75-1.1 kg (1.7-2.5 lb) |
| Intermediate | 0.5-1% | 0.4-0.75 kg (0.8-1.7 lb) |
| Advanced | 0.25-0.5% | 0.2-0.4 kg (0.4-0.8 lb) |
Train with a programme that drives progressive overload, such as push pull legs or an upper/lower split. A surplus without hard training simply makes you fatter.
How to set up a cut
- Start from your maintenance and subtract 15-25%.
- Raise protein toward the top of the range, around 2.0-2.2 g/kg.
- Keep lifting heavy. Your training is the signal that tells your body to keep its muscle; do not switch to light, high-rep "toning" work.
- Aim to lose 0.5-1% of bodyweight per week.
Our calorie guide covers adjusting the deficit as you go, and the weight loss calculator will estimate how long the cut will take.
How long should each phase last?
Bulks tend to work best when they are long, often four to six months or more, because muscle gain is slow and you want enough time for it to accumulate. Cuts are often shorter, typically 8 to 16 weeks, because longer deficits get harder to sustain and start to bite into training quality.
End a bulk when your body fat climbs to a level you are no longer comfortable with, or when your waist has grown noticeably faster than your strength. End a cut when you reach your goal or when you have been dieting long enough that a break at maintenance would help.
A useful sanity check is the ratio of time spent bulking to cutting. If you find yourself cutting for longer than you bulked, the surplus was probably too large. Over a year, most successful lifters spend more time building or maintaining than dieting.
The transition matters
After a cut, raise calories back to maintenance over a week or two and hold there for a few weeks before starting a surplus. Expect the scale to rise 1-2 kg as food volume, water and glycogen return. That is not fat.
After a bulk, there is no need for a dramatic drop. Reduce calories to your new deficit target and keep training the same way.
One more point: your maintenance changes during each phase. After a bulk you are heavier, so your maintenance is higher than when you started; after a cut it is lower. Recalculate with the TDEE calculator at every transition, then confirm the new number with two weeks of scale data before you commit to it.
A year planned out
Here is how a lean-ish intermediate lifter at around 15% body fat might arrange a year. The exact lengths are flexible; the pattern is what matters.
| Months | Phase | Calories | Expected result |
|---|---|---|---|
| 1-5 | Lean bulk | +5-10% | +2-3.5 kg, mostly muscle with some fat |
| 6 | Maintenance | Maintenance | Weight stabilises, recovery improves |
| 7-9 | Cut | -20% | -4-5 kg, body fat back near starting point |
| 10 | Maintenance | Maintenance | Diet break, rebuild training |
| 11-12 | Start next bulk | +5-10% | Gains resume from a leaner base |
The net result over a year is a modest, real gain in muscle at a similar body fat level. That might not sound dramatic, but repeated over three or four years it transforms a physique, which is exactly why patience beats extreme surpluses and crash diets.
Food choices for each phase
During a bulk, the challenge for many people is simply eating enough. Calorie-dense but nutritious foods help: oats, rice, whole milk, nuts, nut butters, olive oil, dried fruit and larger portions of your usual meals. A homemade shake of milk, oats, banana and peanut butter can easily add 600-700 kcal.
During a cut, the challenge flips to managing hunger. Lean proteins, vegetables, potatoes, fruit, soups and high-fibre foods deliver plenty of volume for few calories. Keeping a couple of favourite treats in planned portions often helps you stay on track more than banning them outright.
Signs your phase is going wrong
- Bulk: your waist grows more than about 1 cm for every kilogram you gain, or your lifts are not improving.
- Cut: strength is dropping quickly on most lifts, or you are losing more than 1% of bodyweight per week consistently.
- Both: sleep, mood or recovery are tanking. Pull calories back toward maintenance for a week.
Track three things through any phase: weekly average bodyweight, waist measurement and your main lifts. Together they tell you whether you are gaining muscle or just weight.
Frequently asked questions
Should a skinny-fat beginner bulk or cut?
Usually neither. A beginner with low muscle and moderate body fat tends to do best with recomposition: eating around maintenance with high protein and progressive strength training for the first few months.
How big should a calorie surplus be for bulking?
For most lifters, about 5-10% above maintenance, roughly 150-300 kcal per day. Beginners can use the upper end; advanced lifters the lower end.
Will I lose muscle when cutting?
Not if you keep protein high, keep lifting heavy and avoid very aggressive deficits. Many lifters maintain or even slightly gain strength in a moderate cut.
How long should I bulk before cutting?
Typically four to six months or longer. Short bulks do not give muscle gain enough time to add up, which leads to endless cycling with little progress.
General information for healthy adults, not medical advice. See our medical disclaimer.
