Cut first if your waist is at or above half your height, or if carrying less fat is what you want most in the next few months. Bulk if your waist is comfortably under half your height, you have lifted consistently for a while, and your lifts have slowed down. If you are new to lifting and sit between the two, which is where most people who call themselves skinny fat land, you usually don't have to pick: eat around maintenance, lift hard, and let the first months build muscle while your waist comes down a little.
ChatRPE helps you make that call from your own numbers rather than a mirror. You tell it your weigh-ins, your waist and your sets in plain sentences, and it charts them together so you can see which direction they point.
The three questions that decide it
How much fat are you carrying around your middle?
Measure your waist midway between your lowest rib and the top of your hip bone, breathing out normally, and divide it by your height. UK guidance from NICE puts a ratio of 0.5 to 0.59 at increased health risk and 0.6 or more at high risk. If you are at 0.5 or above, a cut comes first: you have fat worth losing for its own sake, and a surplus would add to it.
How long have you been lifting, and are your lifts still climbing?
A beginner on a sensible program usually gains strength week to week while eating at maintenance. A lifter a couple of years in whose top sets have stalled for months usually needs more food to keep building. The progressive overload guide covers what a stall looks like in a log.
What do you want in three months?
Bigger lifts and more muscle point toward a bulk. A smaller waist, looser clothes or a health marker point toward a cut. Wanting both at full speed is the one answer the plan can't deliver, so choose the one you would be more disappointed to miss.
Why your starting point changes the answer
Your current body fat shapes what a surplus or a deficit does. A review by Gilbert Forbes found that when weight changes, the share of it that is lean tissue depends on how much fat a person starts with. Leaner people put a larger share of a weight gain into lean tissue, and they also lose a larger share of lean tissue when they diet.
That pattern explains the usual coaching advice. Someone lean has more to gain from a surplus and more to lose from a hard cut, so a bulk makes sense and any cut should be short and gentle. Someone with more fat to lose keeps lean tissue more easily in a deficit, so cutting first costs little and removes fat that would otherwise grow during a bulk.
Many coaches put the switch point at roughly 15% body fat for men and 25% for women: below it, bulk; above it, cut. Treat those as rules of thumb, not research cutoffs. Home body-fat estimates are off by several percentage points, which the guide to measuring body fat at home explains, so a reading of 16% versus 14% doesn't settle anything. Waist-to-height ratio is cruder but easier to repeat the same way every time.
If you're skinny fat
"Skinny fat" is not a medical term. People use it for a normal or low bodyweight with little visible muscle and some softness around the middle. Both obvious plans look bad from there. A cut takes an already light frame lower and leaves you smaller. A bulk adds fat to the waist that is the reason you're unhappy.
For a beginner, the answer is usually neither. Lifting is a new stimulus, and new or returning lifters are the people most likely to gain muscle while losing a little fat. Run that for eight to twelve weeks:
- Eat at about maintenance. If your waist is at 0.5 of your height or above, take a small deficit instead.
- Eat 1.6 to 2.2 g of protein per kg of bodyweight a day, roughly 0.7 to 1 g per pound. The protein calculator scales it to your weight.
- Lift three days a week with weights that get heavier over time. The beginner workout plan is a full-body starting point.
Expect the scale to sit roughly flat while your waist drifts down and your lifts go up. The body recomposition guide covers who that works for and how long it tends to keep paying.
When the three-month check shows lifts still rising and waist steady or lower, keep going. When lifts slow and your waist is under half your height, start a lean bulk. When your waist hasn't moved and you're still above half your height, run a short cut.
Read your first month before you decide again
Whichever way you go, the first two weeks mislead. A bulk adds glycogen, water and food volume, often one to three pounds in the first week or two, and a cut drops the same things. Judge the plan on weeks three to six, from three numbers logged in one place.
Log weigh-ins as messages ("172.4 this morning"), your waist as a weekly entry ("waist 35 inches"), and sets as you train ("squat 185 for 5, 5, 5"). Waist is a custom metric that charts like bodyweight; the custom data tracking guide covers keeping it consistent. Then ask:
"Chart my bodyweight with a 7-day moving average and a trend line for the last six weeks, with my waist on the right axis. Then chart my squat estimated 1RM over the same weeks."
The trend line's legend shows the rate as a change per week, such as "+0.3/wk", in the unit you logged. The moving average covers seven weigh-ins, which is a week only if you weigh in daily. Estimated 1RM is calculated from the weight and reps you already logged when the chart is drawn, so you never save it as its own entry.
What the three lines should do:
| You chose | Weight trend | Waist | Lifts |
|---|---|---|---|
| Lean bulk | Up 0.25 to 0.5% of bodyweight a week | Rising slowly, if at all | Rising |
| Cut | Down 0.5 to 1% of bodyweight a week | Falling | Holding or rising |
| Recomposition | Roughly flat | Falling slowly | Rising |
The bulk rate comes from a review of off-season bodybuilding nutrition, and the cut rate from a review of contest preparation. A waist growing faster than your lifts on a bulk means the surplus is too big. Lifts dropping for a couple of weeks on a cut means the pace is too fast or protein is too low.
To keep the check from depending on memory, ask for a weekly nudge with a condition, for example: "Every Sunday at 6 pm, remind me to review my bulk, but only if my average weight this week is above 180 lb." It counts the weigh-ins logged that week in your time zone, so it stays quiet when you're under the line. It arrives as a push notification, which needs the iPhone app with notifications on.
How long each phase should run
A cut is easier to hold for weeks than months. At 0.5 to 1% a week, eight to twelve weeks takes off roughly 4 to 12% of your bodyweight, which covers most of what a lean-ish person wants before a bulk. The guide to losing weight without losing muscle covers the pace and protein that protect muscle on the way down.
Give a bulk an end before it starts: a date a few months out, a target weight, or a waist number you won't pass. When you reach it, hold at the new maintenance for a few weeks before deciding again. The guide to gaining weight covers sizing the surplus from your own logs.
Swinging between the two every month gives neither enough time to show up in the trend. One direction for eight to twelve weeks, then a fresh look at the same three questions, beats changing course whenever the mirror disagrees.
If you are underweight, managing a condition or medication that affects your weight or appetite, pregnant, or have a history of disordered eating, set the direction with a clinician. ChatRPE gives general coaching, not medical advice.
Frequently asked questions
Should I bulk or cut first as a beginner?
Often neither. If your waist is under half your height, eat around maintenance with high protein and lift three days a week; beginners commonly gain muscle and lose a little fat at the same time. If your waist is half your height or more, cut first at a modest pace and keep lifting. Reassess after eight to twelve weeks.
Should I bulk or cut if I'm skinny fat?
Usually recomp first: eat at about maintenance, hit 1.6 to 2.2 g of protein per kg, and train with progressive overload. Cutting leaves a light frame smaller, and bulking adds fat to the waist you are trying to shrink. Once your lifts slow and your waist is under half your height, a lean bulk is the next step.
What body fat percentage should I cut at before bulking?
Many coaches use roughly 15% for men and 25% for women as the line between bulking and cutting first. These are rules of thumb, and home estimates can be several points off, so read the trend in your waist and lifts rather than one number. A waist at or above half your height is a simpler signal that fat loss comes first.
Will I lose muscle if I cut first?
Some lean tissue loss is normal, and lean people lose a larger share than people with more fat to lose. Losing 0.5 to 1% of bodyweight a week, eating high protein and continuing to lift keeps the loss small. If your lifts hold while your weight and waist come down, you are mostly losing fat.
Can I bulk and cut at the same time?
That is body recomposition, and it works best for beginners, people returning after a break, and people with more fat to lose. For a trained, lean lifter it is slow enough that picking one direction for a few months usually gets further.