Bulking vs Cutting: The Complete Beginner’s Guide to Doing Both Right

If you’ve spent any time around lifting, you’ve heard the two words that shape almost every serious physique: bulking and cutting. One builds muscle, the other reveals it, and understanding how they work together is the single most important thing you can learn about transforming how you look.

The problem is that most people go about it blindly. They bulk too dirty, cut too hard, or bounce between the two with no real plan, and end up spinning their wheels for years. This guide fixes that. We’ll cover exactly what bulking and cutting are, which one you should start with, how to run each phase properly with real numbers, how to train and do cardio through both, and how to transition between them without losing your progress.

This article is informational and not a substitute for individual dietary or medical advice.

The Quick Answer

Bulking means eating in a calorie surplus to build muscle, accepting a little fat gain. Cutting means eating in a calorie deficit to lose fat while keeping the muscle you built. You alternate between them over time: bulk to add size, cut to reveal it, repeat. Which you should start with depends mostly on your current body fat. If you’re lean, bulk. If you’re carrying excess fat, cut first. That’s the whole strategy in a nutshell, and the rest of this guide shows you how to execute it well.

What Is Bulking?

Bulking is a muscle-building phase in which you deliberately eat more calories than your body burns, creating the energy surplus needed to build new muscle tissue. Paired with hard resistance training, that surplus fuels recovery and growth, allowing you to add size and strength over time.

The trade-off is that a surplus always adds some body fat alongside muscle. You genuinely cannot build muscle in a calorie surplus without gaining at least a little fat, so the aim of a good bulk is to maximise muscle while keeping fat gain modest. For a deeper look at the phase itself, including when it traditionally happens, see our guide on what bulking season is.

Bulking suits anyone who wants to get bigger and stronger and isn’t currently carrying much excess fat. It’s the phase where the actual muscle gets built. Cutting only reveals what a bulk creates.

What Is Cutting?

Cutting is the opposite: a fat-loss phase in which you eat fewer calories than you burn, creating a deficit that forces your body to burn stored fat for energy. The goal is to strip away belly fat while holding onto as much of your hard-earned muscle as possible, revealing the definition, separation, and vascularity underneath.

The key challenge of cutting is muscle retention. In a deficit, your body can break down muscle as well as fat if you’re not careful, which is why how you cut matters enormously. Done right, you finish lean and still muscular. Done wrong, you finish “skinny fat,” having lost much of the muscle you worked to build. Our guide on getting more vascular and defined covers the leanness that a good cut delivers.

Bulking vs Cutting: The Comparison

Why You Can’t Bulk and Cut at the Same Time

The reason you alternate rather than combine is simple physics. Building muscle requires surplus energy; losing fat requires an energy deficit. Those two are directly opposed, so for most people, trying to do both at once means doing neither effectively.

There is one genuine exception, body recomposition, which we cover further down, but for the majority of intermediate lifters, the fastest route to a lean, muscular physique is to focus on one goal at a time. Bulk with full effort, then cut with full effort, rather than half-heartedly chasing both.

Should You Bulk or Cut First?

This is the question everyone asks, and the answer comes down mainly to your current body fat level. Here’s a practical framework:

Bulk first if you’re relatively lean. For men, that’s roughly under 12 to 15 percent body fat; for women, roughly under 20 to 24 percent. If you can see some ab definition and you’re happy with your leanness but want more size, you have room to bulk and add muscle before you’ll need to cut.

Cut first if you’re carrying excess fat. For men, roughly above 18 to 20 percent body fat; for women, roughly above 28 to 30 percent. If you’re softer than you’d like, cutting first gets you to a leaner, healthier starting point, improves how you look quickly, and means you can then bulk from a lean base without getting excessively fat.

The “skinny fat” case. If you have little muscle and higher body fat at the same time, you’re a strong candidate for body recomposition or a lean bulk with careful attention to diet, since you have muscle to build and fat to lose simultaneously, especially as a beginner.

A good rule of thumb: it’s usually best to bulk from a lean starting point. Bulking when you’re already carrying fat just adds more fat on top and shortens how long you can bulk before you have to cut again.

How to Bulk Properly

Running a good bulk comes down to a handful of principles:

• Set a modest surplus. Add roughly 250 to 500 calories above your maintenance level. Bigger surpluses don’t build muscle faster; they just add fat, because your body can only build muscle at a limited rate.
• Gain slowly. Aim for around 0.25 to 0.5 percent of your bodyweight per week, roughly half a pound to a pound for most people. Beginners can gain a little faster. If the scale is shooting up, you’re adding fat, so trim the surplus.
• Prioritise protein. Aim for around 1.6 to 2.2 grams per kilogram of bodyweight daily. A protein shake or two helps you hit it.
• Fill the rest with quality carbs and fats. Carbohydrates fuel hard training and recovery, while healthy fats support hormones. Build meals around whole foods, a topic we cover in our clean bulk vs dirty bulk guide.
• Train for progressive overload. The surplus only becomes muscle if you consistently challenge your body to lift more over time. Our guide on how many exercises per muscle group covers sensible training volume, built around big lifts like the squat and deadlift.
• Keep some cardio. A little cardio during a bulk keeps your heart healthy and your conditioning up without eating into your surplus.

How to Cut Properly

Cutting is where most people lose muscle through impatience. Do it right with these rules:

• Set a moderate deficit. Drop roughly 300 to 500 calories below maintenance, around a 20 to 25 percent deficit for most people. Aggressive crash deficits burn muscle and tank your energy and training.
• Lose fat steadily. Target around 0.5 to 1 percent of your bodyweight per week, roughly one to two pounds. Slower preserves more muscle; much faster risks losing it.
• Push protein higher. In a deficit, protein needs rise to protect muscle. Aim for the higher end, around 2.0 to 2.6 grams per kilogram of bodyweight. This also keeps you fuller, which makes dieting far easier.
• Keep lifting heavy. This is the single most important thing for retaining muscle while cutting. Heavy resistance training tells your body to hold onto its muscle. Don’t switch to light weights and high reps thinking it “tones”, keep training hard, even if you slightly reduce total volume as recovery dips.
• Use cardio as a tool, not a crutch. Cardio helps widen your deficit and burn fat. Steady-state or HIIT both work, and some people like fasted cardio, though total calories matter far more than timing. Just don’t rely on endless cardio alone; a big deficit plus excessive cardio is a fast way to lose muscle.
• Consider diet breaks. On longer cuts, periodic breaks at maintenance calories can support adherence, hormones, and sanity.

Body Recomposition: The Third Option

Body recomposition means building muscle and losing fat at the same time, effectively bulking and cutting simultaneously. It sounds like the holy grail, and for some people it genuinely works well. It’s most effective for:

• Beginners, whose bodies respond dramatically to training and can build muscle even in a slight deficit.
• Returning lifters, who regain lost muscle quickly thanks to “muscle memory.”
• People with higher body fat, who have plenty of stored energy to fuel muscle growth while losing fat.

For lean, experienced lifters, recomposition is slow and difficult, which is why those individuals are better served by dedicated bulk and cut phases. If you’re a beginner or carrying some extra fat, though, eating around maintenance with high protein and hard training can let you do both at once for a while.

Training and Cardio Through Both Phases

A common mistake is completely overhauling your training between phases. You shouldn’t. In both bulking and cutting, your resistance training should stay centred on progressive overload with challenging weights. During a bulk you’ll have more energy to push volume and add weight; during a cut you focus on maintaining your strength to signal muscle retention, perhaps trimming volume slightly as recovery capacity drops.

Cardio is the main lever that changes. During a bulk, keep it modest, enough for health and conditioning. During a cut, you can add cardio to help create your deficit. The principle throughout is that lifting builds and protects muscle, while diet and cardio manage your body fat.

Transitioning Between Phases

How you move between phases matters more than people realise:

• Ending a cut (reverse dieting). Don’t leap from a deep deficit straight into a big surplus, which invites rapid fat regain. Instead, gradually raise your calories back toward and then above maintenance over a few weeks.
• Ending a bulk. You can either transition into a cut when your body fat climbs to a level you’re no longer happy with, or use a “mini-cut,” a short, sharper deficit of a few weeks, to shed accumulated fat before continuing to bulk.
• Maingaining. Some intermediate lifters hover near maintenance for long stretches, slowly gaining muscle while staying lean year-round. It’s slower but keeps you looking good throughout.

Common Bulking and Cutting Mistakes

• Bulking too dirty or too long, piling on fat that makes for a miserable cut later.
• Cutting too aggressively, crashing calories and losing muscle along with fat.
• Dropping protein during a cut, the fastest way to lose muscle in a deficit.
• Switching to “toning” workouts when cutting, abandoning the heavy lifting that retains muscle.
• Doing endless cardio, which combined with a big deficit eats into muscle.
• Never committing to either phase, perpetually eating “around maintenance” by accident and never progressing.
• Not tracking, guessing at calories and wondering why nothing changes.

Sample Numbers

To make it concrete, imagine an 80 kg (176 lb) lifter with a maintenance level of around 2,600 calories:

• Bulk: roughly 2,900 to 3,100 calories, with about 130 to 175 g protein, aiming to gain around half a pound per week.
• Cut: roughly 2,100 to 2,300 calories, with about 160 to 200 g protein, aiming to lose around one pound per week.

These are illustrative starting points, not prescriptions. Adjust based on how your weight actually responds over two to three weeks, since maintenance calories vary from person to person.

The Bottom Line

Bulking and cutting aren’t rivals, they’re two halves of the same strategy. You bulk to build muscle, accepting a little fat gain, then cut to strip that fat away and reveal the physique underneath. Get the sequence right by starting from a lean base, run each phase with a sensible surplus or deficit, keep your protein high and your lifting heavy throughout, and transition between them gradually rather than lurching from one extreme to the other.

Master that cycle and you have the entire blueprint for building a lean, muscular body over time. It isn’t about finding a magic diet, it’s about patiently alternating between building and revealing, again and again, until you get where you want to be.