Bulking: the beginner's guide
Updated: October 9, 2026
Want to build muscle but don't know where to start? Heard that you should just "eat everything, a lot, all the time" to bulk up? Bad news: that approach will mostly get you fat. Good news: a proper bulk, one that actually builds muscle without piling on needless fat, follows simple, measurable rules. Here's everything you need to know, straight to the point.
What bulking really means
Bulking means eating in a calorie surplus to give your body the energy it needs to build muscle, combined with resistance training that gives that muscle a reason to grow. Without a surplus, there's not enough energy to build anything. Without proper training, that surplus just turns into fat. The two go hand in hand — neither works on its own.
Contrary to popular belief, you don't need a +1000 to +1500 kcal surplus to make progress. Going too aggressive doesn't grow more muscle, it just stores more fat. Your body can only build muscle tissue at a limited rate, no matter how many extra calories you throw at it.
How to calculate your calorie surplus correctly
First things first: figure out your total daily energy expenditure (TDEE), based on your basal metabolic rate (Mifflin-St Jeor formula) and your activity level. Once you have that number, add a moderate surplus on top:
- Beginner: +10 to 15% above your TDEE (usually 200 to 350 kcal, depending on your body size)
- Intermediate: +5 to 10% (your body responds slower at this stage, so there's no point adding more)
- Women: needs tend to sit closer to the lower end of the range, with a tighter margin for error
In practice, if your TDEE is 2400 kcal, you're aiming for 2600 to 2750 kcal a day — not 3500. The goal: gain between 0.5 and 1 lb per week. Beyond that, you're mostly gaining fat. Below 0.2 lb per week, your surplus is probably too small to matter.
This is exactly the kind of calculation Kaizmax does automatically: based on your sex, age, weight, height, daily activity, and workouts, the app estimates your expenditure and adds 10% on top for a bulking goal. Then, if you weigh yourself regularly, the adaptive coach (Premium, first adjustment free) can fine-tune that target based on your scale trend — more on that below.
Macros: what separates muscle from fat
Protein, non-negotiable
Aim for 1.6 to 2.2 g of protein per kg of body weight. For someone weighing 165 lbs (75 kg), that's 120 to 165 g a day, spread across 3 to 4 meals. Protein is your muscle-building material: without enough of it, your surplus just makes you bigger, not stronger.
Carbs, your training fuel
Carbs aren't the enemy — they're actually your number one ally when bulking. They fill up your glycogen stores and let you lift heavy. Aim for around 3 to 5 g per kg of body weight, depending on how active you are.
Fat, the adjustable variable
Once protein and carbs are set, fat fills in the rest of your calories, usually around 0.8 to 1 g per kg. Fat is essential for hormone production (testosterone included), so don't go cutting it drastically.
Training: the real trigger for growth
Eating in a surplus without training seriously just... makes you gain weight. For that surplus to actually build muscle, you need:
- Resistance training 3 to 5 times a week, with weights that progressively increase (either in load or reps)
- Enough volume per muscle group: roughly 10 to 20 weekly sets per muscle for beginners to intermediates
- Solid technique over poorly controlled heavy lifting
- Proper recovery time: muscle grows during rest, not just under the bar
That's why your workouts need to match the equipment you have (full gym, home setup, resistance bands...) and your current level: otherwise you spend your sessions improvising substitutions, and your progress gets hard to track. Kaizmax builds your workouts around your equipment, your level, and the number of days you can train; with Premium, the gym tools also suggest your next load based on the sets you logged (double progression).
Clean bulk vs. "dirty" bulk
The "dirty bulk" (eating whatever, in huge amounts) had its moment on social media, but it mostly just piles on fat you'll painfully have to lose later. A clean bulk, on the other hand, relies on:
- A moderate, calculated calorie surplus — not a guess
- Mostly minimally processed foods: meat, fish, eggs, legumes, whole grains, fruits, and vegetables
- Room for treats (15-20% of your calories) without letting them become the foundation of your diet
- Regular tracking of weight and measurements so you can adjust if you're gaining too fast or too slow
The goal isn't to be nutritionally perfect 24/7, but to have a clear structure you stick to 80% of the time.
Tracking progress and adjusting at the right time
A bulk that runs on autopilot without adjustments is the best way to end up gaining far more fat than muscle. Here's what to watch every week:
- The number on the scale: weekly average, not a single reading
- Your gym performance: if you haven't progressed in load for 3-4 weeks, your surplus or your sleep might be falling short
- Your waist size: a simple, reliable indicator to catch fat gain that's happening too fast
- Your overall energy levels: chronic fatigue is often a warning sign, not just something to push through
This is where regular adjustments really make a difference: instead of sticking to a number calculated once and never revisited, nudge your calorie target in small steps. If your weekly average climbs by more than 1 lb from one week to the next, trim your calories a little, from carbs and fat; if it hasn't moved in two to three weeks, bring them back up a little. Either way, keep your protein steady.
In Kaizmax, that's the job of the adaptive coach (Premium, first adjustment free): at most once a week, and never before your program is 7 days old, it compares the trend of your weigh-ins over 14 days (it needs at least two, five or more days apart) with the expected range for a bulk, +0.05 to +0.50 kg (roughly +0.1 to +1.1 lb) per week. That range is wider than the ideal one above: it only steps in on a clear deviation. If you're outside it, it adjusts your target by 100 to 125 kcal through carbs and fat, protein unchanged, and rebuilds your week's meals around the new target; your workouts stay the same. One exception: if your BMI is below 18.5, it leaves your diet as is. It only reads your weight: your performance, waist size, and energy are still yours to watch.
This article is informational and not a substitute for medical advice. In case of a health condition, pregnancy or doubt, consult a healthcare professional.
Want to go further? Browse all the Kaizmax guides. And for your tailored diet + training plan: download Kaizmax for free — a short questionnaire, ready in 2 minutes.