How to actually calculate your calories (without the guesswork)
If you've ever typed "how many calories should I eat to bulk" into Google at 11pm and closed twelve tabs more confused than when you started, you're not alone. Calorie calculating gets treated like some kind of dark art, when really it's just a bit of maths and a willingness to adjust as you go.
Here's the no-nonsense version.
Start with your maintenance number
Before you can bulk or cut, you need to know what maintenance actually looks like for you. This is the number of calories your body burns in a day just existing, moving, training, digesting, all of it.
Two things go into working this out:
Your BMR (basal metabolic rate). This is what your body burns at total rest, just keeping your heart beating and your organs ticking over. It's based on your age, weight, height, and sex.
Your activity level. BMR on its own doesn't account for the gym, the dog walks, the job that has you on your feet all day. Multiply your BMR by an activity factor and you get your TDEE (total daily energy expenditure), which is your real maintenance number.
That's the figure everything else is built on.
Then adjust for your goal
Once you know maintenance, bulking or cutting is just a percentage shift from there.
- Cutting means eating below maintenance, usually a 10 to 20 percent deficit depending on how aggressive you want to be.
- Bulking means eating above maintenance, typically a 10 to 20 percent surplus.
- Maintaining means, unsurprisingly, staying right where you are.
The bigger the deficit or surplus, the faster the change and the more likely you are to feel it, whether that's low energy on a cut or extra fat gain on a bulk. Mild and steady tends to be more sustainable than aggressive and short-lived, but that's a personal call based on your goals and timeline.
Don't stop at the number
This is the bit most calculators skip. Your calorie target isn't a tattoo. It's a starting point.
A few things worth knowing before you commit to a number for the next six months:
Track for a couple of weeks first. You can't hit a target you're not actually measuring against. A rough log of what you're eating tells you whether you're really at your number or just guessing.
Recalculate every 2 to 3 weeks. As your weight shifts, so does your maintenance. What worked in week one won't necessarily work in week six.
Averages matter more than perfect days. One big meal out or one lazy Sunday won't undo your progress. What matters is where you land across the week, not whether every single day hits the number exactly.
Protein is the macro to actually pay attention to. Calories drive weight change, but protein drives what that change is made of, muscle or fat. If your protein target is high and your diet isn't quite covering it, that's worth solving before anything else.
Try it yourself
We built a free calculator that does the maths above for you. Pick your goal (bulk, cut, or maintain), how aggressive you want to be, and your stats, and it'll give you a daily calorie target along with a full protein, carb, and fat breakdown.
No email required, no signup, just your number. Use it as your starting point, track for a couple of weeks, and adjust from there.