How much protein per day based on your goal

Updated: October 9, 2026

"You need to eat protein" — you've read it everywhere. But specifically, how much? 80g? 150g? 200g? The truth is, the answer depends on your weight, your goal, and your activity level — not some magic number you saw on Instagram. Let's clear things up with simple benchmarks you can start using today.

Why protein is the one macro you can't afford to skip

Before we get into numbers, a bit of context. Protein plays three key roles in your body transformation:

It builds and repairs muscle: without enough protein, you simply can't build muscle mass, no matter how hard you train.
It protects your muscle mass in a calorie deficit: when you're eating less to lose fat, your body tends to break down muscle too if you're not giving it enough protein.
It keeps you fuller than carbs or fat: for the same number of calories, a protein-rich meal curbs hunger better, which makes any diet way easier to stick with long-term.

Bottom line: whether your goal is to cut, bulk up, or just get back into regular exercise, protein is your best ally against giving up halfway through.

How much protein per day to lose fat

When you're cutting, the goal is twofold: maximize fullness and protect your muscle while you're in a calorie deficit. This is where protein becomes pretty much non-negotiable.

General benchmark: between 1.6 and 2.2g of protein per kg of body weight per day.
For someone weighing 154 lbs (70kg), that's between 112g and 154g of protein per day.
The bigger your calorie deficit, the more you should lean toward the top of that range to limit muscle loss.

Cutting calories without keeping an eye on protein means you risk losing muscle too, not just fat. So Kaizmax's engine first estimates your calorie needs (Mifflin-St Jeor formula), then sets your protein in grams per kg rather than as a percentage of calories (which would shrink along with your deficit). When you're losing fat, the benchmark is 2g/kg, calculated on a reference weight rather than the number on the scale if you're overweight, with a cap when your calorie budget is tight.

How much protein per day to build muscle

During a bulk (or simply when you're trying to get stronger and build muscle), your needs are slightly different but still fall in a similar range.

General benchmark: between 1.6 and 2g of protein per kg of body weight per day.
Beyond roughly 2.2g/kg, don't expect any meaningful extra benefit for muscle protein synthesis — no need to overdo it.
What really matters for building muscle is your overall calorie surplus combined with progressive resistance training. Protein supports muscle building, but it doesn't trigger it on its own.

Quick real-world example: for 176 lbs (80kg), aim for between 128g and 160g of protein per day, spread across 3 to 5 meals to optimize muscle protein synthesis throughout the day.

How much protein per day to get back into shape or stay fit

If your goal isn't to cut hard or pack on a lot of muscle, but just to get back into regular exercise or maintain your current shape, you don't need to be quite so precise.

General benchmark: between 1.2 and 1.6g of protein per kg of body weight per day.
This is more than enough to support recovery after your workouts and cover your needs, without overcomplicating your diet.
If you're just getting back into exercise after a long break, focus on consistency rather than hitting an exact number: 100g spread evenly through the day beats 150g crammed into one meal.

Not sure which category you fall into?

This happens a lot when you're starting out: you want to "lose a bit of fat and gain a bit of muscle" at the same time. In that case, aiming for 1.8g/kg is a reasonable starting point, which you can fine-tune later based on your results.

How to hit your protein target without turning into a walking calculator

Counting grams of protein at every single meal can get exhausting fast. Here's how to make it simple:

Build every meal around a protein source: eggs, chicken, fish, tofu, cottage cheese, legumes. If every plate has one, you'll naturally land close to your target.
Use visual cues: a portion of meat or fish about the size of your palm contains roughly 20 to 25g of protein.
Don't overlook plant-based sources: lentils, chickpeas, tofu, and edamame can cover a big chunk of your needs, even though they're lower in protein per gram than most animal sources.
Whey isn't mandatory, but it's still a convenient, budget-friendly way to close the gap at the end of the day if you're falling short of your target.

This is exactly what Kaizmax handles behind the scenes: instead of giving you one number to memorize, the app translates your macro goals into real meals. Your plan covers 7 days of meals with ingredients and quantities, and portions are adjusted to aim for your targets. You check off the meals you've eaten (and can scan the barcode of anything extra you eat): the Today screen adds it all up and shows where your protein stands against the day's target.

Key takeaways

Fat loss: 1.6 to 2.2g/kg per day, leaning toward the top if your deficit is large.
Muscle gain: 1.6 to 2g/kg, alongside a calorie surplus and progressive training — protein alone doesn't trigger muscle growth.
Getting back into shape or staying fit: 1.2 to 1.6g/kg, with consistency as your first priority.

And if you're torn between two goals, 1.8g/kg is a good starting point. Either way, building every meal around a protein source gets you close to your target without having to count every gram.

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.