How much protein per day you need depends on your weight and your goal. Most people aim low, because they treat the bare survival minimum as if it were the target.
The real math multiplies your body weight in kilos by a factor from 0.8 to 2.2 grams. This guide shows the formula, how much to eat to lose fat or build muscle, and where to find that protein on the plate.
If you only want the number now, open the free protein calculator on ContaCal. The post teaches the math. The tool delivers the result.
Only need how much protein per day right now? Open the protein calculator and come back to this guide to understand each step of the math.
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How to calculate protein per kilo of body weight
How to calculate protein per kilo means multiplying your body weight in kilos by a factor from 0.8 to 2.2 grams, set by your goal.
The formula is simple. You take your body weight and multiply by the right factor. A sedentary body needs little. Someone who trains, diets, or is getting older needs much more, and that is where most home estimates aim too low.
The famous 0.8 grams per kilo is only the floor. According to Harvard Health, that number is the minimum to avoid a deficiency, not the ideal amount for an active routine.
The formula:
protein per day (g) = body weight (kg) x goal factor (0.8 to 2.2)
Example: a 70 kg (154 lb) person who wants to build muscle uses a factor of 1.6 to 2.2. The math gives 112 to 154 grams of protein per day, or roughly 0.7 to 1 gram per pound.
If you prefer to skip the mental math, use the protein calculator and come back here to check why each number exists.
How much protein per day for your goal
Someone who trains and wants to gain or keep muscle needs 1.6 to 2.2 grams per kilo, well above the 0.8 minimum.
The factor changes with what you want from your body. For people who exercise, the International Society of Sports Nutrition points to 1.4 to 2.0 grams per kilo, with the top of the range for strength training.
| Profile or goal | Protein per kilo | 70 kg person |
|---|---|---|
| Sedentary (minimum) | 0.8 g | 56 g |
| Active, general health | 1.2 to 1.6 g | 84 to 112 g |
| Fat loss with muscle | 1.6 to 2.2 g | 112 to 154 g |
| Muscle gain | 1.6 to 2.2 g | 112 to 154 g |
| Older adult (60+) | 1.0 to 1.2 g | 70 to 84 g |
You do not need to nail the exact gram. Aim for your goal range and stay close to it on most days. Consistency across the week matters more than hitting a round number on one day.
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Why 0.8 g per kilo is the floor, not the target
The 0.8 g per kilo value is the minimum to avoid a protein shortfall in a still body, not the ideal for someone who trains, diets, or ages.
That number was built to prevent a deficiency, not to build muscle. Lifting breaks down fiber that needs raw material to rebuild. Dieting risks losing lean mass along with the fat. And an older body responds less to the stimulus, so it asks for more protein for the same effect. A body fat reading makes this concrete, which is why it pairs with knowing how to calculate body fat percentage.
Protein for fat loss: the macro that protects muscle and curbs hunger
On a fat loss diet, high protein protects muscle from the cut and raises fullness, which makes the deficit easier to hold.
Protein works for you in two ways. It fills you up more than carbs and fat, so you feel less hungry on the same calories. And it preserves lean mass during the cut, so the scale drops fat instead of muscle. Pairing high protein with an approach like intermittent fasting can work, as long as the protein stays high.
Protein is not magic. Eating beyond your goal range speeds nothing up, the excess turns into energy like any calorie. And anyone with diagnosed kidney disease should talk to a doctor before pushing protein much higher.
Where to find protein: a food table
Hitting the target gets easy once you know the protein in each food, from chicken to eggs to whey.
You do not need powder or anything expensive to get there. Real food covers most of it. The table shows the protein in common portions, and creatine alongside training is a simple way to support the muscle you feed, covered in how to take creatine.
| Food | Portion | Protein |
|---|---|---|
| Grilled chicken breast | 100 g | 31 g |
| Lean beef | 100 g | 27 g |
| Canned tuna | 100 g | 26 g |
| Whey protein | 1 scoop (30 g) | 24 g |
| Egg | 1 unit | 6 g |
| Cottage cheese | 100 g | 11 g |
| Plain yogurt | 170 g | 9 g |
| Cooked lentils | 100 g | 9 g |
Notice how chicken, eggs, and tuna carry the heavy load. Building two or three meals around them already takes most people close to the target.
How to spread protein through the day
The body uses protein better when it is spread across 3 to 4 meals, with about 20 to 40 grams in each one.
Eating 150 grams of protein in one sitting does not work as well as splitting it. Each meal with protein gives a fresh signal for muscle to hold or grow. So spread it out, with around 0.4 gram per kilo at each stop. A workout like HIIT at home gives that protein a reason to land on muscle.
This is where most people lose the game. Knowing how much protein per day is the easy part. The hard part is closing the target every day without weighing everything, because we almost always underestimate what we ate. An app like ContaCal takes that weight off: you photograph the plate, the AI adds up the protein and calories, and it is clear whether the day landed on target or came up short.
When you only want the numeric result, the protein calculator closes the number from your weight and goal. The guide remains the map. The tool just runs the math.
Once your protein target is set, what is left is splitting the rest of your calories and choosing the food. The protein and macros guide shows which article to read on macros, carbs, foods, whey and creatine.