Protein is the one macronutrient almost everyone under-eats, and getting it right changes how you look, feel and recover. The honest answer to "how much protein per day" depends on your body weight and your goal, not a single magic number. This guide gives you simple gram-per-kilogram targets, food examples to hit them, and the science behind each range.
Why protein matters
Protein does more than build muscle, although that is its headline job. It is the raw material your body uses to repair tissue, build enzymes and hormones, and maintain a healthy immune system.
Three benefits stand out for most people:
- Muscle growth and maintenance. Protein supplies the amino acids your body uses to repair and build muscle after training. Without enough, even hard workouts leave gains on the table.
- Satiety and appetite control. Gram for gram, protein is the most filling macronutrient. Higher-protein meals help you feel full longer, which makes eating fewer calories far easier.
- Recovery. Adequate protein supports faster recovery between training sessions and helps preserve lean tissue as you age.
The RDA versus what active people actually need
The Recommended Dietary Allowance (RDA) for protein, set by the Institute of Medicine, is 0.8 grams per kilogram of body weight per day. That sounds official, but it is important to understand what it means: the RDA is the minimum to prevent deficiency in a mostly sedentary adult, not the optimal amount for someone who trains, is dieting, or wants to build muscle.
The Institute of Medicine also publishes the Acceptable Macronutrient Distribution Range (AMDR), which allows protein to make up 10 to 35 percent of total daily calories. That upper end leaves plenty of room for the higher intakes active people benefit from.
For people who exercise, the International Society of Sports Nutrition (ISSN) position stand on protein and exercise recommends a daily intake of 1.4 to 2.0 grams per kilogram of body weight to build and maintain muscle. Many practitioners aim toward the upper part of that band, around 1.6 to 2.2 grams per kilogram, when the goal is muscle gain or fat loss.
How to set your own protein target
Start with your body weight in kilograms, then pick a multiplier based on your goal:
- General health, lightly active: 1.2 to 1.6 grams per kilogram
- Building muscle or training hard: 1.6 to 2.0 grams per kilogram
- Fat loss while preserving muscle: 1.8 to 2.2 grams per kilogram
A simple worked example: a 70 kg person aiming to build muscle at 1.8 grams per kilogram would target about 126 grams of protein per day.
If you carry significant body fat, base the calculation on a goal or lean body weight rather than total weight, so your target does not balloon unrealistically. To see how protein fits alongside your carbs and fats, run the numbers through our macro calculator, and check your overall energy needs with the TDEE calculator.
Protein during a calorie deficit
When you eat fewer calories than you burn, your body can break down muscle alongside fat. Protein is your main defence against that.
Research summarized in the ISSN position stand suggests that protein needs rise during dieting, with intakes toward the higher end (and in some lean, trained individuals even above 2.2 grams per kilogram) helping retain lean mass while losing fat. Practically, that means:
- Keep protein high even as total calories fall.
- Combine higher protein with resistance training to signal your body to keep its muscle.
- Do not slash calories so aggressively that hitting your protein target becomes impossible.
If you are setting up a cut, our calorie deficit calculator helps you choose a sensible deficit, and the TDEE calculator gives you the maintenance baseline to subtract from.
How much protein per meal
Total daily protein is what matters most, but spreading it across the day helps. Muscle protein synthesis responds to a meaningful dose of protein at each meal rather than one giant serving.
A reasonable approach for most people:
- Aim for roughly 25 to 40 grams of protein per meal, across three or four meals.
- Include a protein source at breakfast, which is the meal where most people fall short.
- If you train, having protein in the hours around your workout is a practical habit, though total daily intake still drives results.
Good protein sources and rough grams
You do not need powders to hit your target, though they are convenient. Here are approximate amounts in common foods:
- Chicken breast, 100 grams cooked: about 31 grams
- Lean beef, 100 grams cooked: about 26 grams
- Salmon, 100 grams cooked: about 25 grams
- Eggs, 1 large: about 6 grams
- Greek yogurt, 170 gram pot: about 17 grams
- Cottage cheese, 100 grams: about 11 grams
- Lentils, 100 grams cooked: about 9 grams
- Tofu, 100 grams: about 8 grams
- Whey protein, 1 scoop: about 24 grams
Mixing animal and plant sources is fine. Plant eaters can absolutely hit high targets by leaning on legumes, soy foods, seitan and protein powders, and by eating a bit more total protein to cover differences in amino acid profiles.
Can you eat too much protein?
For healthy people, the fear of "too much protein" is largely overblown. The ISSN position stand concludes that intakes in the 1.4 to 2.0 grams per kilogram range are safe and may improve training adaptations, with no harm to kidney function or bone health in healthy, active individuals.
A few sensible caveats:
- People with existing kidney disease should follow medical advice on protein, which may differ.
- Extremely high intakes offer no extra muscle benefit and simply crowd out other nutrients.
- Stay hydrated and keep your overall diet balanced with vegetables, fibre and healthy fats.
For nearly everyone, the realistic risk is eating too little protein, not too much.
Frequently asked questions
Is more protein always better for building muscle?
No. Once you reach roughly 1.6 to 2.2 grams per kilogram combined with proper training, eating more protein does not produce extra muscle. The leftover calories are just used for energy or stored.
Do I need protein right after my workout?
The so-called anabolic window is wider than once believed. Hitting your total daily protein target matters far more than precise timing, though having protein within a few hours of training is a fine habit.
How much protein do I need to lose weight?
During a calorie deficit, higher protein, around 1.8 to 2.2 grams per kilogram, helps preserve muscle and keeps you full. Pair it with resistance training and a moderate deficit you can sustain.
Can I get enough protein on a plant-based diet?
Yes. Legumes, soy foods such as tofu and tempeh, seitan, and plant protein powders make high intakes achievable. Eating slightly more total protein helps cover differences in amino acid quality.
This article is for general educational purposes and is not medical advice; consult a qualified healthcare professional before making significant changes to your diet, especially if you have a health condition.