How much protein do you need to build muscle?

How much protein do you actually need?

For adults doing regular resistance training with the goal of building muscle, research consistently points to a range of 1.6-2.2 g of protein per kilogram of body weight per day. For example, someone weighing 70 kg would target roughly 112-154 g of protein daily.

This is meaningfully higher than the general population guideline (around 0.8 g/kg), which is designed to prevent deficiency rather than support active muscle growth. Going above 2.2 g/kg is unlikely to provide extra benefit for most people and simply displaces calories that could come from carbohydrates or fats, which also matter for training performance and recovery.

• Beginners often see good results at the lower end of the range, since new-to-training muscles adapt quickly.
• Intermediate to advanced lifters may benefit from the upper end, particularly when in a calorie deficit, as extra protein helps protect muscle mass while losing fat.
• Older adults may need the higher end of the range too, as muscle-building efficiency per gram of protein tends to decline with age.

Using a protein calculator that factors in your body weight, activity level, and goal can take the guesswork out of finding your personal target.

Does protein timing really matter?

You may have heard about an "anabolic window" requiring protein within 30 minutes of finishing a workout. Current evidence suggests this window is much wider and more forgiving than once thought.

What matters most is your total daily protein intake and consistent training over time. Having a protein-containing meal or snack sometime within a few hours before or after training is perfectly adequate for most people. If you train fasted in the morning and eat breakfast afterwards, or have your last meal a couple of hours before an evening session, you're very likely covering your bases.

In short: don't stress about precise timing, but do make sure protein features in most of your meals throughout the day.

Why distribution across meals matters

Muscle protein synthesis - the process by which your body repairs and builds muscle tissue - responds best to protein doses of roughly 20-40 g at a time, spaced across the day. Eating all your protein in one large meal is less effective than spreading it across three to five meals or snacks.

• Aim for a source of protein at breakfast, lunch, dinner, and one or two snacks if needed.
• If you struggle to eat much in the morning, even a smaller 15-20 g portion at breakfast, topped up later, is better than skipping protein entirely until the evening.
• Tracking your meals with an app can help you spot patterns, such as a protein-heavy dinner but very little earlier in the day, so you can rebalance more evenly.

Leucine and complete proteins

Not all protein sources are equal when it comes to stimulating muscle growth. The amino acid leucine acts as a key trigger for muscle protein synthesis, and foods rich in leucine tend to be more effective per gram of protein consumed.

Complete proteins - those containing all nine essential amino acids in useful amounts - are generally the most efficient choices. These include:

• Meat, poultry, and fish
• Eggs
• Dairy products such as milk, yoghurt, and cheese
• Soy products like tofu, tempeh, and edamame

Plant proteins such as beans, lentils, nuts, and grains can absolutely support muscle building too, but many are lower in one or more essential amino acids or leucine specifically. Combining a variety of plant proteins across the day, or including some dairy or soy, helps ensure you're getting a good amino acid spread if you follow a vegetarian or vegan diet.

Practical ways to hit your protein target

Reaching 1.6-2.2 g/kg consistently is easier with a bit of planning:

• Build meals around a palm-sized portion of protein first, then add carbohydrates and vegetables.
• Keep quick, high-protein options on hand: Greek yoghurt, cottage cheese, eggs, tinned fish, and pre-cooked chicken or tofu.
• Use a high-protein foods list to identify options that fit your dietary preferences and budget.
• Log your meals in a tracking app to see your daily total at a glance and adjust before the day ends, rather than realising you're short at bedtime.
• Protein supplements like whey or plant-based powders can be a convenient top-up, but they're not required - whole foods can fully meet your needs.