How Much Protein Do You Actually Need Per Day?

For most healthy adults, the official guideline is about 0.8 grams of protein per kilogram of body weight per day. That figure is set to prevent deficiency, not to support hard training or muscle gain. If you lift regularly or want to build muscle, a higher target is usually more useful. Research generally points to a range of roughly 1.6 to 2.2 grams per kilogram per day for people who train, although individual needs vary.

Where the numbers come from

The 0.8 g per kg figure is the recommended dietary allowance for the general population. It covers the needs of most people at a basic level, but it does not reflect what people who train hard may need. A 2018 systematic review and meta-analysis by Morton and colleagues, published in the British Journal of Sports Medicine, found that gains in muscle mass with resistance training level off at around 1.6 g per kg per day in people who train. That finding is one reason many guidelines cite the 1.6 to 2.2 g range. More protein beyond that does not automatically mean more muscle.

Turning the range into a daily target

Multiply your body weight in kilograms by the number you want to aim for. For example, a body weight of 70 kg gives a rough target of about 112 to 154 grams per day across the range. Many people choose a point in the middle and adjust it over time. If your body weight is very high, or you are unsure which number suits you, a registered dietitian can help you choose a realistic figure.

Total daily intake matters more than the exact timing for most people. Still, spreading protein across meals, with a solid portion at each one, is a practical way to reach the target without relying on one large serving. Eggs, dairy, meat, fish, legumes and soy foods all provide protein. Plant sources can cover your needs when you eat a variety over the day. Protein powder is a convenient way to close a gap, but whole foods provide the same protein.

When to check with a professional

If you have kidney disease or another condition that affects how your body handles protein, check with a doctor before raising your intake. Higher protein is generally well tolerated in healthy people, but this is general information and not medical advice for your situation.

Takeaway

Treat 0.8 g per kg as the floor. If you train to build muscle, a common target is 1.6 to 2.2 g per kg per day. Choose a number in that range that you can reach consistently with food you enjoy, then adjust it based on your results over several weeks.