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How Much Protein Do You Really Need to Build Muscle?

Quick answer: To build muscle, most active adults should eat 1.6 to 2.2 grams of protein per kilogram of body weight per day. For an 80kg lifter, that’s roughly 130-175g of protein daily, spread across 3-5 meals of 20-40g each. Going much higher than 2.2g/kg gives diminishing returns for muscle growth.

That single number is the most important thing to get right if you train and want results. Below we break down where it comes from, how to hit it, and how to fill the gap when whole food falls short.

What the science actually says

The 1.6-2.2g/kg range comes from a landmark 2018 meta-analysis (Morton et al.) and is echoed by the International Society of Sports Nutrition, which states that 1.4-2.0g/kg/day is sufficient for most exercising people to build and maintain muscle.

A more recent dose-response review found a clear pattern of diminishing returns: below about 1.3g/kg, extra protein delivers meaningful lean-mass gains, but above that threshold each additional gram does progressively less. In short, more is not automatically better.

When does going higher make sense? During a calorie deficit (a cut), research suggests 2.3-3.1g/kg can help protect muscle while you lose fat. For most people in a normal or building phase, aiming for 1.6-2.2g/kg is the sweet spot.

How to work out your personal target

Take your body weight in kilograms. (Pounds divided by 2.2 = kg.)
Multiply by 1.6 for a solid baseline, or 2.2 to maximise growth.
Divide across your meals. Aim for 20-40g of protein per sitting, including one serving within a few hours of training.

Body weight	Baseline (1.6g/kg)	Maximum (2.2g/kg)
60kg	96g	132g
75kg	120g	165g
90kg	144g	198g

Do you need to time protein perfectly?

The old “anabolic window” of 30 minutes after training has been overstated. Total daily protein matters far more than precise timing. That said, evenly spacing 20-40g doses across the day keeps muscle protein synthesis elevated and is the easiest way to hit a high daily total without forcing it all into one meal.

Whole food vs protein powder

You can absolutely hit your target from chicken, eggs, fish, dairy and legumes. The problem is practicality: eating 170g of protein a day from food alone is filling, time-consuming and expensive.

That’s where supplements earn their place. A single scoop of whey or a beef protein isolate delivers 20-25g of protein in seconds, with minimal fat or carbs. It’s a tool to close the gap, not a replacement for real food.

If you’re choosing between protein types, our breakdown of NXT beef protein vs whey covers which suits dairy-sensitive lifters best.

What about protein quality?

Quantity gets most of the attention, but leucine – an amino acid that triggers muscle protein synthesis – is the quality marker that matters. Animal proteins (whey, beef, eggs) are naturally rich in leucine; most plant proteins are lower, so vegan lifters should aim toward the higher end of the range and combine sources.

This is also why dedicated amino acid and EAA products have made a comeback – though for most people, hitting total protein removes the need for them.

Common mistakes to avoid

Undereating protein on rest days. Muscle repair happens between sessions, so keep intake high every day, not just training days.
Chasing extreme intakes. Above 2.2g/kg (outside of a cut), you’re spending money on protein your body won’t use for muscle.
Ignoring total calories. You can’t build muscle in a meaningful calorie deficit no matter how high your protein is. Pair protein with adequate carbohydrates to fuel training.

Shop protein

Ready to hit your target? Browse our full range of protein powders – whey, isolates, beef protein and blends – or explore dedicated muscle builders to round out your stack.

Frequently asked questions

How much protein do I need to build muscle?

1.6-2.2g per kg of body weight per day for most active adults. An 80kg person needs roughly 130-175g daily.

Can I eat too much protein?

For muscle building, intakes above ~2.2g/kg offer diminishing returns. Very high intakes are generally safe for healthy kidneys but simply aren’t more effective for growth.

How much protein per meal is best?

Aim for 20-40g per meal to maximise muscle protein synthesis across the day.

Is protein powder necessary?

No – but it’s the easiest, most cost-effective way to hit a high daily target when whole food isn’t practical.

Final thoughts

Building muscle isn’t complicated: train hard, eat enough total calories, and land 1.6-2.2g of protein per kg of body weight every day. Get that consistent and the results follow. Supplements make the target realistic – not magic, just convenient.

This article is for general information and isn’t medical advice. Speak to a healthcare professional before making significant dietary changes.

How Much Protein Do You Really Need to Build Muscle? (2026 UK Guide)