How much protein per day? Read the UK reference

Quick answer: For generally healthy adults, the current UK Reference Nutrient Intake (RNI) for protein is 0.75 g per kilogram of body weight per day. It is a reference for population needs, not a personalised gym goal, a maximum or a dose for kidney disease. At a purely illustrative 70 kg, 0.75 × 70 = 52.5 g a day. Sport, pregnancy, illness, ageing and treatment can change what advice fits; a registered dietitian can assess a person's situation.

This UK guide explains the reference, food-label arithmetic and when a general figure stops being useful. It does not calculate a personal target or set a compulsory amount for each meal.

AI-generated content. Always verify ingredients and allergen information yourself. A protein total cannot establish whether a food is safe for someone with an allergy.

What does the UK adult number actually mean?#

The British Nutrition Foundation states the UK adult RNI as 0.75 g/kg of body weight per day. A Scientific Advisory Committee on Nutrition (SACN) statement also lists that UK RNI for adults. SACN's later reference-value explanation makes clear that protein reference values are expressed by body weight. None of these documents calculates your requirement from a web form.

Here is how the reference arithmetic works, not a personal target table:

These numbers do not account for illness, body composition, pregnancy, training, poor appetite or medical treatment. In particular, do not apply a body-weight formula without individual advice if you have kidney disease or are receiving nutrition support.

The 50 g figure you may see as an adult protein reference intake on packaging serves a different labelling purpose. The BNF explains that it is based on an average adult reference diet. It is not the same thing as the weight-based RNI and does not mean everyone needs exactly 50 g.

Which everyday UK foods contribute protein?#

The NHS Eatwell Guide includes beans and lentils, fish, eggs, meat and other protein foods, alongside dairy or alternatives. Bread and other starchy foods can also contribute. A balanced choice is not simply the product with the largest protein number; the whole food and your dietary needs matter.

This table lists categories, not invented per-serving protein claims. A Tesco, Aldi, M&S or other supermarket pack can differ from another brand or size. Read the one in your hand, including its allergens.

How do you calculate protein from a UK label?#

NHS food-label guidance says the nutrition panel shows protein per 100 g or 100 ml and may show it per portion. The manufacturer's portion might differ from yours, and grams of food are not grams of protein.

For invented arithmetic only, suppose a food label shows 12 g protein per 100 g and you eat 150 g of that same food on the same basis. Then 12 × 150 ÷ 100 = 18 g protein. These are not facts about a named food or a recommended serving. If one figure is for dry food and the other for cooked food, or if the label's “as prepared” basis includes additions, resolve that mismatch before calculating.

For a home-cooked dish, check each actual ingredient and the amount eaten. Dividing a batch equally assumes equal servings. The BNF's food examples are useful background, but a current pack is more specific for that product.

Do exercise or age change the answer?#

The BNF sport guide says extra protein is unlikely to be needed just because someone is active within the usual adult activity guidance. People training regularly for strength or endurance may have higher needs; the same page distinguishes those athletes from the general population. A high-protein product by itself does not build muscle. A coach's or app's universal “grams per meal” number is not established by the UK adult RNI.

For older adults, avoid importing a single higher number from another country's guidelines. The SACN older-adults statement lists the UK adult RNI but describes evidence on higher dietary protein and musculoskeletal outcomes as unclear; trials of protein supplements did not show a consistent benefit. That does not mean an older person with poor appetite or illness should simply keep eating less. A GP or dietitian can assess malnutrition risk and individual needs.

Pregnancy and recovery from illness are also not solved by this table. The appropriate amount and food choices need advice that fits the person. The UK reference is a starting point for understanding the question, not a replacement for a midwife, GP or registered dietitian.

What if you have kidney disease?#

Do not apply general or sports protein figures to chronic kidney disease. University Hospitals Sussex NHS Foundation Trust explains that protein needs differ with kidney treatment; dialysis can change the direction of advice, and a renal dietitian may adjust the body-weight basis. It also notes that packaged-food protein values vary by brand.

Do not restrict protein or add supplements because of this article. Follow your own renal team or clinician's plan. A general “more is better” slogan can be as misleading as assuming everyone needs less.

Common questions#

Is 0.75 g/kg a daily maximum?#

No. It is the UK adult RNI, not a ceiling. Whether more or less is suitable depends on circumstances and, for medical conditions, individual care.

Does everybody need 20–30 g at every meal?#

The UK adult RNI is a daily, weight-based reference. It does not set a compulsory amount for breakfast, lunch or dinner. A practical meal pattern can include a variety of protein foods without making every plate pass a gram test.

Do I need protein powder?#

Most people can meet the general reference through food; the BNF reports that UK average intakes exceed the adult RNI. That population average cannot diagnose your intake. If you think yours is low, your appetite has changed or a clinician has given you a target, ask for individual advice before using a supplement.

Medical note: This is general nutrition information, not an individual prescription.