A standard reference allowance for healthy adults is 0.8 grams of protein per kilogram of body weight per day. At 70 kg, that calculation is 56 g daily. It is a population reference, not a personalized prescription or a universal target for sport, pregnancy, illness or recovery. The NIH Office of Dietary Supplements summarizes this allowance and the higher ranges studied for athletes.
How to do the calculation
Daily protein in grams = body weight in kilograms × the appropriate grams-per-kilogram factor. Convert pounds to kilograms by dividing by approximately 2.205. Confirm that you are using kilograms before multiplying: applying a kilograms-based factor directly to pounds overstates the result.
| Body weight | Arithmetic at 0.8 g/kg/day |
|---|---|
| 50 kg | 40 g/day |
| 60 kg | 48 g/day |
| 70 kg | 56 g/day |
| 80 kg | 64 g/day |
| 90 kg | 72 g/day |
These rows illustrate one reference factor. They are not a diagnosis of deficiency and do not identify the best intake for a particular person. For example, 154 lb is about 69.84 kg; multiplying by 0.8 gives about 55.9 g/day. There is no practical need to plan a diet to a fraction of a gram.
Why your appropriate amount may differ
NIH summarizes athlete guidance around 1.2–2.0 g/kg/day, depending on training and context. That does not mean everyone who exercises needs the upper end. Age, overall food intake, training load, pregnancy or breastfeeding and health conditions can change the assessment. The USDA’s DRI calculator provides a separate reference-intake workflow using personal characteristics; individual requirements can differ from reference estimates.
If you use the CalcRange protein calculator, read the selected activity assumptions and compare the result with appropriate professional guidance. The output is an estimate, not evidence that you need a supplement. For the distinct considerations in later life, see protein needs after 60.
When to get individual advice
Do not choose a high-protein plan from a general table if you have kidney disease or have been given a clinical protein limit. The National Kidney Foundation explains that needs can differ before and during dialysis and recommends advice from the healthcare team or a kidney dietitian. Pregnancy, recovery from illness, unexplained weight loss or difficulty eating also warrant individualized advice rather than automatically reusing a healthy-adult factor.
Check what you already eat
Use food labels and the actual serving size to estimate your current intake before making changes. A 150 g portion of food is not necessarily 150 g of protein. Add the grams of protein in each serving across the day. Include foods you actually eat and can sustain, rather than building a plan around the calculator’s most precise-looking number.
A simple tracking example: if three meals contain 18 g, 22 g and 20 g of protein, the meal total is 60 g. Add any snacks separately. This is addition practice, not a recommended meal plan.
Frequently asked questions
Is the reference allowance a maximum?
No. It is not an upper limit. But a higher calculated number is not automatically better or appropriate for you; match the factor to your circumstances.
Are grams of food and grams of protein the same?
No. Use the protein entry on the food label or a reliable food-composition record, adjusted for the portion eaten.
Can this tell me whether I am deficient?
No. A body-weight calculation cannot diagnose a nutritional problem. If you are concerned about your intake, health or weight changes, discuss the pattern with a registered dietitian or healthcare professional.
General nutrition education, not medical advice. Source references checked September 10, 2026; this page does not claim independent clinical review. See our editorial and correction policy.