Useful calculators
Estimate how much protein you may benefit from eating each day based on your bodyweight, training activity and goals.
Protein plays an important role in muscle repair, growth and maintenance, but individual requirements vary. This calculator provides an evidence-informed starting range rather than an exact personal requirement.
2. Understand your results
Protein provides amino acids used to maintain and repair body tissues, including skeletal muscle. Adequate protein supports muscle adaptation to resistance training, but training, overall energy intake and recovery also influence results.
Building and maintaining muscle do not require completely separate protein formulas. Regular resistance training and sufficient daily protein are important for both. Someone maintaining muscle while dieting may benefit from as much or more protein than someone gaining muscle in a calorie surplus.
Energy restriction increases the risk of losing some lean tissue alongside fat. Adequate protein and resistance training can help reduce this risk, but do not completely prevent muscle loss.
Consistent resistance training makes higher protein targets more relevant. Occasional exercise is different from structured resistance training, so resistance-training-specific targets are not automatically applied to every active person.
Beginners and experienced lifters can respond differently to resistance training, but current evidence does not establish reliable daily protein targets based solely on years of training experience.
For most people, training consistency, overall nutrition and energy intake are more useful considerations than training experience alone.
Calculating protein from total bodyweight can sometimes produce impractically high recommendations for people carrying substantial excess body fat. The optional goal-bodyweight approach is a practical alternative, but it is not a universally validated formula and will not suit everyone.
3. How to apply this
Your estimated protein range is a starting point.
Choose a practical target within that range and consider how you can distribute it across your normal meals. You do not need to consume an identical amount of protein every day, but consistently reaching an appropriate overall intake can help support your goals.
Include protein-rich foods across meals, use food labels or tracking tools where helpful, and adjust meal choices to fit your preferences, appetite and budget. Protein shakes are not required; they are simply one food option if they happen to be useful for you.
If you are building or maintaining muscle, remember that adequate protein works alongside resistance training, overall nutrition and recovery. Your requirements may change as your bodyweight, training and goals change.
Illustrative example: a 145 g daily target split across four meals is about 36 g per meal.
4. Method and further reading
The calculator multiplies the selected reference bodyweight by an evidence-informed protein range expressed in grams per kilogram per day.
Daily protein (g) = bodyweight (kg) × protein recommendation (g/kg/day)
Different goals and training activity levels affect the selected reference range, but the result is not an individually measured requirement. The strongest evidence relates to adequate protein during consistent resistance training.
Morton RW et al. (2018). “A systematic review, meta-analysis and meta-regression of the effect of protein supplementation on resistance training-induced gains in muscle mass and strength in healthy adults.” British Journal of Sports Medicine. The findings support around 1.6 g/kg/day as a useful average reference for resistance-training-related muscle gains, with uncertainty and individual variation. It is not a universal upper limit.
Jäger R et al. (2017). “International Society of Sports Nutrition Position Stand: protein and exercise.” Journal of the International Society of Sports Nutrition. This position stand supports higher protein intakes for many exercising individuals, commonly around 1.4–2.0 g/kg/day, depending on circumstances.
The British Nutrition Foundation’s adult protein guidance references the UK adult Reference Nutrient Intake of approximately 0.75 g/kg/day. This is a population reference for basic nutritional requirements, not a target specifically designed to maximise muscle growth.
Helms E et al. (2014). “A systematic review of dietary protein during caloric restriction in resistance trained lean athletes: a case for higher intakes.” This research discusses higher intakes during energy restriction in lean, trained athletes; it should not be applied automatically to the general population.
This calculator provides general educational estimates for adults. Protein requirements may differ during pregnancy, breastfeeding, illness, recovery from injury or when managing certain medical conditions, including kidney disease. Individual guidance may be appropriate in these circumstances.
