Protein Calculator
Estimate an educational daily protein range from body weight, activity level, and general goal using kilograms or pounds.
Calculate your estimate
What this tool tells you
Protein recommendations are commonly expressed in grams per kilogram of body weight per day. This calculator starts with body weight, then uses both activity and goal to select a range instead of presenting one supposedly perfect number.
How the estimate works
The adult RDA reference is 0.8 g/kg/day. The calculator uses 0.8–1.4 g/kg/day across general-health activity levels and evidence-informed ranges up to 2.0 g/kg/day for active, resistance-training, or lean-mass-preservation contexts. Weight in pounds is converted to kilograms using 1 lb = 0.45359237 kg. The selected lower and upper g/kg values are multiplied by body weight, then rounded to whole grams. Meal figures simply divide the daily range by three or four.
Important limitations
This tool is for generally healthy adults and does not assess dietary quality, total energy intake, body composition, training load, pregnancy, childhood, kidney disease, or other medical needs. Higher is not automatically better. Older adults with health considerations and athletes in specialized programs may also need individualized guidance from a qualified professional.
Frequently asked questions
Is 0.8 g/kg enough for everyone?
It is the adult RDA reference for many healthy adults, not an optimal target for every activity level, age, or goal.
Does protein alone build muscle?
No. Resistance training, sufficient total energy, recovery, and overall diet all matter.
Do I need protein powder?
Not necessarily. Many people can meet protein needs with food. Supplements are a convenience rather than a requirement.
Can I use this with kidney disease?
No. Kidney disease can change protein needs. Follow individualized advice from your healthcare team or renal dietitian.
Understand your protein range
Explore the adult reference, exercise contexts, calculation method, and situations where general estimates are not enough.