How to Use the Daily Protein Needs Calculator
Protein recommendations aren't one-size-fits-all. Teenagers need more protein per pound of body weight to support bone and muscle growth, while adults over 65 need a higher minimum intake even at low activity levels to help slow age-related muscle loss known as sarcopenia. This calculator takes your age, weight, and usual activity level and returns a daily protein range that reflects these age-specific guidelines.
The baseline RDA for a sedentary adult is about 0.36g per pound of body weight, but that's a bare minimum for someone barely moving. Regular exercisers generally benefit from 0.5-0.7g per pound, and anyone actively building muscle should aim closer to 0.7-0.9g per pound to supply enough material for muscle repair and growth. Selecting your activity level automatically applies this multiplier.
Older adults often need a higher minimum — around 0.54g per pound or more — even at the same activity level, because muscle protein synthesis becomes less efficient with age (a phenomenon called anabolic resistance). These figures are general guidelines, so anyone with kidney disease or another condition affecting protein metabolism should check with a doctor or dietitian before adjusting intake.
Frequently Asked Questions
Teens need more protein per pound of body weight to support bone and muscle growth, while adults over 65 need a higher minimum even at low activity levels to help slow age-related muscle loss (sarcopenia).
Healthy adults with normal kidney function can generally handle intakes up to around 0.9g per pound of body weight safely, but anyone with kidney disease or on certain medications should talk to a doctor before increasing intake.