Protein Needs Calculator
For women 40+, based on published research
Most women over 40 need more protein than the standard RDA suggests \u2014 not because the RDA is wrong, but because it was set to prevent deficiency, not to protect muscle. This calculator gives you a research-based daily range using your weight and activity level, plus how to spread it across meals.
Interactive Tool
How We Calculated This
The standard RDA of 0.8g of protein per kilogram of body weight is a minimum to prevent deficiency \u2014 not an optimal target for maintaining muscle as you age. After 40, a phenomenon called “anabolic resistance” means your body needs more protein per meal to trigger the same muscle-building response it once achieved with less. Research on physically active adults, including a large meta-analysis showing benefits plateauing around 1.6g/kg, and the International Society of Sports Nutrition’s position that 1.4\u20132.0g/kg is both safe and effective for active individuals, form the basis of the ranges used here.
Frequently Asked Questions
Why is this higher than what I’ve read elsewhere?
Short answer
Because most general protein guidelines are written for the general population, not specifically for women over 40 who are trying to preserve muscle.
Evidence
The 0.8g/kg RDA is a deficiency-prevention threshold, not a muscle-preservation target. Research specific to older adults and resistance-trained individuals consistently points higher.
Does this apply if I don’t exercise?
Short answer
Yes, but your target will be lower.
Evidence
The calculator adjusts down for sedentary activity levels \u2014 even without exercise, protein needs after 40 are still generally higher than the bare RDA due to age-related changes in how the body uses protein.
Is there a downside to eating more protein than this range?
Short answer
For most healthy people, no \u2014 but check with a doctor if you have kidney disease.
Evidence
People with impaired kidney function need to manage protein intake carefully, since the kidneys process protein byproducts. This calculator is not personalized medical advice.