Protein calculator for adults over 50

Get your age-adjusted daily protein target in under a minute.

Turning 50 changes how much protein your body actually needs — and most online protein calculators never adjust for it. They run everyone through the same young-adult formula, whether you're 25 or 75, active or recovering from a knee replacement. That gap matters: research from the PROT-AGE Study Group and the European Society for Clinical Nutrition and Metabolism (ESPEN) both point to older adults needing meaningfully more protein than the standard 0.8 g/kg adult RDA, just to hold onto the muscle they already have.

The reason comes down to biology, not just calories. As you age, your muscle becomes less responsive to a given dose of protein — a phenomenon researchers call anabolic resistance. A protein amount that used to be plenty at 30 stops being enough to fully trigger muscle protein synthesis at 65. Layer on typical age-related muscle loss (sarcopenia, which can take 3–8% of muscle mass per decade after 30, accelerating after 60), and it's easy to see why the science settled on a higher floor: 1.0–1.2 g/kg/day at baseline, rising toward 1.6 g/kg/day for those who are also resistance training.

This calculator uses that exact age-adjusted math — the same engine behind the CountProtein app — and adds one more layer most calculators skip entirely: a per-meal target. Because older muscle needs a bigger single dose to respond, hitting your daily number in one meal at dinner isn't nearly as effective as spreading roughly 30 g or more across three to four meals. Answer the five questions below and you'll get both numbers, plus what they look like in everyday food.

Calculator

How old are you?
What is your sex? (for context only — it doesn't change your numbers)
Whole or decimal numbers both work, e.g. 165 or 74.5
How active are you most weeks?

Your daily protein target

–g / day

About – g per meal, spread across 3–4 meals a day.

  • – large eggs

  • – deck-of-cards chicken portions (85 g each)

  • – g nonfat Greek yogurt

Protein values from USDA FoodData Central and the Canadian Nutrient File. Portion-size guide: MedlinePlus.

Questions from adults 50+

Why do protein needs go up after 50?

Aging brings two changes that raise your protein needs: anabolic resistance (older muscle responds less to a small protein dose, so it takes more per meal to trigger muscle building) and a natural decline in muscle mass called sarcopenia. The PROT-AGE Study Group's 2013 review puts the baseline at 1.0–1.2 g/kg/day for healthy older adults — 25–50% above the standard adult RDA of 0.8 g/kg.

I'm 50+ but not very active. Should I still aim higher than 0.8 g/kg?

Yes — the 1.0–1.2 g/kg baseline in the research applies regardless of activity level; it's a floor for healthy aging, not a bonus for exercisers. Activity raises the target further, but even someone who selects "mostly sitting" in the calculator above gets 1.0 g/kg, not the standard adult 0.8 g/kg.

Is a high-protein diet safe for my kidneys as I age?

In people with healthy kidneys, research hasn't found that higher protein intake harms kidney function over time. But kidney function can decline with age even without diagnosed disease, so if you've been told you have a kidney condition, check the box above — we'll route you to National Kidney Foundation guidance instead of a generic number.

I have arthritis or limited mobility. Which activity level should I choose?

Pick the option that honestly describes your typical week, not your goal. "Mostly sitting" or "lightly active" are completely valid choices — the calculator still gives you a meaningfully higher target than the standard adult RDA, because the age-related increase applies before activity is even factored in.

Track your target automatically

CountProtein turns this number into a daily habit — snap a photo of your meal and see your grams, built for adults 50+ from the ground up.

Track it with the app

Read more: Protein after 50 · Full calculator + methodology