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How Much Protein Do I Need? A Complete Guide
By the CountProtein team · Last updated August 10, 2026
Most adults need somewhere between 0.8 and 1.2 grams of protein per kilogram of body weight a day — the low end for a sedentary younger adult, the high end for adults over 50 or anyone active. For a 70 kg (154 lb) person, that's roughly 56 to 84 grams daily. The exact number depends on your age, weight, and how active you are, and it matters less than most people think exactly when you eat it.
How much protein do you actually need?
Protein need scales with body weight and changes with age and activity. General adult guidance from the USDA's MyPlate framework treats protein as one of the core food groups to build every plate around. Once you pass 50, an international expert group called PROT-AGE recommends stepping up to 1.0–1.2 g/kg — noticeably more than the general baseline, because aging muscle responds less efficiently to protein than younger muscle does. If you strength train, the useful range extends further, up to about 1.6 g/kg. (Our guide to protein after 50 covers the age-related side of this in depth.)
Quick answer, by age and activity
| Who | Daily target |
|---|---|
| Adult, mostly sedentary | ~0.8 g/kg |
| Adult over 50 | 1.0–1.2 g/kg |
| Active adult / regular strength training | 1.2–1.6 g/kg |
| Per meal, to trigger muscle building (any age 50+) | ~30 g |
For your exact number, the protein calculator does this math for you.
How to spread protein across the day
Total daily grams matter, but so does how you divide them up. Research on the 0.4 g/kg × 4 meals framework suggests aiming for a similar-sized protein dose at each meal, rather than a light breakfast and a protein-heavy dinner. A study on meal distribution found that spreading protein evenly across meals built more muscle than loading it all at once, and separate research on the 30 g meal ceiling found that around 30 grams per meal is roughly where the muscle-building signal maxes out — more than that in one sitting doesn't add much extra.
What actually counts as "a serving"?
Most people underestimate protein because they don't have a mental picture of a serving. Some everyday comparisons, from the MedlinePlus portion guide and the American Heart Association's serving-size guide:
| Food | Everyday comparison | About |
|---|---|---|
| Meat, poultry, or fish (3–4 oz) | A deck of cards, or your palm | ~22–26 g protein |
| One egg | A golf ball | ~6 g protein |
| Greek yogurt (1 container) | A tennis ball, roughly | ~16–20 g protein |
| Cheese (1.5 oz) | Three dice stacked | ~10–12 g protein |
For exact numbers on specific foods, see grams of protein in 45 everyday foods, pulled straight from our food database.
Does timing around exercise matter?
Less than the fitness industry once claimed. The International Society of Sports Nutrition's position on timing has moved away from a strict post-workout "anabolic window." What matters more is hitting your daily total and spreading it across meals — protein eaten sometime within a few hours of training works fine for almost everyone.
Common protein myths
Myth: high protein always damages your kidneys. In people with healthy kidneys, research has not found that higher protein intake harms kidney function. The exception is real kidney disease, where protein needs are different and should be set by your care team. If you use protein supplements and have any kidney concerns, the American Kidney Fund's guidance on protein supplements is worth a read too.
Myth: more protein is always better. For muscle building, benefits appear to level off around 1.6 g/kg per day — eating well past that hasn't shown extra benefit in most studies.
Myth: plant protein "doesn't count" the same way. The amino acid leucine is the main trigger for muscle building, and while plant foods generally have less leucine per gram than meat, dairy, or eggs, a varied plant-based diet with enough total protein can still meet your target — see the special diets guide for specifics.
Frequently asked questions
How much protein do I need in a day?
It depends mostly on age and activity. A general baseline for adults is roughly 0.8 grams per kilogram of body weight, but adults over 50 do better around 1.0–1.2 g/kg, and that moves toward 1.6 g/kg if you strength train regularly. The protein calculator gives you an exact number for your own age, weight, and activity level.
What counts as a serving of protein?
A deck of cards or the palm of your hand is a good visual guide for about 3–4 ounces (85–115 g) of meat, fish, or poultry — roughly 22–26 grams of protein. An egg is about 6 grams; a cup of Greek yogurt is around 16–20 grams. The USDA's MyPlate guidance uses similar everyday comparisons.
Do I need to eat protein right after exercise?
No — sports-nutrition guidance on protein timing has moved away from a strict "anabolic window." What matters more is your total daily protein and spreading it across meals; eating protein sometime within a few hours of training is fine.
Does eating too much protein hurt your kidneys?
In people with healthy kidneys, research has not found that higher protein intake damages kidney function. If you already have kidney disease, protein needs are different and should be set by your doctor or a renal dietitian — that's the one group this general guidance doesn't apply to.
Is there a point where more protein stops helping?
For building and keeping muscle, yes — benefits tend to level off around 1.6 grams per kilogram of body weight per day. Eating well beyond that hasn't been shown to add extra muscle-building benefit for most people.
Get your personal number
Skip the math — the free protein calculator adjusts for your age, weight, sex, and activity level in about 30 seconds. No login required.
Try the protein calculatorKeep reading
- Protein After 50 — Why protein needs go up as you age, and the target that actually works.
- Gluten-Free & Low-FODMAP Protein — Gluten-free and low-FODMAP protein sources, explained without the guesswork.
- Grams of Protein in Foods — Real protein counts for 45 everyday foods, pulled straight from our food database.
General information, not medical advice. Talk with your doctor or dietitian about your own needs.