Protein Intake Calculator
Protein Intake Calculator: How Much Protein Do You Need?
Personalized daily target based on your weight, goal, and age — built on current sports-nutrition research, not the outdated RDA minimum.
Please fill in your weight and age.
Spread it across your day (muscle protein synthesis peaks at ~30–40 g per meal)
What your daily target looks like in food
Targets follow ranges used in sports-nutrition research (ISSN position stands): 0.8–1.0 g/kg for general health, 1.4–2.0 g/kg for active adults and muscle gain, up to 2.4 g/kg when dieting to preserve lean mass, with an upward adjustment after age 50. Estimates only — not medical advice. People with kidney conditions should consult a doctor before increasing protein.
How Much Protein Should I Eat Per Day? (Science-Based Targets by Age and Goal)
“Eat more protein” might be the only piece of nutrition advice that bodybuilders, dietitians, and longevity researchers all agree on. But when you ask the obvious follow-up — how much, exactly? — the answers suddenly range from a modest 50 grams a day to “one gram per pound of body weight or your muscles will vanish.”
The truth sits on solid scientific ground, and it depends on exactly three things: your body weight, your goal, and your age. That last one is the factor almost every protein guide ignores — and if you’re over 50, it changes your target more than anything else.
👉 Want your number right now? The calculator at the top of this page builds your personalized daily protein target from your weight, goal, and age — including the higher requirements of adults over 50 — and splits it into a practical per-meal plan. Get your number, then read on to understand the science behind it.
The Quick Answer: Protein Targets by Goal
Here are the evidence-based daily ranges, expressed per kilogram of body weight (divide your weight in pounds by 2.2 to get kilograms):
| Your situation | Daily protein target | For a 180 lb (82 kg) person |
|---|---|---|
| Sedentary, general health | 0.8–1.0 g/kg | 65–82 g |
| Regularly active | 1.2–1.6 g/kg | 98–131 g |
| Building muscle | 1.6–2.2 g/kg | 131–180 g |
| Losing fat (preserving muscle) | 1.8–2.4 g/kg | 148–197 g |
| Endurance training | 1.2–1.7 g/kg | 98–139 g |
| Adults 50+ (any goal) | at least 1.2–1.6 g/kg | 98–131 g minimum |
Notice something? Every active category lands far above the official RDA. That’s not a contradiction — it’s a misunderstanding of what the RDA was ever meant to be.
Why the RDA (0.8 g/kg) Is a Minimum, Not a Target
The Recommended Dietary Allowance for protein — 0.8 grams per kilogram of body weight — is the single most misquoted number in nutrition. It was never designed as an optimal intake. It is the estimated minimum needed to prevent deficiency in a sedentary adult: enough to avoid losing muscle, not enough to build it, protect it during a diet, or fight age-related decline.
Think of it like the minimum wage of nutrition — you can survive on it, but nobody would call it thriving. The International Society of Sports Nutrition’s position stand concludes that for building and maintaining muscle, most active people do best with a daily intake of 1.4–2.0 g/kg — roughly double the RDA — and that higher intakes are safe for healthy individuals.
Protein by Goal: What the Research Actually Supports
Building muscle: 1.6–2.2 g/kg
A landmark meta-analysis of resistance-training studies found that muscle-building benefits from protein plateau at roughly 1.6 g/kg per day for most people — with the upper range (up to 2.2 g/kg) acting as insurance for hard trainers, leaner individuals, and anyone whose intake varies day to day. Eating dramatically beyond that range doesn’t build extra muscle; it just makes expensive protein powder redundant.
Losing fat: 1.8–2.4 g/kg — the higher, the better protected
Protein does its most impressive work during a caloric deficit, defending you on three fronts at once. It preserves lean mass while you lose weight, so the scale drop comes from fat rather than muscle. It’s the most satiating macronutrient, blunting the hunger that kills most diets. And it carries the highest thermic effect of any macro — your body burns 20–30% of protein’s calories just digesting it, compared with 5–10% for carbs and 0–3% for fat.
That’s why protein and your calorie target work as a pair: set your deficit first with our TDEE calculator, then fill a generous share of those calories with protein. And if you want to verify the weight you’re losing is actually fat, track your body composition with the body fat calculator — the scale alone can’t tell muscle from fat.
Endurance training: 1.2–1.7 g/kg
Runners and cyclists often assume protein is “for lifters.” In reality, long training sessions break down muscle protein for fuel, and endurance athletes need meaningfully more than sedentary adults to repair that damage — just not quite as much as dedicated muscle-builders.
Protein After 50: The Factor Most Guides Ignore
Here is where generic protein advice quietly fails millions of people. From roughly age 50 onward, the body develops anabolic resistance — the same dose of protein triggers a weaker muscle-building response than it did at 30. Meanwhile, adults lose an estimated 3–8% of muscle mass per decade after 30, a slide that accelerates after 60 and has a clinical name: sarcopenia.
Muscle in later life isn’t about aesthetics. It’s the difference between rising from a chair unassisted or not, between catching yourself in a stumble or breaking a hip. Grip strength — a simple proxy for total muscle — is one of the strongest physical predictors of longevity in older adults.
Because of anabolic resistance, international expert groups studying protein and aging (such as the PROT-AGE study group) recommend that healthy older adults consume at least 1.0–1.2 g/kg daily — and 1.2–1.5+ g/kg when active or recovering from illness — substantially above the standard RDA. Our calculator applies this adjustment automatically: enter an age of 50 or above and your minimum target rises accordingly.
Pairing that higher intake with resistance training is the single most evidence-backed anti-aging intervention available — more on that in our Longevity Habits guides.
Per-Meal Distribution: Why 200 g at Dinner Doesn’t Work
Total daily protein matters most, but distribution is the tiebreaker. Muscle protein synthesis — the process that actually builds and repairs tissue — is switched on by each protein-containing meal, peaks at roughly 30–40 grams per sitting, and then needs a few hours before it can be fully stimulated again.
The practical consequence: someone who eats a token 10 g breakfast, a 20 g lunch, and a 100 g protein feast at dinner stimulates less total muscle building than someone eating the same 130 grams split into four even doses. Aim for 3–5 meals of roughly 30–40 g each — exactly the split our calculator generates for you.
If you practice time-restricted eating, this is very achievable inside an 8-hour window (three solid meals), but it gets genuinely difficult on OMAD — one more reason to choose your fasting protocol deliberately with the intermittent fasting calculator.
A Worked Example: Mark’s Numbers
Mark is 56 years old, weighs 190 lb (86 kg), lifts weights three times a week, and wants to build muscle while staying lean.
Step 1 — Base range for muscle building: 1.6–2.2 g/kg
Step 2 — Age adjustment (56 > 50): the floor stays at 1.6 g/kg — already above the senior minimum — so anabolic resistance makes the middle-to-upper end of the range his smart target.
Daily target: ~86 kg × 1.9 g/kg ≈ 163 g of protein per day
The plan: four meals of ~40 g each. In food terms that’s roughly a 3-egg omelet with Greek yogurt at breakfast, a chicken breast salad at lunch, a tuna-and-cottage-cheese snack, and a salmon dinner. Ambitious — but entirely doable, and transformative for muscle retention at his age.
What Does 130 g of Protein Look Like in Food?
| Food | Serving | Protein |
|---|---|---|
| Chicken breast | 1 breast (~120 g cooked) | ~31 g |
| Salmon | 1 fillet (~150 g) | ~30 g |
| Greek yogurt (plain) | 1 cup (245 g) | ~17 g |
| Eggs | 2 large | ~12 g |
| Lentils (cooked) | 1 cup | ~18 g |
| Cottage cheese | 1 cup | ~25 g |
| Firm tofu | 1 cup | ~20 g |
| Whey protein | 1 scoop | ~24 g |
A useful mental shortcut: one palm-sized portion of meat, fish, or tofu ≈ 25–30 g of protein. Hit one palm per meal, four times a day, and most targets take care of themselves.
Can You Eat Too Much Protein? (The Kidney Question)
The claim that high-protein diets damage kidneys traces back to a real clinical fact taken out of context: people with existing kidney disease are often prescribed protein restriction. In healthy individuals, however, research — including the ISSN review cited above — has not found kidney harm from intakes even well above 2 g/kg. Your kidneys adapt their filtration rate to workload the same way your muscles adapt to training.
Two honest caveats. First, if you have diagnosed kidney disease, diabetes with kidney involvement, or a family history of renal problems, talk to your doctor before raising your protein. Second, “more is always better” fails on practical grounds: past your target range, extra protein mostly displaces the carbs and fats that fuel training and hormone production — and strains your grocery budget for zero additional muscle.
Frequently Asked Questions
Is 100 grams of protein a day enough?
It depends entirely on your weight and goal. For a 130 lb (59 kg) person building muscle, 100 g lands nicely in the optimal range. For a 220 lb (100 kg) person trying to lose fat while keeping muscle, it falls well short. This is exactly why per-kilogram targets beat one-size-fits-all numbers — use the calculator above for yours.
Should I use grams per pound or grams per kilogram?
They’re the same science in different units. The popular gym rule “1 gram per pound of body weight” equals 2.2 g/kg — the very top of the evidence-based muscle-building range. It works, but for most people it’s more than necessary; 0.7–0.8 g per pound (1.6–1.8 g/kg) captures nearly all the benefit.
Do I need protein shakes to hit my target?
No — they’re a convenience, not a requirement. Whole foods bring micronutrients, fiber, and satiety that powders don’t. That said, a shake is a perfectly good tool when a 30–40 g whole-food meal isn’t practical, especially for breakfast or post-workout, and for older adults with smaller appetites.
Does plant protein count the same as animal protein?
Almost. Plant proteins are slightly lower in leucine — the amino acid that triggers muscle protein synthesis — and some are less digestible. Vegans and vegetarians can fully compensate by aiming at the higher end of their range (add roughly 10–20%) and mixing sources (legumes + grains + soy) across the day.
Is it bad to eat all my protein at night?
It’s not dangerous, but it’s inefficient. Muscle protein synthesis maxes out at roughly 30–40 g per meal, so a single massive dose leaves stimulation on the table compared with spreading the same grams across 3–5 meals. If your schedule forces uneven eating, total daily intake still matters most — distribution is the optimization, not the foundation.
Written by the RegenStep Editorial Team and reviewed for factual accuracy against published research, including position stands from the International Society of Sports Nutrition and the PROT-AGE study group. This article is for educational purposes only and is not medical advice. Consult a qualified healthcare professional before making significant dietary changes, particularly if you have kidney disease, diabetes, or other chronic conditions.