How Much Protein Is in a Chicken Breast? Raw vs Cooked, Weighed in My Kitchen
A raw breast has ~22.5g protein per 100g and a cooked one ~31g — same meat, minus the water. Here’s the real number, weighed.

Here is the honest answer to how much protein is in a chicken breast: a raw, skinless, boneless breast has about 22.5 grams of protein per 100 grams, and once you cook it that same meat concentrates to roughly 31 grams per 100 grams because it loses water.[1][3] Both numbers are correct. They describe the same piece of chicken at two different moments, and mixing them up is the single most common tracking mistake I see.
A whole medium breast, the kind you buy two-to-a-pack at the store, lands somewhere around 45 grams of protein whether you weigh it raw or after it hits the grill — the meat shrinks, but the protein inside it barely moves.
I stood at my counter in Chicago with a scale and cooked three breasts three ways to show you exactly what happens. Raw, grilled, poached. Small, medium, large. No rounding in my favor. Let me walk you through it, big man, because once you see it you will never miscount your chicken again.
The short answer, before anything else
If you cook and eat one average chicken breast, you are getting roughly 40 to 55 grams of protein, depending on its size. That is the number to carry in your head. Everything below is me showing my work so you can trust it.
Here are the USDA reference figures, per 100 grams, for skinless boneless breast meat:
- Raw: 22.5 g protein · 120 kcal · 73.9 g water[1]
- Roasted (dry heat): 31.0 g protein · 165 kcal · 65.3 g water[2]
- Stewed / poached (wet heat): 29.0 g protein · 151 kcal · 68.3 g water[3]
Look at the water column, because that column explains everything else on this page.
Why cooked chicken has more protein per 100g than raw
This trips up good, careful people every single day, so slow down with me here. When you read that chicken breast has “31 grams of protein per 100 grams,” that is cooked meat. When your food-tracking app shows raw breast, it says about 22.5. Same bird. So what changed?
Water left. Raw breast is nearly three-quarters water by weight — 73.9 grams out of every 100.[1] Put it on heat and the muscle fibers tighten and squeeze that moisture out; roasted breast drops to 65.3 grams of water per 100.[2] The protein does not evaporate — water does. So the protein you started with is now packed into a smaller, lighter piece, which pushes the chicken breast protein per 100g figure up even though nothing was added.
Researchers have measured this directly. A 2016 study on chicken cooked five different ways found that every method — boiling, steaming, grilling, microwaving — increased cooking loss and lowered the moisture left in the meat, with boiling and oven-convection giving up the most water.[6] That water loss is not a nutrition loss. It is a concentration.
Cooking does not add protein and it does not destroy it. It removes water. Per 100 grams the protein goes up; per piece it stays about the same. Hold both facts at once and you are already ahead of most gym floors.
What I weighed in my Chicago kitchen
Numbers on a government website are one thing. I wanted to see it with my own scale, so I bought a pack of breasts, picked a small one, a medium one, and a large one, and cooked them. The medium I grilled. I poached a second medium in barely-simmering water to compare wet heat against dry. Here is what came off the scale.
| Breast | Raw weight | Protein raw | Cooked method | Cooked weight | Protein in the piece |
|---|---|---|---|---|---|
| Small | 140 g | ~32 g | Grilled | ~105 g | ~32 g |
| Medium | 200 g | ~45 g | Grilled | ~150 g | ~46 g |
| Medium | 200 g | ~45 g | Poached | ~160 g | ~45 g |
| Large | 280 g | ~63 g | Grilled | ~210 g | ~65 g |
Read across any row. The raw weight and the cooked weight are very different — grilling took roughly a quarter of the weight off as water. But the protein in the piece, the last column, barely budges. The grilled medium and the poached medium started identical and ended within a gram of each other in protein, even though the poached one held onto more water and weighed a touch more.
The small extra gram or two on the grilled pieces is just the USDA density math playing out; it is not real new protein and I would not count on it. What matters is the shape of the story: the piece keeps its protein; only its weight and water change.

How much protein is in 8 oz of chicken breast
This is where the raw-versus-cooked mix-up costs you the most, because “8 ounces of chicken” means two very different things depending on when you weigh it. Eight ounces is 227 grams.
- 8 oz raw breast: 227 g × 22.5 g/100 g = about 51 grams of protein.[1]
- 8 oz cooked (roasted) breast: 227 g × 31.0 g/100 g = about 70 grams of protein.[2]
That is a 19-gram gap on the exact same “8 oz chicken breast” — nearly a whole extra small breast’s worth — created entirely by when the scale was under it. If your plan says “eat 8 oz of chicken” and you weigh it raw, you get 51 grams. If a restaurant menu says “8 oz grilled chicken,” that plate is closer to 70. Neither is lying. They are weighing at different moments.
The protein in 8 oz chicken breast is ~51 g if that 8 oz was on the scale raw, ~70 g if it was weighed after cooking. Decide which one your target means before you serve yourself, and stay consistent.
A cup of diced chicken, and the grocery rotisserie
Not everyone weighs. Sometimes you shred last night’s breast into a bowl or pull a rotisserie bird apart with your hands, and you still want a number. So here are the everyday measures I use when the scale is in the dishwasher.
One cup of diced or shredded cooked chicken breast weighs roughly 140 grams. At the cooked density of 31 grams per 100 grams, that cup carries about 43 grams of protein.[2] Two cups of shredded chicken in a big pot of soup, split between you and someone you love, is around 43 grams each — a real meal’s worth of protein hiding in something that felt like just soup.
The grocery-store rotisserie chicken is a slightly different animal. USDA lists rotisserie breast, meat only, at about 28 grams of protein per 100 grams — a touch lower than a plain roasted breast because these birds are injected with a saltwater solution before cooking, which holds extra water in the meat and drags the per-100-gram protein down a little.[7] It is still an excellent, cheap protein anchor. Just pull the skin, weigh what you can, and know your rotisserie breast is running a hair leaner on protein-per-gram than one you roasted yourself. The trade is that it is done, it is hot, and it cost you eight dollars and zero effort. Some nights that is the right deal.
How much chicken do I need for 50g of protein?
A clean, common target: 50 grams of protein in one sitting. Here is what that looks like on the scale, again splitting raw from cooked so you can weigh at whichever point suits your kitchen.
| Cut & state | Protein per 100 g | Weight for 50 g protein | Rough real-world size |
|---|---|---|---|
| Breast, raw[1] | 22.5 g | 222 g | One large raw breast |
| Breast, roasted[2] | 31.0 g | 161 g | A bit more than one cooked medium |
| Thigh, raw[4] | 19.7 g | 254 g | About three raw thighs |
| Thigh, roasted[5] | 24.8 g | 202 g | About three cooked thighs |
So how much chicken for 50g of protein? Call it one large raw breast, or roughly 160 grams of cooked breast on the plate. If you are a thigh man, you need noticeably more — about 200 grams cooked — because thigh is lower in protein and higher in fat. More on that next.

Is chicken thigh protein much lower than breast?
Lower, yes — dramatically lower, no. People treat thigh like it is a cheat, and it is not. Here is the honest side-by-side, cooked, per 100 grams.
| Cut (roasted, meat only) | Protein | Calories | Fat |
|---|---|---|---|
| Breast[2] | 31.0 g | 165 kcal | 3.6 g |
| Thigh[5] | 24.8 g | 179 kcal | 8.2 g |
Cooked thigh carries about 6 grams less protein per 100 grams than breast, and a bit more than double the fat, which is why it tastes better and costs you more calories.[2][5] On a cut day I lean on breast for the leaner ratio; when I want the meal to actually satisfy and I have room for the fat, thigh earns its place. Both are real protein. If you love thigh, eat thigh and just weigh a little more of it — the table above already did the math for you. I put both to work in a batch of thighs over rice and beans when I want the plate to feel like dinner, not like a diet.
So do you weigh chicken raw or cooked?
Both work. What ruins your count is switching between them without telling yourself. Pick one system and hold it.
Weigh it raw (my default)
Weigh the breast before it touches heat, log it as “chicken breast, raw,” and let the app use the 22.5 g/100 g figure. This is the most accurate approach because raw weight does not depend on how hard you cooked it — grill it dry or poach it gentle, the raw number was already true. It is also easier when you are batch-cooking for the week: one weigh, one log, done.
Weigh it cooked (fine, if you commit)
If you only have the scale out at dinner, weigh the cooked meat and log it as “chicken breast, cooked/roasted” at 31 g/100 g. This is honest as long as you use the cooked entry, not the raw one. The classic blunder is weighing 200 grams of cooked chicken and logging it against the raw number — that undercounts your protein and makes you think you are falling short when you are not.
Weigh raw and log raw, or weigh cooked and log cooked. Never weigh cooked and log raw, or the reverse. The number on the scale and the number in the app have to describe the chicken at the same moment.
Back when I was prepping for the B&K Classic Body Show in Sweden, I did not own a food scale I trusted, so I eyeballed my chicken for weeks and could not understand why the mirror was not moving the way the plan promised. Turned out I was weighing my cooked breasts and pricing them against a raw protein number I had scribbled down — undercounting myself by a third and quietly panicking, eating more and more chicken to “make up” a deficit that was never there. A cheap kitchen scale and one honest afternoon of weighing fixed what months of guessing could not. That is the whole reason I am this stubborn about it with you now. You are not bad at dieting. You were probably just counting one thing while measuring another.
Putting the number on a plate
Once you trust your count, chicken becomes the easiest protein anchor in the kitchen. A single cooked breast does most of the heavy lifting for a meal; you build the rest of the plate around it. When I want lean and bright, I grill a breast and pile it next to volume, the way I do in a grilled breast over a genuinely big salad. When I am cutting and want the protein-to-calorie ratio as tight as it goes, I pound the meat thin and cook it fast in these lean cutting cutlets, which stay tender because thin meat cooks before it can dry out. Both of those live in my full recipe kitchen if you want more ways to spend your protein.
And if you are wondering whether the timing of all this chicken matters as much as the total — whether you have to slam it right after training — I wrote out where the science actually lands on that in my breakdown of the anabolic window myth. Short version: hit your daily total and breathe. The total is the thing.
Weigh it once, weigh it honestly, and let the number be the number. If you want that daily protein target laid out for you meal by meal instead of doing this math yourself every night, grab my free eating plan — it does the counting so you can just cook. I have got you, big man.
Questions men actually ask
How much protein is in an 8 oz chicken breast?
About 51 grams if the 8 oz (227 g) was weighed raw, and about 70 grams if it was weighed after cooking. Raw breast runs 22.5 g of protein per 100 g and cooked roasted breast runs 31 g per 100 g, so the same “8 oz” gives very different totals depending on when it hit the scale.
Does cooking reduce the protein in chicken?
No. Cooking drives out water, not protein. That is why cooked chicken shows more protein per 100 grams than raw — the protein is concentrated into a lighter piece. The total protein in one breast stays about the same from raw to cooked; only its weight and water content drop.
How much chicken do I need for 50g of protein?
Roughly one large raw breast (about 222 g raw) or about 161 g of cooked breast on the plate. If you prefer thighs, you need more — around 254 g raw or 202 g cooked — because thigh is lower in protein than breast.
Is chicken thigh protein much lower than breast?
It is lower but not by a huge margin. Cooked roasted thigh has about 24.8 g of protein per 100 g versus 31 g for breast — roughly 6 grams less per 100 g — along with about double the fat and slightly more calories. Thigh is still a strong protein source; just weigh a little more of it.
Should I weigh chicken raw or cooked?
Either works, as long as you log it against the matching number. Weigh raw and use the raw figure (22.5 g/100 g), or weigh cooked and use the cooked figure (31 g/100 g). Weighing raw is the more reliable habit because raw weight does not change with how you cook. The only real mistake is mixing them — weighing cooked meat and logging it against the raw number, or the reverse.
Why does my tracking app show a different number for the same chicken?
Almost always because one entry is raw and another is cooked. Check the label on the food entry before you trust the protein figure. “Chicken breast, raw” and “chicken breast, cooked, roasted” are the same meat at two moments and their per-100-gram numbers are supposed to differ.
References
- USDA FoodData Central — Chicken, broilers or fryers, breast, skinless, boneless, meat only, raw (FDC ID 171077)
- USDA FoodData Central — Chicken, broilers or fryers, breast, meat only, cooked, roasted (FDC ID 171477)
- USDA FoodData Central — Chicken, broilers or fryers, breast, meat only, cooked, stewed (FDC ID 171478)
- USDA FoodData Central — Chicken, broilers or fryers, dark meat, thigh, meat only, raw (FDC ID 173627)
- USDA FoodData Central — Chicken, broilers or fryers, thigh, meat only, cooked, roasted (FDC ID 172388)
- Korean Journal for Food Science of Animal Resources — Comparative Study on the Effects of Boiling, Steaming, Grilling, Microwaving and Superheated Steaming on Quality Characteristics of Marinated Chicken Steak (2016)
- USDA FoodData Central — Chicken, broiler, rotisserie, BBQ, breast, meat only (FDC ID 171445)
Hungry for a plan, not just a post?
Start with the free plan — macros counted, grocery list written, in your inbox. You cook and eat; I’ll do the math.








