Do I weigh chicken raw or cooked?
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Either works, as long as the protein number matches the weight. Raw chicken breast has 22.5 g of protein per 100 g, and grilled has 30.5 g. Use the raw figure on a cooked weight and you undercount by about a quarter. Use the cooked figure on a raw weight and you overcount by about a third. 4 oz raw cooks down to about 3 oz, with about 25 g either way.
This trips up careful people the most. You weigh your chicken, you look it up, and you pick the first entry in the app, which might be raw or might be cooked. Then you eat the same breast every day for a month with a number that’s off by 7 to 9 g. On a day of chicken at two meals, that’s about a Greek yogurt you think you ate and didn’t, or the other way round.
We’d weigh raw when you cook for yourself, because the raw number is printed on the pack and it doesn’t depend on how long you left it in the pan. Weigh cooked when someone else cooked it. Either way, pick the matching entry.
It’s like weighing pasta. Dry or cooked both work, but you have to look up the right one, because cooked pasta is mostly water.
The mistake in grams
| What you weighed | What it really has | If you use the wrong number |
|---|---|---|
| 4 oz raw breast | 25.5 g | 34.6 g with the cooked figure (36% too high) |
| 3 oz cooked breast | 25.9 g | 19.1 g with the raw figure (26% too low) |
| 6 oz cooked breast | 51.9 g | 38.3 g with the raw figure (26% too low) |
| 8 oz raw breast | 51.0 g | 69.2 g with the cooked figure (36% too high) |
From USDA FoodData Central, worked by the same math as the raw or cooked calculator.
Why cooked chicken has more per gram
Cooking drives water out of the meat, and the protein stays in, so the cooked piece is lighter and more concentrated. If none of the protein leaves, 100 g of grilled breast started as about 136 g raw, which means it kept about 74% of its weight. USDA’s own piece weights agree, at 272 g raw against 196 g grilled (72%).
How much water leaves depends on the cooking. Worked from USDA’s records, 100 g of cooked breast started as about 136 g raw when grilled, 138 g roasted and 143 g braised. That spread is why the raw weight is the steadier one to use.
Other meats
| Meat | Raw, per 100 g | Cooked, per 100 g | 4 oz raw cooks to about |
|---|---|---|---|
| Chicken breast | 22.5 g | 30.5 g, grilled | 3 oz |
| Chicken thigh | 19.7 g | 24.8 g, roasted | 3.2 oz |
| 93/7 ground beef | 20.8 g | 28.9 g, browned | 2.9 oz |
A shortcut that’s close enough
For chicken breast, 4 oz raw and 3 oz cooked both carry about 25 g of protein. If you remember only one thing, remember that pair, and check your meal line in the meal line calculator.
For the rest of what’s in a breast, see how much protein is in chicken breast. The raw or cooked calculator converts any weight of chicken breast, thigh or ground beef, and shows the mistake in grams.
1 sources
- USDA FoodData Central, SR Legacy records 171077 (chicken breast, raw), 171534 (grilled), 173627 (thigh, raw), 172388 (thigh, roasted), 173110 (93/7 ground beef, raw) and 174755 (93/7 ground beef, pan-browned), with the breast's piece weightsfdc.nal.usda.gov
