You cooked 200g of chicken breast. You look up "chicken breast" in your calorie app. It shows two options: raw (120 cal/100g) and cooked (165 cal/100g). You pick one. If you pick wrong, you've miscounted by 37% — on a single ingredient.
This is the most common calorie counting mistake, and it's completely avoidable.
Why Raw and Cooked Weights Are Different
When you cook food, it loses water. The calories don't change — they just get concentrated into less weight.
Example: 200g of raw chicken breast has 240 calories. After cooking, it weighs about 150g (25% water loss). Those same 240 calories are now in 150g of food. Per 100g: raw = 120 cal, cooked = 165 cal. Same chicken, same calories — different weight, different per-gram number.
This applies to everything:
| Food | Raw (per 100g) | Cooked (per 100g) | Water Loss |
|---|---|---|---|
| Chicken breast | 120 cal | 165 cal | ~25% |
| Ground beef 90% | 176 cal | 217 cal | ~25-30% |
| Salmon | 208 cal | 250 cal | ~20% |
| White rice | 374 cal | 130 cal | Gains 200% (absorbs water) |
| Pasta | 370 cal | 157 cal | Gains 140% (absorbs water) |
Notice: meat loses water (cooked is more calorie-dense per gram). Grains gain water (cooked is less calorie-dense per gram). If you mix these up, you get wildly wrong numbers.
The Mistake That Wrecks Your Count
Here's what goes wrong:
- Weighing cooked meat, logging raw values → You undercount. 150g cooked chicken logged as raw = 180 cal. Actual: 248 cal. You missed 68 calories.
- Weighing cooked rice, logging dry values → You massively overcount. 200g cooked rice logged as dry = 748 cal. Actual: 260 cal. You "lost" 488 calories that don't exist.
- Weighing raw pasta, logging cooked values → You undercount. 100g dry pasta logged as cooked = 157 cal. Actual: 370 cal. You missed 213 calories.
On a 1,500-calorie diet, a single raw/cooked mixup on one ingredient can throw your count off by 15-30%. Do this across multiple meals and your "1,500 calorie day" could actually be 1,800 or 1,200 — neither is what you intended.
The Rule: Pick One and Be Consistent
For meat, poultry, and fish: Weigh raw. It's more consistent because cooking methods affect water loss differently (baking vs grilling vs pan frying all produce different cooked weights from the same raw amount). Raw weight is the same every time.
For grains (rice, pasta, oats): Weigh dry before cooking. Much more precise than weighing cooked, which varies depending on how much water was absorbed. 75g of dry rice is always ~280 cal. 200g of cooked rice could be 200-280 cal depending on how much water it absorbed.
For vegetables: Don't worry about it. A cup of broccoli is 31 calories raw or cooked. The difference is negligible.
For everything else (eggs, bread, canned food, packaged food): Weigh as-is. The label tells you what you need.
What If You Already Cooked It?
Sometimes you forgot to weigh raw, and now it's cooked. What do you do?
- Weigh the cooked food
- Look up the cooked version in your calorie app — search for "chicken breast cooked" not just "chicken breast"
- Use the cooked values (165 cal/100g for chicken, 130 cal/100g for white rice)
This is less precise than weighing raw, but it's much better than using the wrong value. The key is matching your weight type (raw or cooked) to the correct calorie entry.
Common Foods: Raw vs Cooked Cheat Sheet
| Food | Weigh This | Cal per 100g | Note |
|---|---|---|---|
| Chicken breast | Raw | 120 | Cooked = 165/100g |
| Ground turkey 93% | Raw | 150 | Cooked = 187/100g |
| Ground beef 90% | Raw | 176 | Cooked = 217/100g |
| Salmon | Raw | 208 | Cooked = 250/100g |
| Rice | Dry | 374 | Cooked = 130/100g |
| Pasta | Dry | 370 | Cooked = 157/100g |
| Oats | Dry | 371 | Cooked = ~70/100g |
| Eggs | As-is | 143 | 1 large = 72 cal |
| Vegetables | Either | 10-35 | Difference negligible |
Keep this list handy. For more detailed breakdowns, check our calorie guides for chicken breast, rice, pasta, and eggs.
The Bottom Line
Weigh meat raw. Weigh grains dry. Match the weight type to the calorie value. One rule, applied consistently, eliminates the single biggest source of calorie counting errors.
A $10 kitchen scale + this rule = accurate calorie counts for life. No special app, no premium subscription — just the right number on the scale matched to the right number in the database.
