For carbohydrates in onion per 100g, raw onions average ~9.3 g carbs (about 7.6 g net after fiber).
Onions bring light sweetness, aroma, and crunch to meals while staying modest on carbs. If you’re checking onion carbs for meal planning, this guide shows the numbers by type, by cooking method, and by common serving sizes. Figures below use reliable datasets and round to everyday values so you can plan quickly without a calculator.
Carbohydrates In Onion Per 100G: Raw, Cooked, And Varieties
The typical figure you’ll see for raw onion is near 9–10 grams of carbohydrate per 100 grams, with roughly 1.5–2 grams of fiber. That leaves net carbs around 7–8 grams per 100 grams. White, red, and sweet types sit close to each other, with small swings due to water and natural sugar differences.
TABLE #1 (broad, early, ≤3 cols, 7+ rows)
Carb Snapshot By Type Or Method (Per 100 Grams)
| Type / Method | Carbs (g/100g) | Notes |
|---|---|---|
| Raw Yellow Onion | ~9.3 | Common baseline; ~1.7 g fiber; ~7.6 g net carbs. |
| Raw White Onion | ~7.7 | Leaner on total carbs; crisp bite. |
| Raw Red Onion | ~9.0 | Similar to yellow; vibrant color from anthocyanins. |
| Raw Sweet Onion | ~7.6 | Higher water; gentle flavor. |
| Green/Spring Onion (Whole) | ~7.0–7.5 | Milder bulbs; more greens; generous water content. |
| Sautéed (No Sugar) | ~7.9–10.0 | Water cooks off, so grams per 100 g can shift upward. |
| Roasted/Grilled (Dry Heat) | ~9.5–11.0 | Concentration effect from moisture loss. |
| Caramelized (No Sugar Added) | ~10–12 | Slow pan time concentrates natural sugars; weight drops. |
| Dehydrated/Dried | ~80–86 | Almost all water removed; very dense per 100 g. |
For official reference points on vegetables, see the USDA’s onion page in SNAP-Ed’s produce guide, which gives practical context for selection and storage (USDA SNAP-Ed onions). For day-to-day carb counting with non-starchy vegetables, the American Diabetes Association also lays out sensible serving guidance (ADA non-starchy vegetables).
Onion Carbs Per 100 Grams: By Type And Method
Why do numbers vary across types and cooking styles? It comes down to water. Two samples at the same weight can hold different amounts of moisture. When onions cook, steam escapes, weight falls, and the grams of carbohydrate per 100 g can rise because there is simply less water in the spoonful.
Raw Types Compared
Yellow vs red vs white: yellow and red cluster near 9–9.5 g carbs per 100 g, while white often runs a bit lower. Sweet onions tend to show a smaller carb count per 100 g because they carry more water. The net carb result still lands in a tight range for all common bulbs.
Cooked Styles Compared
- Sautéed: a short pan cook softens bite and may nudge up the per-100 g carb number as moisture leaves. With no added sugar, the shift is about concentration, not extra carbs.
- Roasted or grilled: dry heat pulls more water, so per-100 g carbs often read higher than raw.
- Caramelized: longer time means more water loss and deeper flavor; per-100 g figures sit higher, even without any added sugar.
- Dried: almost no water remains, so the per-100 g figure is very high. Real-world servings are tiny, so total carbs per sprinkle stay modest.
Fiber And Net Carbs
Fiber trims the net carb figure a little. With ~1.5–2 g of fiber per 100 g in raw onion, net carbs land near 7–8 g per 100 g. That steady baseline helps when you size portions for soup, tacos, curries, and grills.
Carbohydrates In Onion Per 100G For Common Servings
Per-100 g data is handy, yet most of us slice or dice without weighing every bit. Use the portion guide below to map common kitchen amounts to grams of carbohydrate. For quick math, many cooks round raw onion to ~9.3 g carbs per 100 g and scale up or down by weight.
TABLE #2 (later, ≤3 cols)
Typical Portions And Carb Estimates
| Portion | Approx. Weight (g) | Estimated Carbs (g) |
|---|---|---|
| Thin Slice (About 1 Ring) | 10 | ~0.9 |
| Small Onion (Peeled) | 50 | ~4.7 |
| Medium Onion | 85 | ~7.9 |
| Large Onion | 150 | ~14.0 |
| ½ Cup Diced (Raw) | ~80 | ~7.4 |
| 1 Cup Diced (Raw) | ~160 | ~14.9 |
| ½ Cup Sautéed (No Sugar) | ~65 | ~5.5–6.6 |
How Cooking Changes The Numbers
No sugar added: when you sauté or caramelize onions without sugar, total carbs in the pan don’t jump; the grams per 100 g appear higher because the food loses water and weighs less per scoop. If you add sugar or glazes, that’s extra carbohydrate on top of the onion’s base.
Oil And Fat Don’t Add Carbs
Oil can add calories, but not carbs. If you’re tracking carbs tightly for a target, watch added sweeteners, not cooking fat. A low-heat pan with a light oil coat keeps texture soft while keeping carb math simple.
Batch Prep Tip
Cook a large batch once, portion into containers, and label the net carbs per container. Use a kitchen scale for the cooked weight so you can reuse the same per-100 g math later in the week.
Ways To Keep Carb Math Consistent
Pick One Set Of Reference Numbers
For most home cooking, using ~9.3 g carbs per 100 g for raw onion and ~7.6 g net carbs per 100 g keeps tracking steady across recipes. That removes guesswork when you swap types on the fly.
Measure Once For A Favorite Cut
Dice an onion the way you like, weigh one cup, and jot that weight in your notes. Then you can multiply or divide without re-measuring each time. This keeps your carbohydrates in onion per 100g math aligned with your kitchen habits.
Watch Hidden Adds
- Jarred sauces: many include sugar or starches. Add those carbs separately.
- Coatings: dredges and batters add starch. Factor those grams in.
- Glazes: a sweet finish adds quick sugar; log it on top of the onion base.
Onions And Meal Planning
Onions sit in the non-starchy vegetable camp and work well in meals that aim for steady blood glucose. ADA serving guidance for non-starchy vegetables keeps portions simple and flexible for mixed plates. If you weigh ingredients for precise dosing, stick with gram-based entries and repeat the same method from cook to cook.
Flavor Strategies With Steady Carbs
- Raw crunch: a thin slice on tacos or salads adds snap for very few carbs per bite.
- Quick sauté: five to seven minutes in a hot pan turns sharpness into gentle sweetness without changing the total carbs in your pan.
- Roast tray: wedges roast well beside peppers and zucchini; carb math stays predictable, and the browned edges bring depth.
- Slow caramelize: long time, low heat; per-100 g carbs read higher due to water loss, but the whole-pan carbs stay the same unless you add sugar.
Numbers You Can Trust (And How To Use Them)
The anchor numbers in this article align with widely used nutrition datasets. The SNAP-Ed page above gives an official vegetable reference, while ADA’s non-starchy vegetable list frames onions within simple servings. For raw onion macro details per 100 g, MyFoodData compiles data from the USDA database and presents it in a clean label format that matches kitchen use (raw onion 100 g facts).
Practical Logging
If you log food in an app, search for entries that state serving weight in grams. Choose one raw entry and one cooked entry you trust, and favorite them. This keeps “carbohydrates in onion per 100g” tracking consistent across weeks.
Bottom Line For Everyday Cooking
Plan on ~9–10 g carbohydrate per 100 g raw onion with ~1.5–2 g fiber. Net carbs land near 7–8 g per 100 g for most bulbs. Cooking without sugar doesn’t add carbs; it concentrates them per 100 g as water drops. Use the portion table, weigh once for your favorite dice, and you’ll keep meals tasty and the math easy.