100 g of rolled oats is about 18 tablespoons, approximately. One tablespoon of rolled oats weighs 5.6 g, and one teaspoon weighs 1.9 g, so the arithmetic is simple: 100 g divided by 5.6 g per tablespoon gives 18 tablespoons. The figure comes from King Arthur Baking, measured spooned and levelled, and every result on this page is labelled approximate. Keep the scale nearby for anything that has to be exact.
Grains are sold by weight and cooked by volume, and the gap between the two is where recipes go wrong. A cup of rolled oats weighs 89 g, a tablespoon weighs 5.6 g, and 100 g is about 18 tablespoons — three numbers that describe the same ingredient in three different units. When a recipe gives one and your kitchen gives another, this page is the bridge between them, and the weight is the number you can trust most, because a cup of grains can be level or heaped and a scale does not care.
About Rolled Oats
Old-fashioned rolled oats, steamed and flattened. Oatmeal, cookies, granola and crumble toppings. That is why rolled oats shows up in recipes measured by the tablespoon as well as the cup: a tablespoon is the right unit for a coating or a small addition to a soup, while a cup is the unit for a pot of porridge or a side dish. Knowing that one tablespoon weighs 5.6 g lets you move between the spoon and the scale without stopping to work it out. Rolled oats are flat and light, so 100 g is eighteen tablespoons — a full bowl of porridge before the milk goes in.
Storage. Airtight container, cool and dry, up to 6 months.
Grams to tablespoons table
The table below converts grams of rolled oats into tablespoons, using 5.6 g per tablespoon. Use it when a recipe gives a weight and you want to measure by spoon, or when a packet tells you the weight and you want to know how many spoonfuls that is. All figures are approximate; verify with a kitchen scale when it matters.
| Grams | Tablespoons |
|---|---|
| 10 g | 1.8 tbsp |
| 20 g | 3.6 tbsp |
| 25 g | 4.5 tbsp |
| 30 g | 5.4 tbsp |
| 40 g | 7.2 tbsp |
| 50 g | 9 tbsp |
| 60 g | 10.8 tbsp |
| 70 g | 12.6 tbsp |
| 75 g | 13.5 tbsp |
| 80 g | 14.4 tbsp |
| 90 g | 16.2 tbsp |
| 100 g | 18 tbsp |
Tablespoons to grams table
Working the other way round, here is what each spoonful of rolled oats weighs. One tablespoon is one sixteenth of a cup, so every figure below is the cup weight of 89 g divided by 16. Sixteen tablespoons make one cup, which is why the last row of the table matches the cup weight exactly.
| Tablespoons | Grams |
|---|---|
| 1 tablespoon | 5.6 g |
| 2 tablespoons | 11.1 g |
| 3 tablespoons | 16.7 g |
| 4 tablespoons | 22.2 g |
| 5 tablespoons | 27.8 g |
| 6 tablespoons | 33.4 g |
| 7 tablespoons | 38.9 g |
| 8 tablespoons | 44.5 g |
| 9 tablespoons | 50.1 g |
| 10 tablespoons | 55.6 g |
| 16 tablespoons | 89 g |
Cups to grams for reference
Most recipes switch between cups and tablespoons, so here is the same ingredient measured in cups. Use this table when a recipe gives a cup amount and you want to weigh it, or when you have already measured in tablespoons and want to check the total.
| Cups | Tablespoons | Grams |
|---|---|---|
| 1/4 cup | 4 tablespoons | 22.2 g |
| 1/3 cup | 5 tablespoons plus 1 teaspoon | 29.7 g |
| 1/2 cup | 8 tablespoons | 44.5 g |
| 2/3 cup | 10 tablespoons plus 2 teaspoons | 59.3 g |
| 3/4 cup | 12 tablespoons | 66.8 g |
| 1 cup | 16 tablespoons | 89 g |
| 1 1/2 cups | 24 tablespoons | 133.5 g |
| 2 cups | 32 tablespoons | 178 g |
Worked examples
Porridge for two in the morning
Porridge for two people often starts with half a cup of rolled oats, which is 44.5 g, or 8 tablespoons at 5.6 g each. Half a cup is a generous serving for two bowls, and weighing the 44.5 g keeps the porridge the same thickness every morning instead of thick one day and thin the next. Cook it slowly with about twice its weight in milk or water, stir often so it does not catch on the bottom, and serve with fruit or honey while it is still steaming.
A single portion of 100 g
A single portion of rolled oats is often 100 g dry — about 18 tablespoons — which cooks into a generous side dish for one person or a light main with vegetables. Weigh the dry grains, rinse them if the recipe calls for it, and cook them in the amount of liquid the packet or recipe specifies, because the liquid ratio matters more than the cooking time. Let the pot rest for five minutes after cooking with the lid on, so the grains finish steaming and separate instead of clumping.
Coating chicken for a family dinner
Coating four chicken breasts needs about 4 tablespoons of rolled oats, roughly 22.2 g, seasoned with salt, pepper and herbs. Four tablespoons is enough to coat the chicken evenly without leaving a thick layer that falls off in the pan, and weighing it keeps the coating consistent from piece to piece. Press the coating on firmly, let the chicken rest for five minutes before cooking so the coating sets, and cook until the crust is golden and crisp.
How the figure is measured
Rolled Oats is measured spooned and levelled: spoon it loosely into the tablespoon, then sweep the top flat with the back of a knife. Do not scoop directly from the bag or jar, because scooping packs the ingredient down and a scooped spoon can weigh far more than a spooned one. The spoon-and-level method is the one the source data assumes, so it is the method that makes the numbers on this page true.
The cup weight of 89 g comes from King Arthur Baking. The tablespoon figure is that cup weight divided by 16, rounded to one decimal place, which is why the table is consistent from one row to the next. All results are approximate: brand, grind, humidity and temperature all move the real weight a little, so when a recipe has to work the first time, weigh the ingredient on a kitchen scale and use these numbers as a guide.
Scaling the recipe up and down
Tablespoons scale cleanly once you know the weight of one spoon. A recipe that calls for 8 tablespoons of rolled oats needs 44.5 g, and doubling it to 16 tablespoons means 89 g, exactly one cup. Halving works the same way: 4 tablespoons is 22.2 g, and 2 tablespoons is 11.1 g. The rule that matters is to scale every ingredient by the same factor, because changing one ingredient without changing the others throws the recipe out of balance.
When a recipe gives a weight instead of spoonfuls, work backwards: 100 g of rolled oats is about 18 tablespoons, and 50 g is about 9 tablespoons. Round to the nearest half tablespoon when you are measuring by hand, and accept that the result will be a gram or two off, which is fine for most cooking. For large amounts, stop counting spoons and switch to a cup measure or a scale: counting out 16 tablespoons is slow and error-prone, and a cup is faster and more accurate.
If you do not have a scale
If you do not own a kitchen scale, the tables on this page are your best substitute — but they only work if the spoon is filled the right way. Use a proper set of measuring spoons, fill the tablespoon spooned and levelled, and level it off with the back of a knife. Do not use a tablespoon from the cutlery drawer, do not heap the spoon, and do not scoop straight from the bag, because each of those habits adds an unpredictable amount. For a single tablespoon the error is small in absolute terms but large as a percentage, so for baking and for any recipe you plan to repeat, a basic digital scale is worth the small cost: it turns every conversion on this page from an approximation into a certainty.
Frequently asked questions
How many tablespoons is 100 g of rolled oats?
About 18 tablespoons. The calculation is 100 g divided by 5.6 g per tablespoon, which gives 18. In practice, measure that many level tablespoons and accept that the result will be a gram or two off, or weigh the ingredient directly if the recipe needs to be exact.
How many grams is 1 tablespoon of rolled oats?
One tablespoon of rolled oats weighs 5.6 g, approximately. The figure comes from dividing the cup weight of 89 g by 16, since one tablespoon is one sixteenth of a cup. One teaspoon is 1.9 g, and one cup is 89 g.
How many tablespoons of rolled oats are in a cup?
There are 16 tablespoons in one US cup, so one cup of rolled oats is 16 tablespoons and weighs 89 g. Half a cup is 8 tablespoons (44.5 g), a quarter cup is 4 tablespoons (22.2 g), and three quarters of a cup is 12 tablespoons (66.8 g).
Is 5.6 g per tablespoon exact or approximate?
It is approximate. The cup weight of 89 g comes from King Arthur Baking, measured spooned and levelled, and the real weight of a tablespoon varies with brand, grind, humidity and how the spoon is filled. For most cooking the approximation is fine, and for baking or any recipe that has to work the first time, verify with a kitchen scale.
How much cooked rolled oats does 100 g dry make?
It depends on the grain and how much liquid it absorbs, but dry grains roughly double or triple in weight as they cook, so 100 g dry becomes a generous side dish for two to four people. The exact amount varies with the cooking method and how long the grains simmer, so treat the cooked amount as a guide and the dry weight as the number to measure. Weigh the dry grains before cooking, not after.
How should I store rolled oats?
Airtight container, cool and dry, up to 6 months. Grains keep best sealed and cool, because air and moisture encourage staleness and, in warm kitchens, pantry moths. A sealed jar or container keeps them fresh for months, and buying in bulk only saves money if the container is airtight.
Common mistakes to avoid
- Measuring grains in a heaped cup, which can add a quarter cup or more to a recipe that was developed with a level one.
- Scooping directly from the bag, which packs the grains down and makes a spoonful weigh far more than a spooned one.
- Leaving the spoon heaped instead of levelling it, which adds an unpredictable extra amount every time.
- Guessing the liquid ratio instead of measuring it, which matters more than the grain weight once the pot is on the heat.
The thread running through all of these is the same: grains are a bulk ingredient, and small errors in measuring them become large errors in the finished dish. Measure rolled oats spooned and levelled, level it off, and check the weight on a scale when the recipe has to be right, and the numbers on this page will serve you well.