100 g of peanuts is 0.70 cups. That is the short answer: one US cup of peanuts weighs 142 g (spooned and levelled, King Arthur Baking), so 100 g ÷ 142 g per cup = 0.70 cups. Every figure on this page is approximate — peanuts is a natural product, and the way it is measured moves the weight of a cup by a few grams — so when the recipe matters, verify with a kitchen scale. For everyday cooking, 0.70 cups is the number to use.
This page is the reverse of the usual conversion: most recipes list peanuts in cups and the cook wants grams, but here the recipe, the packet or the scale gives grams and the cook has only cup measures. That happens more often than people expect — imported recipes, nutrition labels, bulk packs and meal-prep plans all speak in grams, while American cup measures are what is actually in the drawer. The conversion is one division, 100 ÷ 142 = 0.70, and the table below runs the same division for the amounts that come up most often.
100 grams of peanuts in cups — conversion table
| Grams | Cups (approx.) |
|---|---|
| 25 g | 0.18 cups |
| 50 g | 0.35 (1/3 cups) |
| 75 g | 0.53 cups |
| 100 g | 0.70 cups |
| 125 g | 0.88 (7/8 cups) |
| 150 g | 1.06 cups |
| 200 g | 1.41 cups |
| 250 g | 1.76 cups |
| 300 g | 2.11 cups |
| 400 g | 2.82 cups |
| 500 g | 3.52 cups |
Read the table from left to right: find the grams you have, and the cups column tells you how much that is, approximately. A quarter of a cup is 36 g, half a cup is 71 g, and three quarters is 106 g. For amounts between the rows, divide the grams by 142: for example, 36 g is 0.25 cups, and 106 g is 0.75 cups. The same 142 g figure works in the other direction too — multiply cups by 142 to get grams — and the second table runs that calculation for the common cup fractions.
| Cups | Grams (approx.) |
|---|---|
| 1/4 cup | 36 g |
| 1/3 cup | 47 g |
| 1/2 cup | 71 g |
| 2/3 cup | 95 g |
| 3/4 cup | 106 g |
| 1 cup | 142 g |
| 1 1/2 cups | 213 g |
| 2 cups | 284 g |
How the 142 g cup is measured
The 142 g figure only holds when peanuts is measured the way King Arthur Baking measured it: spooned and levelled. Shelled whole peanuts, and it is used for Snacking, stir-fries, sauces and baking That matters because the measuring method is part of the number. A cup that is scooped straight from the container packs the ingredient in and weighs more than a cup that is spooned in and levelled, and for a light or powdery ingredient the gap can be 20 to 30 percent — enough to change a recipe outright.
That is why the headline number on this page is labelled approximate. King Arthur Baking publishes the figure as a standard, and it is the best single number available, but your peanuts, your cup and your technique will all nudge it a gram or two in either direction. When the dish is forgiving — baking and seasoning — that nudge does not matter. When it is a cake, a custard or a batch of dough, weigh the peanuts on a kitchen scale and let the grams decide. The cup figure is a convenience for the everyday cook, not a laboratory standard, and treating it that way keeps both the recipe and the cook honest.
Worked examples with peanuts
A spice rub or seasoning blend
A small amount must be measured accurately is a good place to start. 75 g of peanuts is 0.53 cups, because 75 divided by 142 is 0.53. In practice that means a recipe calling for 0.53 cups can be weighed out as 75 g and tipped straight into a mixing bowl, with no jug to wash. The habit to build is converting once, writing the cup figure on the recipe, and then cooking from the cups — the scale only comes out for the first batch, and after that the converted recipe is a cup recipe. If the amount is awkward, round to the nearest tablespoon: one tablespoon of peanuts weighs about 8.9 g, so a couple of spoonfuls either way covers most rounding gaps without anyone noticing in the finished dish.
A baking recipe written in grams
Scaling a recipe is where grams-to-cups conversion earns its keep. 200 g of peanuts is 1.41 cups, because 200 divided by 142 is 1.41. A cook who weighs the ingredient once and writes the cup figure on the recipe card never has to do the division again, and the second time the dish is made it is a cup recipe from the start. The trap is scaling the cups by eye instead: doubling a rounded cup figure doubles the rounding error too, so always scale from the grams, then convert the total, and only then round to a measuring cup that exists in the drawer.
A bulk batch, halved or doubled
The third scenario is the one that catches beginners out. 350 g of peanuts is 2.46 cups, because 350 divided by 142 is 2.46. That looks like a lot of peanuts in a bowl, and it is — but the division does not care how big the number looks, and neither does the recipe. The practical move is to weigh the full amount on the scale, then measure it out in cupfuls into a mixing bowl, counting as you go, so the scale confirms the cups rather than the other way round. If the last cupful is a partial one, the table above tells you exactly how partial it should be.
Practical guidance: getting peanuts right
The most common mistake with peanuts is measuring by the wrong method. Peanuts is measured spooned and levelled by King Arthur Baking, and any other approach changes the weight of the cup. Scooping packs it down, tapping the cup settles it, and heaping it over the rim adds a spoonful that the recipe never asked for. Spoon it in, level it with the back of a knife, and read a liquid at eye level in a jug on a flat surface.
The second mistake is treating all cups as equal. A US cup is 236.6 ml, a metric cup is 250 ml, and an old imperial cup is different again, so a recipe that says "1 cup" without saying which cup is already ambiguous before any conversion begins. This page uses US cups throughout, and the 142 g figure belongs to a US cup of peanuts. If the recipe came from a metric country, check whether its cups are metric before converting, or better still, cook from the grams and skip cups entirely.
Storage matters too, because stale peanuts measures differently from fresh: Airtight container, cool and dry, up to 3 months A jar that has sat open absorbs moisture or dries out, and either way the cup weight drifts from the standard. Keep the container sealed, keep it in the place the packet suggests, and replace it when it is past its best, since no conversion can fix an ingredient that has gone off.
When you have no scale at all, the cups on this page are your fallback, and they are a good one for everyday cooking. Weigh once when you can, note the cup figure that matched, and build a small personal conversion list on the inside of a cupboard door. Over a few months that list becomes more accurate for your kitchen than any published table, because it reflects your cups, your brands and your hands.
Frequently asked questions
Is 100 g of peanuts exactly 0.70 cups?
Approximately, yes, and the word approximately matters. The division is exact — 100 ÷ 142 = 0.70 — but the 142 g per cup figure is itself a standard average from King Arthur Baking, measured spooned and levelled. A different brand, a different grind or a different measuring technique can shift a cup by a few grams, so 0.70 cups is the right working figure, and a kitchen scale is the right check when the recipe is delicate.
How do I measure 100 g of peanuts without a scale?
Measure 0.70 cups spooned and levelled, using a proper dry measuring cup for a dry ingredient or a liquid jug for a pourable one, and level the top with a straight edge. Do not scoop from the bag or pack the cup down unless the method says packed, because that adds weight and throws the conversion off. If you only have tablespoons, one tablespoon of peanuts weighs about 8.9 g, so roughly 11 level tablespoons make 100 g — a useful fallback, though a scale is still more accurate.
Can I use the same conversion for a different brand of peanuts?
Yes, as a starting point. The 142 g per cup figure from King Arthur Baking is a standard for peanuts in general, and most brands land within a few grams of it. The exception is a product whose texture is very different from the standard — a coarse grind, a low-fat version or a whipped one — where the cup weight can move further. If a brand behaves oddly in a recipe, weigh it once, note the result on the packet, and use your own figure from then on.
Why do different websites give different cups for 100 g of peanuts?
Because they start from different cup weights. Some sites use a rounded 8-ounce cup, some use a scooped cup, and some use a different source entirely, and each choice changes the divisor in the same division. This page uses 142 g per cup (spooned and levelled, King Arthur Baking) consistently, so every number here agrees with every other number here. When you compare sources, compare the cup weight they assume, not just the final answer.
Does humidity change how much 100 g of peanuts fills a cup?
Yes, a little. Dry powders and ground spices absorb moisture from damp air and settle more tightly, so a cup can weigh slightly more on a humid day than on a dry one, and a cup that has sat in the jar can compact under its own weight. Stir or fluff the ingredient before measuring, spoon it into the cup, and level it off — that keeps the conversion close to the 142 g standard this page uses.
How many grams is half a cup of peanuts?
Half a cup is about 71 g, because half of 142 is 71.0. A quarter cup is about 36 g and three quarters is about 106 g. These are the figures most cooks actually reach for, since recipes rarely call for a full cup of peanuts at a time, and they all come from the same 142 g per cup standard.