How many cups in a kilogram of peanut butter? About 3.7. The arithmetic is simple — a kilogram is 1,000 g, one cup of peanut butter weighs 270 g scooped, and 1,000 / 270 = 3.7 — but a cup is a volume measure and peanut butter is not perfectly uniform, so treat the result as approximate and weigh it when the recipe depends on it. A kilogram of peanut butter is a familiar tub size — the catering tub or the bulk jar — and the cup question comes up the moment you start baking with it. Peanut butter is dense and heavy for its volume compared with flour or oats, so a kilogram gives only about 3.7 cups, and whether it is smooth or crunchy changes the count slightly, because the peanut pieces in crunchy butter leave small air pockets. This page uses the scooped figure from the source table, which is the way peanut butter is normally measured.

That 3.7-cup figure is the one to remember, and it is worth knowing what sits behind it. Peanut Butter is used for sandwiches, cookies, sauces and satay, and in all of those jobs the recipe usually talks in cups while the shop sells by the kilogram. Ground peanuts, usually with salt and a little oil. The source for the cup weight is King Arthur Baking, with high confidence in the figure, and the method is scooped — press the butter into the cup with the back of a spoon so no air pockets remain, then level it off. If you spoon it in loosely and leave air gaps, the same cup weighs less than 270 g, and your 3.7-cup kilogram quietly becomes more cups than you counted on.

The conversion table

All figures below are computed from the same cup weight — one cup of peanut butter is 270 g scooped — so the table is internally consistent. Grams are rounded to the nearest gram and cups to one decimal place; both are approximate.

Amount Cups Grams
100 g 0.4 cups 100 g
250 g (quarter kilogram) 0.9 cups 250 g
500 g (half kilogram) 1.9 cups 500 g
750 g 2.8 cups 750 g
1 kg 3.7 cups 1000 g
1.5 kg 5.6 cups 1500 g
2 kg 7.4 cups 2000 g
5 kg 18.5 cups 5000 g
Cups Grams
1/4 cups 68 g
1/2 cups 135 g
3/4 cups 202 g
1 cup 270 g
1.5 cups 405 g
2 cups 540 g
3 cups 810 g
4 cups 1080 g
5 cups 1350 g
8 cups 2160 g
10 cups 2700 g

A kilogram is also 2.20462 pounds, and a pound of peanut butter is about 1.7 cups (454 g divided by 270 g per cup), so the kilogram figure of 3.7 cups is a little more than twice the pound figure. A tablespoon of peanut butter weighs about 16.9 g and a teaspoon about 5.6 g, which is useful when a recipe calls for a spoonful rather than a cupful — though for spoon measures the scale is still the safer tool when the amount is small and the recipe is sensitive.

Worked example 1: buying a kilogram bag

Suppose you buy a 1 kg tub of peanut butter for a large batch of peanut butter cookies. The bag holds about 3.7 cups, and if each batch needs 2 cups — 540 g — the bag covers about 1.9 batches. In practice you will lose a little to spillage and to the last spoonfuls that cling to the bag, so plan on 2 full batches and treat the remainder as a bonus. This is the calculation that tells you whether the bulk bag is actually a bargain: divide the price of the bag by 1.9 and you have the cost per batch, which you can compare honestly with the smaller bag on the shelf.

Worked example 2: a recipe written in cups

Now take the recipe the other way round. You are making a double batch of banana bread and the recipe calls for 1 cup of peanut butter. That is 270 g, so if your scale reads in grams you can weigh it directly and skip the cup entirely. If you are doubling the recipe, you need 2 cups, which is 540 g; tripled, it is 3 cups or 810 g. And if you only have the kilogram bag and no smaller measure, remember that 1 cup is about 27.0 percent of the bag — a useful sense-check when you are pouring from a large bag into a bowl and wondering whether you have taken too much.

Worked example 3: using up a half kilogram

A half kilogram — 500 g — of peanut butter is about 1.9 cups. If you are a week's worth of granola, and each serving or batch takes 3 cups (810 g), a half-kilogram pack gives you about 0.6 of them. A quarter kilogram, 250 g, is about 0.9 cups, and 100 g — the smallest pack size you will commonly see — is about 0.4 cups. Working from the bag downwards like this stops the most common bulk-buy mistake: opening a kilogram bag for a recipe that needs a quarter of it, and then storing the rest badly because there was no plan for it.

Method and source

The cup weight used on this page is 270 g per cup, measured scooped, from King Arthur Baking. Confidence is rated high: the figure comes from a published ingredient weight chart and is widely used by bakers. The method matters as much as the number. Peanut butter is measured scooped: press it into the cup with the back of a spoon so no air pockets remain, then level the top with a knife. A loosely spooned cup with air gaps weighs less than the 270 g figure, which is why the source specifies scooped. Smooth and crunchy butter differ slightly — crunchy weighs a touch less per cup because of the air around the pieces — but the difference is small. Every cup result on this page is therefore labelled approximate, and the honest advice is to verify with a kitchen scale whenever the recipe matters — a scale that reads grams costs little and removes the whole problem.

Practical guidance

Peanut butter keeps well, but its oils can turn rancid once a tub is opened, so a kilogram tub is a race against time in a warm kitchen. Keep it sealed in a cool cupboard, stir natural peanut butter before use because the oil separates on standing, and refrigerate it if your kitchen is hot. Taste a spoonful before you bake with it: a bitter, paint-like flavour means the oils have turned, and no recipe can rescue it.

Storage for a kilogram of peanut butter deserves a sentence of its own: Cool cupboard; stir natural peanut butter before use. A kilogram is a lot to store badly, so decant it into a sealed container as soon as the bag is opened, label it with the date, and keep the container where you will actually see it — ingredients hidden at the back of a cupboard are the ones that go stale unnoticed. If you buy in bulk to save money, the saving only survives if the second half of the bag is as fresh as the first when you reach it.

The most common mistake with kilogram-to-cup conversions is treating the cup as if it were a weight. It is not: a cup of water weighs 237 g, a cup of flour weighs 120 g, and a cup of shredded coconut weighs 85 g, all in the same cup. The cup measures volume, the kilogram measures weight, and the ingredient's density is the only bridge between them. That is why this site gives a different cup figure for every ingredient, and why a conversion you memorised for one ingredient will be wrong for the next. Keep the scale on the bench, use the cup figures as a planning tool, and weigh the ingredient when the recipe's success depends on the amount.

Frequently asked questions

How many cups are in 1 kg of peanut butter?

There are about 3.7 cups in a kilogram of peanut butter. One cup weighs about 270 g scooped, so 1,000 g divided by 270 g gives 3.7 cups. The figure is approximate: how you fill the cup changes the weight, so verify with a kitchen scale when it matters.

How many grams is 1 cup of peanut butter?

One cup of peanut butter weighs about 270 g, measured scooped, according to King Arthur Baking (high confidence). A tablespoon is about 16.9 g and a teaspoon about 5.6 g.

How many cups are in 500 g of peanut butter?

There are about 1.9 cups in 500 g of peanut butter — half the kilogram figure, since 500 g is half a kilogram. A quarter kilogram (250 g) is about 0.9 cups, and 100 g is about 0.4 cups.

Does smooth or crunchy peanut butter change how many cups are in a kilogram?

Slightly. The figure here — about 3.7 cups per kilogram — is for peanut butter measured scooped, and smooth butter packs a little tighter than crunchy, whose peanut pieces leave small air pockets. The difference is only a few grams per cup, so the same figure works for both in practice. What matters more is the method: press the butter into the cup so no air pockets remain, level it, and weigh it when the recipe depends on the amount.

How should I store a kilogram of peanut butter?

Cool cupboard; stir natural peanut butter before use. Keep the bulk of the bag sealed and decant a working amount into a smaller jar, so the main supply is opened as rarely as possible.

Is the cup figure exact, or should I weigh it?

It is approximate. The cup weight of 270 g is a published average for peanut butter scooped, and real cups vary with brand, grind, humidity and how you fill the cup. For everyday cooking the cup figure is fine; for baking, for costing a recipe, or for any recipe where the amount is critical, weigh the ingredient on a kitchen scale and use the cup figure only to plan.

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