A kilogram of sunflower seeds holds about 7.1 cups. That is the short answer: one cup weighs about 140 g spooned and levelled, and 1,000 divided by 140 is 7.1. The rest of this page is about using that number properly — when it is reliable, when it drifts, and how a kilogram of sunflower seeds actually behaves in real recipes. Seeds are bought by the kilogram by anyone who bakes bread, makes granola or blends smoothies regularly, and the cup count is the bridge between the bulk bag and the recipe. Seeds are small and dense, so they pack efficiently, and a kilogram goes a long way — a single tablespoon can be all a loaf or a smoothie needs. The figures here are for the seeds as sold, dry and loose.

That 7.1-cup figure is the one to remember, and it is worth knowing what sits behind it. Sunflower Seeds is used for bread, granola, salads and snacking, and in all of those jobs the recipe usually talks in cups while the shop sells by the kilogram. Hulled sunflower seeds, mild and nutty. The source for the cup weight is King Arthur Baking, with high confidence in the figure, and the method is spooned and levelled — spoon the ingredient into the cup and level it off, rather than scooping from the bag, which packs it down and adds weight. If you scoop, the same cup can hold noticeably more, and your 7.1-cup kilogram quietly becomes fewer cups than you counted on.

The conversion table

All figures below are computed from the same cup weight — one cup of sunflower seeds is 140 g spooned and levelled — 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 0.7 cups 100 g
250 g (quarter kilogram) 1.8 cups 250 g
500 g (half kilogram) 3.6 cups 500 g
750 g 5.4 cups 750 g
1 kg 7.1 cups 1000 g
1.5 kg 10.7 cups 1500 g
2 kg 14.3 cups 2000 g
5 kg 35.7 cups 5000 g
Cups Grams
1/4 cups 35 g
1/2 cups 70 g
3/4 cups 105 g
1 cup 140 g
1.5 cups 210 g
2 cups 280 g
3 cups 420 g
4 cups 560 g
5 cups 700 g
8 cups 1120 g
10 cups 1400 g

A kilogram is also 2.20462 pounds, and a pound of sunflower seeds is about 3.2 cups (454 g divided by 140 g per cup), so the kilogram figure of 7.1 cups is a little more than twice the pound figure. A tablespoon of sunflower seeds weighs about 8.8 g and a teaspoon about 2.9 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 bag of sunflower seeds for a month of seeded sandwich loaves. The bag holds about 7.1 cups, and if each batch needs 0.25 cups — 35 g — the bag covers about 28.6 batches. In practice you will lose a little to spillage and to the last spoonfuls that cling to the bag, so plan on 29 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 28.6 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 large batch of granola bars and the recipe calls for 1 cup of sunflower seeds. That is 140 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 280 g; tripled, it is 3 cups or 420 g. And if you only have the kilogram bag and no smaller measure, remember that 1 cup is about 14.0 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 sunflower seeds is about 3.6 cups. If you are a week of breakfast smoothies, and each serving or batch takes 0.125 cups (18 g), a half-kilogram pack gives you about 28.6 of them. A quarter kilogram, 250 g, is about 1.8 cups, and 100 g — the smallest pack size you will commonly see — is about 0.7 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 140 g per cup, measured spooned and levelled, 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. Spooning and levelling means spooning the ingredient into the measuring cup until it is heaped, then sweeping a knife across the top; scooping the cup through the bag compresses the ingredient and can add 10 to 20 percent to the weight. For a poured ingredient the figure is for the ingredient poured into the cup without packing. 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

Keep seeds in an airtight container away from heat and light; their oils are delicate and go stale quietly. A kilogram bag will last months if it is stored well, but buy whole seeds rather than pre-ground where you can, and grind small amounts as you need them. When a recipe calls for seeds by the cup, remember that a level cup is the standard — a heaped cup can add a third again, which matters in bread dough hydration.

Storage for a kilogram of sunflower seeds deserves a sentence of its own: Airtight container, cool and dry, up to 6 months. 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 sunflower seeds?

There are about 7.1 cups in a kilogram of sunflower seeds. One cup weighs about 140 g spooned and levelled, so 1,000 g divided by 140 g gives 7.1 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 sunflower seeds?

One cup of sunflower seeds weighs about 140 g, measured spooned and levelled, according to King Arthur Baking (high confidence). A tablespoon is about 8.8 g and a teaspoon about 2.9 g.

How many cups are in 500 g of sunflower seeds?

There are about 3.6 cups in 500 g of sunflower seeds — half the kilogram figure, since 500 g is half a kilogram. A quarter kilogram (250 g) is about 1.8 cups, and 100 g is about 0.7 cups.

Do seeds absorb liquid and change weight after soaking?

They do take up water — chia seeds are famous for it, forming a gel — but the cup figures on this page are for dry seeds as sold. Weigh seeds dry before soaking, and add the soaking liquid separately in the recipe. If a recipe calls for soaked seeds by the cup, measure them after soaking and draining, and expect the volume to have grown.

How should I store a kilogram of sunflower seeds?

Airtight container, cool and dry, up to 6 months. 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 140 g is a published average for sunflower seeds spooned and levelled, 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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