1/2 Cup Sunflower Seeds in Grams
1/2 cup of sunflower seeds weighs 70 g (spooned and levelled, King Arthur Baking). Hulled sunflower seeds, mild and nutty. All the figures on this page are approximate conversions based on the King Arthur Baking value, so when a recipe really matters, verify with a kitchen scale. Sunflower seeds are the seed that fills a loaf, a granola batch or a salad with crunch for very little money, which is why a half cup of them is the amount a single bake usually needs, and why the weight matters more than the volume when the seeds are doing structural work.
Why half a cup of sunflower seeds is a useful amount
Half a cup of sunflower seeds is the amount that goes into a loaf of bread, a batch of granola or a jar of overnight oats, and it is an amount where the cup can quietly mislead you. Small seeds settle and pack, so a half cup that was spooned in gently weighs less than one that was scooped from a settled bag, and a few grams either way changes the texture of a bake. Bread, granola, salads and snacking. The table below is built from the published King Arthur Baking weight for sunflower seeds measured spooned and levelled, so you can weigh a batch once and repeat it exactly.
Sunflower Seeds cups to grams conversion table
| Cups | Grams | Tablespoons (approx.) |
|---|---|---|
| 1/4 cup | 35 g | 2.2 g |
| 1/3 cup | 46.7 g | 2.9 g |
| 1/2 cup | 70 g | 4.4 g |
| 2/3 cup | 93.3 g | 5.8 g |
| 3/4 cup | 105 g | 6.6 g |
| 1 cup | 140 g | 8.8 g |
| 1 1/2 cups | 210 g | 13.1 g |
| 2 cups | 280 g | 17.5 g |
| 3 cups | 420 g | 26.2 g |
| 4 cups | 560 g | 35 g |
The tablespoon column is a bonus for recipes that call for a spoonful or two: one tablespoon of sunflower seeds weighs about 8.8 g, and one teaspoon about 2.9 g. A cup is 16 tablespoons, so the numbers in the table are just the cup weight divided by 16, rounded to one decimal place. For small amounts a scale that reads to the gram is far more reliable than a spoon, because a heaped tablespoon can weigh half as much again as a level one.
How the weight was measured
Spooned and levelled means spooning the ingredient into the measuring cup until it is heaped, then sweeping a straight knife across the top to level it off. Never scoop the cup through the bag or jar, and never tap the cup down, because both pack the ingredient and add weight.
The source for the 140 g figure is King Arthur Baking, and the confidence in the value is high. King Arthur Baking publishes a standard ingredient weight chart that recipe developers use as a reference, and this page follows it exactly rather than averaging across sources, because an average of two different measuring methods is a number that matches nobody's cup.
Worked examples
A seeded loaf for the week
A seeded loaf for the week calls for 1/2 cup of sunflower seeds, which is 70 g, folded into the dough before the final rise. The seeds absorb water from the dough, so their weight decides whether the crumb stays moist or dries out. Weighing 70 g keeps the loaf even, and the seeds should be soaked for an hour first, or they steal moisture from the crumb as the loaf bakes.
A tray of granola for breakfasts
A tray of granola for the week uses 1/2 cup of sunflower seeds, which is 70 g, tossed with oats, honey and oil. The seeds toast faster than the oats, so they go in halfway through baking to avoid burning. Weighing 70 g keeps the granola crunchy without being mostly seeds, and the tray must cool completely before it is jarred, or the granola goes soft.
A salad topping for a buffet
A salad for a buffet uses 1/2 cup of toasted sunflower seeds, which is 70 g, scattered over the finished bowls. The seeds are the crunch in a soft salad, so their weight decides whether every serving gets some. Weighing 70 g keeps the topping even, and the seeds should be toasted in a dry pan and cooled before they go on, or they soften in the dressing.
When this conversion matters most
This conversion matters most when seeds are doing structural work. In bread, the weight of sunflower seeds decides how much water the dough needs and how the crumb holds together; in granola, it decides the ratio of crunch to oats; in a pudding or a gel, it decides whether the mixture sets or stays runny. A cup measure hides all of that behind how settled the seeds are in the bag, so two cooks following the same recipe with cups can end up with different results. Weighing removes the guesswork and tells you exactly how much of an ingredient a recipe really needs.
Common mistakes with sunflower seeds
- Scooping from a settled bag. Seeds settle in storage, so a scooped half cup from the bottom of the bag weighs more than a spooned one from the top. Stir or shake the bag first, then spoon and level.
- Measuring seeds wet. Some seeds absorb water fast, so a half cup measured after soaking weighs far more than a dry one. Always weigh seeds dry unless the recipe says otherwise.
- Eyeballing a small amount. A tablespoon of small seeds looks like almost nothing, which tempts cooks to add a generous extra spoonful. Weigh it: the difference between 10 g and 15 g of seeds is visible in the finished dish.
- Storing seeds in a warm cupboard. Seeds go rancid in warmth and light, and stale seeds weigh the same but taste flat. Keep them sealed and cool so the weight you measure is the flavour you expect.
Storage and handling
Airtight container, cool and dry, up to 6 months. Keeping sunflower seeds stored properly also keeps its weight per cup stable: an ingredient that has absorbed moisture from the air weighs more per cup than a dry one, so a sealed container is not just about freshness, it is about measurement accuracy too. If a bag has been open for months in a humid kitchen, the first thing to do before a precise bake is to weigh the ingredient rather than trusting the cup.
Frequently asked questions
How many grams is 1/2 cup of sunflower seeds?
1/2 cup of sunflower seeds weighs 70 g, measured spooned and levelled according to King Arthur Baking. That is the figure to use when converting a recipe from cups to grams, and it is the value the conversion table on this page is built on.
How do I measure sunflower seeds without a scale?
Spooned and levelled means spooning the ingredient into the measuring cup until it is heaped, then sweeping a straight knife across the top to level it off. Never scoop the cup through the bag or jar, and never tap the cup down, because both pack the ingredient and add weight. That gives the closest result to 70 g per half cup, but it is still an estimate: the honest answer is that a scale is the only way to know the exact weight, and a basic digital kitchen scale costs less than a bag of good flour.
Does sunflower seeds always weigh the same per cup?
No. Brand, grind, moisture and how settled the container is all shift the weight by a few grams, and for some ingredients the swing can be much larger. The 140 g figure is the standard King Arthur Baking value for sunflower seeds measured spooned and levelled, and it is the right default, but when a recipe is precise, weigh the ingredient and trust the scale over the cup.
Can I use the same conversion for a different brand of sunflower seeds?
Yes, as a starting point. The 140 g figure is a standard average for sunflower seeds, and most brands sit within a few grams of it. If you cook with one brand all the time, weigh one cup of it once and note the number on the bag, and you will have a conversion tuned to your own kitchen.
Do sunflower seeds need to be soaked before baking with them?
For bread, yes, usually. Dry sunflower seeds absorb water from the dough as it rises and bakes, which can leave the crumb dry and the seeds hard. Soaking the weighed 70 g in warm water for an hour before mixing solves it. For granola or a salad topping, skip the soak: the seeds are meant to stay crunchy, and the honey or dressing gives them all the moisture they need.
How should I store sunflower seeds?
Airtight container, cool and dry, up to 6 months. Good storage keeps the ingredient fresh and keeps its weight per cup consistent, because moisture absorbed from the air adds grams that the recipe did not ask for.
Related conversions
Use the cups to grams converter, tablespoons to grams converter, weight converter, recipe scaler for instant answers, or browse the cups to grams hub for the full ingredient list. Related pages: Rolled Oats in cups to grams, Quinoa in cups to grams, Almond Flour in cups to grams. See also our disclaimer about approximate conversions.