Convert Flax Seeds — Cups, Grams & Ounces
1 cup of flax seeds (also called linseeds) weighs about 150 g. Half a cup is 75 g, a tablespoon about 9.38 g, and a full cup is 5.29 ounces on a scale.
💡 Tip: Whole flax seeds slip through the gut undigested, so you miss most of the omega-3 and fibre. Grind them just before use to actually absorb the benefit.
Converting grams of flax seeds back to cups
| Grams | Amount | Ounces |
|---|---|---|
| 10 | 1 1/8 tbsp | 0.35 |
| 25 | 2 2/3 tbsp | 0.88 |
| 30 | 1/4 cup | 1.06 |
| 50 | 1/3 cup | 1.76 |
| 75 | 1/2 cup | 2.65 |
| 100 | 2/3 cup | 3.53 |
| 125 | 7/8 cup | 4.41 |
| 150 | 1 cup | 5.29 |
| 200 | 1 1/3 cups | 7.05 |
| 250 | 1 2/3 cups | 8.82 |
| 300 | 2 cups | 10.6 |
How many grams in a cup of flax seeds?
| Cups | Grams | Ounces |
|---|---|---|
| 1/8 | 18.8 | 0.66 |
| 1/4 | 37.5 | 1.32 |
| 1/3 | 50 | 1.76 |
| 1/2 | 75 | 2.65 |
| 2/3 | 100 | 3.53 |
| 3/4 | 113 | 3.97 |
| 1 | 150 | 5.29 |
| 1 1/2 | 225 | 7.94 |
| 2 | 300 | 10.6 |
There are 16 tablespoons in a cup, so one tablespoon of flax seeds weighs roughly 9.38 g — and a teaspoon 3.13 g.
Is flax seeds heavy or light for its category?
A cup of flax seeds weighs 150 g, which puts it 11th by weight among the 13 nuts & seeds on this site. Its nearest neighbours are poppy seeds at 145 g and hemp hearts at 160 g per cup.
Swapping these by the cupful is not like-for-like. A cup of hemp hearts in place of flax seeds puts roughly 10 g more in the bowl, so match the grams rather than the cups.
Common questions about measuring flax seeds
- How many cups is 100g of flax seeds?
- 100 g of flax seeds works out at roughly 2/3 cup.
- How many grams is ⅓ cup of flax seeds?
- About 50 g (150 ÷ 3).
- How much is 80g of flax seeds in cups?
- About ½ cup (80 ÷ 150 = 0.53 cup).
- How many grams is ¼ cup of flax seeds?
- About 38 g (150 ÷ 4).
- Are whole and ground flax the same weight per cup?
- No. Whole seeds pack tighter at about 150 g per cup; once ground, flax meal is fluffier at about 112 g per cup.
- How many grams is 1 cup of flax seeds?
- Reckon on 150 grams per US cup of flax seeds — about 5.29 ounces.
- How many cups is 50g of flax seeds?
- Just over or under 1/3 cup, depending how firmly you fill the cup. 50 g ÷ 150 g per cup = 1/3 cup.
- How many grams is a tablespoon of flax seeds?
- About 9.38 g per tablespoon — there are 16 tablespoons in a cup.
- Why do my numbers differ slightly?
- How it is cut changes everything. Whole nuts leave large gaps in a cup, chopped ones pack closer, and ground ones closer still — so a cup of the same nut can swing by a third depending on the knife work.