One-Third Cup of Flaxseed (whole) in Grams
1/3 cup of flaxseed (whole) weighs 49.67g (1.75 oz, 80ml) according to USDA FoodData Central (1 cup flaxseed (whole) = 149g, spooned and leveled method). 1/3 cup = 0.3333 of a full cup (240ml). See the full conversion table below for all amounts from 1 tablespoon to 3 cups.
Flaxseed (whole) Cup-to-Gram Conversion Table
Full range from 1 tablespoon to 3 cups. The highlighted row shows 1/3 cup.
| Amount | Grams |
|---|---|
| 1 tbsp | 9.31g |
| 2 tbsp | 18.63g |
| 1/8 cup | 18.63g |
| 1/4 cup | 37.25g |
| 1/3 cupthis page | 49.67g |
| 1/2 cup | 74.5g |
| 2/3 cup | 99.33g |
| 3/4 cup | 111.75g |
| 1 cup | 149g |
| 1 1/4 cups | 186.25g |
| 1 1/2 cups | 223.5g |
| 1 3/4 cups | 260.75g |
| 2 cups | 298g |
| 2 1/2 cups | 372.5g |
| 3 cups | 447g |
Source: USDA FoodData Central (FDC ID: 169414). 1 US cup = 240ml. Values use spooned-and-leveled method.
1/3 Cup of Different Ingredients — Weight Comparison
1/3 cup of different ingredients varies widely in weight because each has a different density. This matters when substituting ingredients in recipes.
| Ingredient | 1/3 Cup (g) |
|---|---|
| Sunflower Seeds (shelled) | 42.67g |
| Pumpkin Seeds (pepitas) | 43g |
| Sesame Seeds | 48g |
| Flaxseed (whole)current | 49.67g |
| Chia Seeds | 53.33g |
| Hemp Seeds (hulled) | 53.33g |
All values use USDA FoodData Central spooned-and-leveled method. Click any ingredient to see its full conversion table.
Measuring Flaxseed (whole) Accurately
Why weight matters: 1/3 cup of flaxseed (whole) can weigh anywhere from 42g to 60g depending on how you measure it. The USDA standard is 49.67g (spooned and leveled). Scooping directly from the container can add 10–20% extra weight, which affects recipe results — especially in baking.
About flaxseed (whole) density: Whole flaxseeds: 1 cup = 149g. Ground flaxseed (flax meal) is lighter: ~130g/cup. Ground flax is more digestible and bioavailable than whole. 1 tablespoon ground flax + 3 tablespoons water = 1 egg substitute (flax egg). USDA FDC 169414.
About 1/3 Cup as a Measurement
1/3 cup = 5 tablespoons + 1 teaspoon = 80ml. This unusual fraction appears in recipes that scale for 2 servings from a 3-serving base. It cannot be made from combining standard 1/4 and 1/8 cup measures without error.
One-third cup is common in yogurt parfait recipes, small-batch granola bars, and single-layer cake recipes scaled for 2 servings. It is exactly 80ml in metric volume.
Frequently Asked Questions
How many grams is 1/3 cup of flaxseed (whole)?
1/3 cup of flaxseed (whole) weighs 49.67 grams (1.75 oz, 80ml). Based on USDA FoodData Central: 1 cup flaxseed (whole) = 149g, so 1/3 cup = 149 × 0.333 = 49.67g.
Is 1/3 cup of flaxseed (whole) the same weight every time?
The weight can vary slightly depending on measuring technique. Spooned and leveled gives 49.67g. Scooped (packed) can be 10–20% heavier. Sifted gives a lighter weight. The USDA standard (spooned and leveled) of 49.67g is the most reliable baseline for recipes.
How do I accurately measure 1/3 cup of flaxseed (whole)?
For accuracy, use a kitchen scale and weigh 49.67g of flaxseed (whole). If using measuring cups, spoon the flaxseed (whole) lightly into a 1/3 Cup measuring cup and level off the top with a straight edge. Avoid scooping directly from the container, which compacts the ingredient and adds extra weight.
How does 1/3 cup of flaxseed (whole) compare to other ingredients?
1/3 cup of different ingredients varies significantly: Sunflower Seeds (shelled) = 42.67g, Pumpkin Seeds (pepitas) = 43g, Sesame Seeds = 48g. This is because each ingredient has a different density.