There are about 6.3 grams in a tablespoon of ground flaxseed, measured level. King Arthur Baking lists 1/2 cup of flax meal at 50 g, so a full cup comes to about 100 g, and that's the figure the chart below is built on.
| Amount | Grams |
|---|---|
| 1/4 tsp | 0.5 g |
| 1/2 tsp | 1.0 g |
| 1 tsp | 2.1 g |
| 1 tbsp | 6.3 g |
| 2 tbsp | 12.5 g |
| 1/4 cup | 25 g |
| 1/2 cup | 50 g |
| 1 cup | 100 g |
Ground flaxseed is light and fluffy, which is exactly why it's easy to get wrong with a spoon. A loose scoop and a pressed scoop can look almost the same and weigh quite differently.
Why ground flax is so easy to over or under measure
Flax meal behaves more like flour than like a seed. A few things move the number:
- Packing. Pressing the spoon into the bag compacts the meal. A packed tablespoon can easily weigh more than 6.3 g.
- Level vs heaped. Fine powders mound up high, so a heaped tablespoon of flax meal can carry a lot of extra weight.
- Grind. Store bought meal is usually fine and even. Flax you grind at home in a coffee or spice grinder can be coarser or fluffier, which changes how much fits in a spoon.
- Whole vs ground. This is the big one. King Arthur Baking lists 1/4 cup of whole flaxseed at 35 g, which works out to about 8.8 g per tablespoon. Whole seeds pack tighter than the airy meal, so a tablespoon of whole flax weighs noticeably more.
Measuring ground flaxseed by weight
Here's the useful part: grinding doesn't change weight, only volume. So if a recipe calls for 2 tablespoons of ground flax, you can weigh out 12.5 g of whole seeds and grind exactly that. No leftover meal, no guessing how much whole flax turns into a tablespoon of ground.
- Set your container on the scale and press tare.
- Add whole seeds or meal until you reach the weight you need, such as 6.3 g for 1 tbsp.
- If you're grinding, grind that weighed amount and use all of it.
- Write the gram amount on your recipe so next time is even faster.
If you want more background on why grams beat spoons for baking, our guide on measuring ingredients by weight for baking consistency walks through it.
Making a flax egg by weight
One of the most common reasons people look this up is the flax egg. Bob's Red Mill's egg replacer uses 1 tablespoon of flaxseed meal plus 3 tablespoons of water for each egg, left to rest for about 5 minutes until it turns thick and gel like.
In grams, that's about 6.3 g of flax meal and about 44 g of water, since a US tablespoon is 14.79 ml and water weighs about 1 g per ml. For a recipe that needs two eggs, double it to 12.5 g of flax meal and about 89 g of water.
Weighing helps here because a heaped spoon of flax with the same water makes a thicker gel, and a skimpy spoon makes a thinner one. Same weight, same gel, every time.
Flax meal also shows up in muffins, pancakes, granola and smoothies. In those, it's less fussy, but a consistent weight keeps the texture from drifting batch to batch.
Common mistakes with flaxseed
- Using whole flax when the recipe says ground. Whole seeds weigh more per spoon and don't gel the same way.
- Scooping straight from a packed bag. Stir or fluff the meal first, or skip volume and weigh it.
- Measuring the water loosely for a flax egg. The water matters as much as the flax. Weigh both.
- Mixing up flax meal and chia. They're used for similar jobs, but they don't weigh the same per tablespoon.
A practical tip: for a flax egg, a MeasureMate digital measuring spoon lets you scoop the meal and weigh it in one step, reading in 0.1 g steps. Tip it into your bowl, then put the bowl on a regular scale for the water.
Quick questions
How many grams of flaxseed are in 2 tablespoons?
About 12.5 g of ground flaxseed. Two tablespoons of whole flaxseed weigh more, about 17.5 g.
How much ground flax and water make one flax egg?
Bob's Red Mill uses 1 tablespoon of flaxseed meal (about 6.3 g) with 3 tablespoons of water (about 44 g), rested for about 5 minutes.
Does grinding flaxseed change its weight?
No. Grinding changes the volume, not the weight, so weigh whole seeds first if you plan to grind them.
Weights based on the King Arthur Baking ingredient weight chart, Bob's Red Mill's flaxseed meal egg replacer and NIST volume conversions.