Millilitres of whole flaxseed to grams runs on one number, 0.69741422 grams per millilitre. It is a measured property of this ingredient rather than a defined conversion, which is why a generic volume-to-weight tool cannot give you it.
Put next to water — 1 g per mL exactly — whole flaxseed measures 0.69741 g per mL. That ratio, 69.74%, is what separates this page from every other ingredient in the same units, and it is measured rather than defined.
Whole flaxseed has a density of 0.69741 g per mL, so 100 mL of it weighs 69.74 g and 250 mL weighs 174.4 g. That single figure is what every other number on this page is built from — water is 1.00 g per mL, so this ingredient is 69.74% as heavy as the same volume of water.
Grams are the unit this conversion is really for. A domestic scale resolves to a gram, which is 0.606% of a cup of whole flaxseed, so weighing gets an accuracy no measuring cup can reach. A 500 g pack of it is 3.03 cups, and a 1 kg pack 6.061.
What the number depends on: Whole seeds. Ground flax is much lighter per cup and goes rancid far faster.
The formula
millilitres- The amount of whole flaxseed you are converting, in millilitres
0.697414218226- Grams per millilitre for whole flaxseed, from its density of 0.69741 g/mL
grams- The equivalent quantity in grams
How it works, step by step
- Enter the quantity in millilitres.
- It is multiplied by 0.697414218226, the grams-per-millilitre figure for whole flaxseed.
- The result appears in grams, with a second reading in oz beneath it.
- Use the measure table if you want a standard recipe quantity rather than a number you type in.
Worked examples
15 mL of whole flaxseed in grams
A recipe calling for 15 mL of whole flaxseed needs 10.4612 grams on the scale. The arithmetic is 15 × 0.69741422 = 10.461213, and halving the recipe halves the weight to 5.23061 grams.
100 mL of whole flaxseed in grams
A recipe calling for 100 mL of whole flaxseed needs 69.7414 grams on the scale. The arithmetic is 100 × 0.69741422 = 69.741422, and halving the recipe halves the weight to 34.8707 grams.
250 mL of whole flaxseed in grams
250 mL of whole flaxseed weighs out at 174.354 grams. Divide 174.354 by 0.69741422 and you get back to 250 mL, which is the quickest check that the factor is the right way up.
How to read your score
Frequently asked questions
How many grams are in 1 mL of whole flaxseed?
One millilitre of whole flaxseed is 0.69741422 grams. Half that quantity is 0.348707 grams and double it is 1.39483 grams, so the figure scales straight up and down — there is no offset in this conversion, only the factor.
Why is a cup of whole flaxseed not 236 g like water?
Because weight per cup depends on what is in the cup. Whole flaxseed has a density of 0.69741 g per mL where water has 1.00, so a cup of it weighs 165 g rather than 236.6 g. That is a difference of 71.6 g per cup, and it is the reason a single volume-to-weight factor cannot be applied to every ingredient.
Does how I measure it change the weight?
Yes, and by more than most people expect. Handling changes the weight of a cup of whole flaxseed by roughly 12% — about 9.9 g either side of 165 g — because whole seeds. Weighing removes the question entirely.
Is a fluid ounce of whole flaxseed the same as an ounce?
No. A fluid ounce is a volume — one eighth of a US cup, 29.57 mL — and an ounce is a weight. One fluid ounce of whole flaxseed weighs 0.7275 oz, so the two readings differ by 27.2%. They coincide only for something with the density of water, and then only roughly.
Is this a US cup or a metric cup?
US customary: 236.59 mL, which is the cup every US recipe means. A metric cup is 250 mL, so the same cup of whole flaxseed would weigh 174.35 g instead of 165 g — 9.35 g more, or 5.67%. Australian and some European recipes use the metric cup, and the difference is large enough to matter in baking.
Do I need a scale for this, or will measuring cups do?
At this size the spoon wins. One millilitre of whole flaxseed is 0.6974 g, and a scale reading to the nearest gram is working at 143% resolution on that — a measuring spoon is the more accurate instrument below about 5 g, which is why spice quantities are still written in spoons.
How many millilitres of whole flaxseed is 500 g?
500 g of whole flaxseed is 716.93 millilitres — 1.43387 millilitres to one gram, so 500 × 1.43387 = 716.93. Going that way is a division by 0.697414, or a multiplication by 1.43387 if you prefer.
Whole flaxseed in millilitres and grams
| Millilitres | Grams | Unrounded |
|---|---|---|
| 5 mL | 3.48707 g | 3.487071091 |
| 10 mL | 6.97414 g | 6.974142182 |
| 15 mL | 10.4612 g | 10.46121327 |
| 30 mL | 20.9224 g | 20.92242655 |
| 50 mL | 34.8707 g | 34.87071091 |
| 100 mL | 69.7414 g | 69.74142182 |
| 125 mL | 87.1768 g | 87.17677728 |
| 150 mL | 104.612 g | 104.6121327 |
| 200 mL | 139.483 g | 139.4828436 |
| 250 mL | 174.354 g | 174.3535546 |
| 500 mL | 348.707 g | 348.7071091 |
Based on 165 g per cup of whole flaxseed. One millilitre of whole flaxseed is 0.69741422 grams.
| Measure | Grams | Ounces | Millilitres |
|---|---|---|---|
| 1 cup | 165 g | 5.82 oz | 236.6 mL |
| 3/4 cup | 123.8 g | 4.37 oz | 177.4 mL |
| 2/3 cup | 110 g | 3.88 oz | 157.7 mL |
| 1/2 cup | 82.5 g | 2.91 oz | 118.3 mL |
| 1/3 cup | 55 g | 1.94 oz | 78.86 mL |
| 1/4 cup | 41.25 g | 1.46 oz | 59.15 mL |
| 1 tbsp | 10.31 g | 0.364 oz | 14.79 mL |
| 1 tsp | 3.438 g | 0.121 oz | 4.929 mL |
US customary measures: 1 cup = 236.59 mL, 1 tbsp = 14.79 mL, 1 tsp = 4.93 mL.
| Ingredient | Grams per cup | Ounces per cup | Density (g/mL) |
|---|---|---|---|
| Blueberries | 148 g | 5.221 oz | 0.6256 |
| Crumbled feta | 150 g | 5.291 oz | 0.634 |
| Corn kernels | 150 g | 5.291 oz | 0.634 |
| Whole flaxseed (this page) | 165 g | 5.82 oz | 0.6974 |
| Sliced strawberries | 166 g | 5.855 oz | 0.7016 |
| Chocolate chips | 170 g | 5.997 oz | 0.7185 |
| Chia seeds | 192 g | 6.773 oz | 0.8115 |
Ordered by weight. The spread across this group is why a single generic cups-to-grams factor cannot work.