One gram of whole flaxseed is 1.4338681 millilitres, so converting grams of whole flaxseed to millilitres means multiplying by 1.4338681. That factor is specific to this ingredient — it comes from its density, not from any relationship between the two units.
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
grams- The amount of whole flaxseed you are converting, in grams
1.4338681- Millilitres per gram for whole flaxseed, from its density of 0.69741 g/mL
millilitres- The equivalent quantity in millilitres
How it works, step by step
- Enter the quantity in grams.
- It is multiplied by 1.4338681, the millilitres-per-gram figure for whole flaxseed.
- The result appears in millilitres, with a second reading in tsp beneath it.
- Use the measure table if you want a standard recipe quantity rather than a number you type in.
Worked examples
50 g of whole flaxseed in millilitres
A recipe calling for 50 g of whole flaxseed needs 71.6934 millilitres on the scale. The arithmetic is 50 × 1.4338681 = 71.693405, and halving the recipe halves the weight to 35.8467 millilitres.
150 g of whole flaxseed in millilitres
150 g of whole flaxseed weighs out at 215.08 millilitres. Divide 215.08 by 1.4338681 and you get back to 150 g, which is the quickest check that the factor is the right way up.
500 g of whole flaxseed in millilitres
500 g of whole flaxseed weighs out at 716.934 millilitres. Divide 716.934 by 1.4338681 and you get back to 500 g, which is the quickest check that the factor is the right way up.
How to read your score
Frequently asked questions
How many millilitres are in 1 g of whole flaxseed?
One gram of whole flaxseed is 1.4338681 millilitres. Half that quantity is 0.716934 millilitres and double it is 2.86774 millilitres, 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 much does 15 mL of whole flaxseed weigh?
15 mL of whole flaxseed comes to 10.461 g, or 10.461 grams. This page runs that calculation in reverse — enter a weight and it returns the volume — and the ml-to-grams page does it in the direction the question is usually asked.
Whole flaxseed in grams and millilitres
| Grams | Millilitres | Unrounded |
|---|---|---|
| 5 g | 7.16934 mL | 7.1693405 |
| 10 g | 14.3387 mL | 14.338681 |
| 25 g | 35.8467 mL | 35.8467025 |
| 50 g | 71.6934 mL | 71.693405 |
| 100 g | 143.387 mL | 143.38681 |
| 125 g | 179.234 mL | 179.2335125 |
| 150 g | 215.08 mL | 215.080215 |
| 200 g | 286.774 mL | 286.77362 |
| 250 g | 358.467 mL | 358.467025 |
| 300 g | 430.16 mL | 430.16043 |
| 500 g | 716.934 mL | 716.93405 |
| 1000 g | 1433.87 mL | 1433.8681 |
Based on 165 g per cup of whole flaxseed. One gram of whole flaxseed is 1.4338681 millilitres.
| 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.