One teaspoon of rye flour is 2.125 grams, so converting teaspoons of rye flour to grams means multiplying by 2.125. That factor is specific to this ingredient — it comes from its density, not from any relationship between the two units.
Water is the yardstick: 1 mL of it weighs 1 g. Rye flour comes in at 0.43113 g per mL, or 43.11% of water, which is why a cup of it is 102 g rather than 236.6 g. Volume and weight only line up for water, and only in metric.
A level teaspoon of rye flour weighs 2.125 g. A kitchen scale that reads to the nearest gram is therefore working at roughly 47.1% resolution on a single spoonful, which is why measuring spoons beat scales below about 5 g and lose to them above it. Three teaspoons make a tablespoon, so the same spoonful is 6.375 g if the recipe scales up.
Grams are the unit this conversion is really for. A domestic scale resolves to a gram, which is 0.98% of a cup of rye flour, so weighing gets an accuracy no measuring cup can reach. A 500 g pack of it is 4.902 cups, and a 1 kg pack 9.804.
How the figure is arrived at: One of the lightest flours per cup. Rye has little gluten to develop, so it is almost always blended with wheat flour.
The formula
teaspoons- The amount of rye flour you are converting, in teaspoons
2.125- Grams per teaspoon for rye flour, from its density of 0.43113 g/mL
grams- The equivalent quantity in grams
How it works, step by step
- Enter the quantity in teaspoons.
- It is multiplied by 2.125, the grams-per-teaspoon figure for rye flour.
- 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
3/4 tsp of rye flour in grams
A recipe calling for 3/4 tsp of rye flour needs 1.59375 grams on the scale. The arithmetic is 0.75 × 2.125 = 1.59375, and halving the recipe halves the weight to 0.796875 grams.
1 1/2 tsp of rye flour in grams
Take 1 1/2 tsp of rye flour: 1.5 × 2.125 gives 3.1875 grams. Doubling the batch takes it to 6.375 grams, because the relationship is a straight proportion once the density is known.
4 tsp of rye flour in grams
Take 4 tsp of rye flour: 4 × 2.125 gives 8.5 grams. Doubling the batch takes it to 17 grams, because the relationship is a straight proportion once the density is known.
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Frequently asked questions
How many grams are in 1 tsp of rye flour?
One teaspoon of rye flour is 2.125 grams. Half that quantity is 1.0625 grams and double it is 4.25 grams, so the figure scales straight up and down — there is no offset in this conversion, only the factor.
Why is a cup of rye flour not 236 g like water?
Because weight per cup depends on what is in the cup. Rye flour has a density of 0.43113 g per mL where water has 1.00, so a cup of it weighs 102 g rather than 236.6 g. That is a difference of 134.6 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 rye flour by roughly 20% — about 10.2 g either side of 102 g — because one of the lightest flours per cup. Weighing removes the question entirely.
Is a fluid ounce of rye flour 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 rye flour weighs 0.4497 oz, so the two readings differ by 55%. 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 rye flour would weigh 107.78 g instead of 102 g — 5.78 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 teaspoon of rye flour is 2.125 g, and a scale reading to the nearest gram is working at 47.1% 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 teaspoons of rye flour is 500 g?
500 g of rye flour is 235.29 teaspoons — 0.470588 teaspoons to one gram, so 500 × 0.470588 = 235.29. Going that way is a division by 2.125, or a multiplication by 0.470588 if you prefer.
Rye flour in teaspoons and grams
| Teaspoons | Grams | Unrounded |
|---|---|---|
| 1/4 tsp | 0.53125 g | 0.53125 |
| 1/2 tsp | 1.0625 g | 1.0625 |
| 3/4 tsp | 1.59375 g | 1.59375 |
| 1 tsp | 2.125 g | 2.125 |
| 1 1/2 tsp | 3.1875 g | 3.1875 |
| 2 tsp | 4.25 g | 4.25 |
| 3 tsp | 6.375 g | 6.375 |
| 4 tsp | 8.5 g | 8.5 |
| 6 tsp | 12.75 g | 12.75 |
Based on 102 g per cup of rye flour. One teaspoon of rye flour is 2.125 grams.
| Measure | Grams | Ounces | Millilitres |
|---|---|---|---|
| 1 cup | 102 g | 3.6 oz | 236.6 mL |
| 1 tbsp | 6.375 g | 0.225 oz | 14.79 mL |
| 2 tsp | 4.25 g | 0.15 oz | 9.858 mL |
| 1 tsp | 2.125 g | 0.075 oz | 4.929 mL |
| 3/4 tsp | 1.594 g | 0.0562 oz | 3.697 mL |
| 1/2 tsp | 1.062 g | 0.0375 oz | 2.464 mL |
| 1/4 tsp | 0.5312 g | 0.0187 oz | 1.232 mL |
| 1/8 tsp | 0.2656 g | 0.00937 oz | 0.6161 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) |
|---|---|---|---|
| Rolled oats | 90 g | 3.175 oz | 0.3804 |
| Oat flour | 92 g | 3.245 oz | 0.3889 |
| Almond flour | 96 g | 3.386 oz | 0.4058 |
| Rye flour (this page) | 102 g | 3.598 oz | 0.4311 |
| Dry breadcrumbs | 108 g | 3.81 oz | 0.4565 |
| Coconut flour | 112 g | 3.951 oz | 0.4734 |
| Cake flour | 114 g | 4.021 oz | 0.4818 |
Ordered by weight. The spread across this group is why a single generic cups-to-grams factor cannot work.