Mass per volume density.
Ounces per Tablespoon to Drams per Cup Converter — oz/tbsp to dr/cup
Convert Ounce per Tablespoon (oz/tbsp) to Dram per Cup (dr/cup) using the exact conversion factor (1 ounce per tablespoon = 256 dram per cup). See the formula, worked examples, and conversion table.
Ounces per Tablespoon to Drams per Cup converter
Converter
Density Converter
Convert thousands of mass-per-volume density combinations for science, engineering, agriculture, and fluids.
Context values
Some unit families need one extra value for a physically accurate result.
Mass per volume density.
Result = input x 1917.222837 / 7.489151707.
Density uses kilograms per cubic meter as the base unit.
Reserved above the conversion cards and below the converter.
About Converting Ounces per Tablespoon to Drams per Cup
Ounce per Tablespoon and Dram per Cup both measure density — mass per unit volume — a property used to identify materials, check manufacturing quality, and predict whether something floats or sinks. As a fixed reference point, water has a density of exactly 1000 kg/m³ (1 g/cm³, 1 g/mL) at its temperature of maximum density, which is why many density figures in science and engineering are quoted relative to water. Both are mass per volume density units.
Formula
drams per cup = ounces per tablespoon × 256
This factor comes from each unit's defined relationship to the category's base unit: 1 ounce per tablespoon equals 1917.22283707 base units, and 1 dram per cup equals 7.48915170731 base units, so dividing one by the other gives the direct ounce per tablespoon-to-dram per cup factor of 256.
Simple example
1 oz/tbsp × 256 = 256 dr/cup
1 ounce per tablespoon = 256 drams per cup.
Real-world example
1,000 oz/tbsp × 256 = 256,000 dr/cup
1,000 ounces per tablespoon = 256,000 drams per cup.
Conversion table
| Ounce per Tablespoon (oz/tbsp) | Dram per Cup (dr/cup) |
|---|---|
| 0.1 oz/tbsp | 25.6 dr/cup |
| 1 oz/tbsp | 256 dr/cup |
| 10 oz/tbsp | 2,560 dr/cup |
| 100 oz/tbsp | 25,600 dr/cup |
| 1,000 oz/tbsp | 256,000 dr/cup |
| 10,000 oz/tbsp | 2,560,000 dr/cup |
Reverse conversion: Dram per Cup to Ounce per Tablespoon
256 dr/cup × 0.00390625 = 1 oz/tbsp
256 drams per cup = 1 ounce per tablespoon.
ounces per tablespoon = drams per cup × 0.00390625
For a page dedicated to this direction, see Dram per Cup to Ounce per Tablespoon.
Understanding the Ounce per Tablespoon (oz/tbsp)
Mass per volume density.
Understanding the Dram per Cup (dr/cup)
Mass per volume density.
Reserved between the cards and the FAQ so the page stays balanced.
Frequently asked questions
How many drams per cup are in 1 ounce per tablespoon?
1 ounce per tablespoon equals 256 drams per cup, using the exact defined conversion factor rather than an estimate.
How do I convert ounce per tablespoon to dram per cup?
Multiply the ounce per tablespoon value by 256. The converter above does this instantly to whatever precision you set.
How do I convert dram per cup back to ounce per tablespoon?
Use the reverse factor: 1 dram per cup equals 0.00390625 ounces per tablespoon. You can also use the swap control in the converter above to flip the direction instantly.
What is a ounce per tablespoon?
Ounce per Tablespoon (oz/tbsp) is a unit of density.
What is a dram per cup?
Dram per Cup (dr/cup) is a unit of density.
Is the ounce per tablespoon to dram per cup conversion exact?
Yes. Both ounce per tablespoon and dram per cup are defined by fixed standards rather than physical artifacts, so the factor of 256 used above is exact to as many digits as you choose to display.
What's the difference between density and mass concentration?
Density is the mass of a pure substance or material per unit volume. Mass concentration is the mass of one component — like a dissolved solute — within a mixture's total volume. The two use the same kind of units but describe different physical situations.