US Fluid Dram (fl dr)
One eighth of a US fluid ounce (3.6967 mL). Used in old pharmacy measures.
1 US fluid dram = 0.003696691195 liters (approximately).
About the US fluid dram
Drachma, the Greek coin and weight, lies behind the dram. The Attic drachma weighed about 4.37 g and the Roman one about 3.41 g, and the apothecaries borrowed the name for both a weight and a liquid measure. The US fluid dram is one eighth of a US fluid ounce, 3.6966911953125 mL, and it divides into 60 minims. Its British imperial counterpart, spelled drachm in pharmacy usage from around 1900, is smaller at 3.5516 mL.
Doctors once used the dram as the size of a teaspoonful, and early nineteenth-century prescriptions assumed a teaspoon held 60 minims. By 1876 household teaspoons had grown to 80 to 85 minims, which made that shortcut unreliable for medicine. Pharmacy is now metric, but the fluid dram survives in the capacity of pill bottles and vials. In casual speech a dram of whisky is a small pour, about 25 mL in an English pub and 35 mL in Scotland, which is a different thing from the pharmacist's unit.
Sources: Wikipedia: Fluid dram; Wikipedia: Minim (unit)
US Fluid Dram conversion chart
1 US fluid dram expressed in every other volume unit:
| Unit | 1 US fluid dram |
|---|---|
| Liters | 0.003696691195 |
| Milliliters | 3.696691195 |
| US Gallons | 0.0009765625 |
| US Cups | 0.015625 |
| US Fluid Ounces | 0.125 |
| Cubic Meters | 0.000003696691195 |
| Cubic Centimeters | 3.696691195 |
| US Quarts | 0.00390625 |
| US Pints | 0.0078125 |
| US Tablespoons | 0.25 |
| US Teaspoons | 0.75 |
| Metric Cups | 0.01478676478 |
| Metric Tablespoons | 0.2464460797 |
| Metric Teaspoons | 0.7393382391 |
| Imperial Gallons | 0.0008131583834 |
| Imperial Pints | 0.006505267067 |
| Imperial Fluid Ounces | 0.1301053413 |
| Cubic Inches | 0.2255859375 |
| Cubic Feet | 0.0001305474175 |
| Cubic Yards | 0.000004835089538 |
| Oil Barrels | 0.0000232514881 |
| Cubic Millimeters | 3,696.691195 |
| Microliters | 3,696.691195 |
| Centiliters | 0.3696691195 |
| Deciliters | 0.03696691195 |
| Hectoliters | 0.00003696691195 |
| Cubic Kilometers | 3.696691195×10⁻¹⁵ |
| Australian Tablespoons | 0.1848345598 |
| US Legal Cups | 0.01540287998 |
| Imperial Quarts | 0.003252633534 |
| Cubic Miles | 8.868833823×10⁻¹⁶ |
| Wine Bottles | 0.004928921594 |
| Magnums | 0.002464460797 |
| Jeroboams | 0.001232230398 |
| Methuselahs | 0.0006161151992 |
| Nebuchadnezzars | 0.0002464460797 |
| US Gills | 0.03125 |
| US Minims | 60 |
| Jiggers | 0.08333333333 |
| Pinches | 12 |
| Dashes | 6 |
| Imperial Gills | 0.02602106827 |
| US Bushels | 0.0001049031991 |
| US Pecks | 0.0004196127966 |
| US Dry Quarts | 0.003356902373 |
| US Dry Pints | 0.006713804745 |
| US Dry Barrels | 0.00003197079613 |
| US Liquid Barrels | 0.00003100198413 |
| UK Beer Barrels | 0.00002258773287 |
| Firkins | 0.00009035093149 |
| Kilderkins | 0.00004517546575 |
| Hogsheads (ale) | 0.00001505848858 |
| Tierces | 0.0000232514881 |
| Hogsheads (wine) | 0.00001550099206 |
| Puncheons | 0.00001162574405 |
| Butts (pipe) | 0.000007750496032 |
| Tuns | 0.000003875248016 |
| Acre-feet | 2.996956325×10⁻⁹ |
| Cords | 0.000001019901699 |
| Board Feet | 0.00156656901 |
| Cyathi | 0.08127076826 |
| Sextarii | 0.006772564022 |
| Congii | 0.00112876067 |
| Modii | 0.0004232852514 |
| Amphorae | 0.0001410950838 |
| Omers | 0.00168031418 |
| Hin | 0.001008188508 |
| Baths (biblical) | 0.000168031418 |
| Homers | 0.0000168031418 |
| Gō | 0.02049269463 |
| Shō | 0.002049269463 |
| Tō | 0.0002049269463 |
| Koku | 0.00002049269463 |
| Charkas | 0.03005584166 |
| Shtofs | 0.003005584166 |
| Vedros | 0.0003005584166 |
More US customary units
- US gallon (volume)
- US quart (volume)
- US pint (volume)
- US cup (volume)
- US fluid ounce (volume)
- US tablespoon (volume)
- US teaspoon (volume)
- US gill (volume)
- US minim (volume)
- US legal cup (volume)
- US bushel (volume)
- US peck (volume)
- US dry quart (volume)
- US dry pint (volume)
- US dry barrel (volume)
- oil barrel (volume)
Browse all volume units.