Understanding US Fluid Drams to Imperial Fluid Ounces Conversion
The US fluid dram is the US fluid dram, a US customary liquid unit equal to 1/8 of a US fluid ounce, or about 3.6967 millilitres, historically used by apothecaries for small liquid doses. The Imperial Fluid Ounce is the Imperial fluid ounce, a British customary unit of 28.4130625 millilitres. Converting US Fluid Drams to Imperial Fluid Ounces is useful for UK and Commonwealth recipes, bar measures, and older British formulations, where a US apothecary dram must be expressed in the target measure.
Conversion Formula
To convert US Fluid Drams to Imperial Fluid Ounces, multiply by this factor:
Step-by-Step Example
Convert 25 US Fluid Drams to Imperial Fluid Ounces.
How to Convert US Fluid Drams to Imperial Fluid Ounces
Use the fixed factor between the US fluid dram and the Imperial Fluid Ounce to convert any quantity.
- Start with your value: Note the number of US Fluid Drams you want to convert.
- Apply the factor: Multiply that number by 0.130105, the Imperial Fluid Ounces in one US fluid dram.
- Read the result: The product is your volume in Imperial Fluid Ounces.
- Worked result: For 25 US Fluid Drams, Imperial Fluid Ounces.
US Fluid Drams to Imperial Fluid Ounces conversion table
| US Fluid Drams (fl-dr) | Imperial Fluid Ounces (imp-fl-oz) |
|---|---|
| 0 | 0 |
| 1 | 0.1301053 |
| 2 | 0.2602107 |
| 3 | 0.390316 |
| 4 | 0.5204214 |
| 5 | 0.6505267 |
| 6 | 0.780632 |
| 7 | 0.9107374 |
| 8 | 1.040843 |
| 9 | 1.170948 |
| 10 | 1.301053 |
| 15 | 1.95158 |
| 20 | 2.602107 |
| 25 | 3.252634 |
| 30 | 3.90316 |
| 40 | 5.204214 |
| 50 | 6.505267 |
| 60 | 7.80632 |
| 70 | 9.107374 |
| 80 | 10.40843 |
| 90 | 11.70948 |
| 100 | 13.01053 |
| 150 | 19.5158 |
| 200 | 26.02107 |
| 250 | 32.52634 |
| 300 | 39.0316 |
| 400 | 52.04214 |
| 500 | 65.05267 |
| 600 | 78.0632 |
| 700 | 91.07374 |
| 800 | 104.0843 |
| 900 | 117.0948 |
| 1000 | 130.1053 |
| 2000 | 260.2107 |
| 3000 | 390.316 |
| 4000 | 520.4214 |
| 5000 | 650.5267 |
| 10000 | 1301.053 |
| 25000 | 3252.634 |
| 50000 | 6505.267 |
| 100000 | 13010.53 |
| 250000 | 32526.34 |
| 500000 | 65052.67 |
| 1000000 | 130105.3 |
Which fluid ounce do you mean?
“fluid ounce” means different units by region. This page uses the Imperial fluid ounce (UK). 1 US Fluid Drams in each:
| Definition | Result |
|---|---|
| US fluid ounce 29.57 mL | 0.125 fl-oz |
| Imperial fluid ounce (UK) 28.41 mL | 0.1301053 imp-fl-oz (this page) |
What is the US Fluid Dram?
The US fluid dram (also spelled fluid drachm) is a small United States customary unit of liquid volume, historically important in pharmacy and medicine for dispensing doses of liquid medication.
Definition
The US fluid dram is defined as one eighth of a US fluid ounce, or equivalently 60 minims.
Since the US fluid ounce is exactly 29.5735295625 mL, a fluid dram equals 3.6966912 mL. The UK/imperial fluid drachm is slightly larger at about 3.5516 mL (1/8 of the imperial fluid ounce).
Origin and History
"Dram" derives from the Greek drachma, an ancient coin and weight. The apothecaries' system split the fluid ounce into 8 fluid drams and each dram into 60 minims, giving pharmacists a fine graduation for compounding and measuring liquid remedies.
Law and Notable Facts
The fluid dram is a legal US customary unit but is now largely obsolete in clinical practice, superseded by milliliters. Its legacy survives in the term "dram" for a small pour of whisky and in the traditional 8-dram, 1-fluid-ounce medicine bottle.
Real-World Examples and Conversions
- A single US fluid dram is about 3.70 mL, roughly three-quarters of a metric teaspoon.
- 8 US fluid drams equal 1 US fluid ounce (29.5735 mL).
- 1 US fluid dram = 60 minims ≈ 0.75 teaspoon; 1 mL ≈ 0.2705 US fluid dram.
What is the Imperial Fluid Ounce?
The imperial fluid ounce is a unit of volume in the British imperial system, used chiefly in the United Kingdom and Commonwealth countries for measuring liquids. It is slightly smaller than the US fluid ounce.
Definition
The imperial fluid ounce is defined as one one-hundred-sixtieth of an imperial gallon.
Since the imperial gallon is exactly 4.54609 litres, the imperial fluid ounce is exactly mL. There are 20 imperial fluid ounces in an imperial pint and 160 in an imperial gallon.
Origin and History
The fluid ounce descends from the medieval practice of relating volume to the weight of a substance—historically, one fluid ounce of water was intended to weigh about one avoirdupois ounce. The British imperial system was standardized by the Weights and Measures Act of 1824, which fixed the gallon as the volume occupied by 10 pounds of distilled water. The imperial gallon was later redefined in metric terms as exactly 4.54609 litres in 1985.
Law and Notable Facts
The imperial fluid ounce remains a legally recognized unit in the UK, though most packaged goods are now labeled in millilitres. Notably, the imperial fluid ounce (28.413 mL) is about 4% smaller than the US customary fluid ounce (29.574 mL), so an imperial pint (568 mL, 20 fl oz) is noticeably larger than a US pint (473 mL, 16 fl oz)—a frequent source of confusion for travelers.
Real-World Examples and Conversions
- A traditional British pint of beer is 20 imperial fluid ounces, or about 568 mL.
- A 5 imperial-fluid-ounce cup of tea equals roughly 142 mL.
- 10 imperial fluid ounces is exactly half an imperial pint, about 284 mL.
- Converting a US recipe: 8 US fluid ounces (236.6 mL) equals about 8.33 imperial fluid ounces.
Frequently Asked Questions
How many Imperial Fluid Ounces are in one US fluid dram?
One US fluid dram equals 0.130105 Imperial Fluid Ounces, since a US fluid dram is about 3.6967 millilitres.
How do I convert US Fluid Drams to Imperial Fluid Ounces?
Multiply the number of US Fluid Drams by 0.130105 to get the equivalent value in Imperial Fluid Ounces.
How many US Fluid Drams make up one Imperial Fluid Ounce?
It takes about 7.68608 US Fluid Drams to fill one Imperial Fluid Ounce.
Where is this US Fluid Dram to Imperial Fluid Ounce conversion used?
It is handy for UK and Commonwealth recipes, bar measures, and older British formulations, where an old US apothecary dram needs restating.
Is the US fluid dram the same as the fluid ounce?
No. A US fluid dram is exactly one-eighth of a US fluid ounce, so eight drams make a single US fluid ounce.