Convert Imperial Fluid Drachm to Imperial Gallon
Convert imperial fluid drachms to imperial gallons instantly. 1 imperial fluid drachm = 0.00078125 imperial gallon — use the live calculator, the exact formula, a conversion table and worked examples. Also check the Imperial Gallon to Imperial Fluid Drachm converter for the reverse conversion.
Units explained
Imperial Fluid Drachm
An imperial fluid drachm is 1/8 of an imperial fluid ounce (3.5516 mL).
The British apothecaries' subdivision of the fluid ounce.
Historical pharmacy unit.
UK apothecaries' system.
Imperial Gallon
The imperial gallon is defined as exactly 4.54609 liters.
Set by the British Weights and Measures Act of 1824 as the volume of 10 lb of water.
Used for fuel and beverages in the UK and Commonwealth.
UK, 1824.
Imperial Fluid Drachm to Imperial Gallon conversion formula
The relationship between imperial fluid drachms and imperial gallons:
To convert imperial fluid drachms to imperial gallons, multiply the value in imperial fluid drachms by 0.00078125. To reverse, multiply imperial gallons by 1280.
How to use this converter
Type a value into the calculator. The result in imperial gallons updates as you type. Tap a quick value, copy the result with one click, or use the swap arrow to jump straight to the Imperial Gallon to Imperial Fluid Drachm converter for the reverse direction.
Step-by-step: convert imperial fluid drachms to imperial gallons
- Write down the value in imperial fluid drachms (fl dr).
- Multiply that value by the factor 0.00078125.
- The product is the equivalent value in imperial gallons (gal).
- To reverse, multiply the imperial gallon value by 1280.
Worked examples
Example 1 — Convert 1 fl dr to gal:
1 × 0.00078125 = 0.00078125 gal
Example 2 — Convert 100 fl dr to gal:
100 × 0.00078125 = 0.078125 gal
Real-world example — Packaging gauge
A 4-imperial fluid drachm plastic bag thickness is a common spec for grocery and freezer bags. Converting from imperial fluid drachms to imperial gallons is what packaging buyers do whenever they bridge US and metric supplier quotes.
4 fl dr × 0.00078125 = 0.003125 gal
Real-world example — Plastic film and laminate thickness
A 500-imperial fluid drachm sheet is a typical spec for ID-card laminates and film overlays. Converting to imperial gallons aligns the value with the unit most CAD systems and material datasheets prefer.
500 fl dr × 0.00078125 = 0.390625 gal
Imperial Fluid Drachm to Imperial Gallon conversion table
Standard reference values for converting imperial fluid drachms to imperial gallons:
| Imperial Fluid Drachm [fl dr] | Imperial Gallon [gal] |
|---|---|
| 0.01 | 7.8125e-6 |
| 0.1 | 7.8125e-5 |
| 1 | 0.00078125 |
| 2 | 0.0015625 |
| 3 | 0.00234375 |
| 4 | 0.003125 |
| 5 | 0.00390625 |
| 10 | 0.0078125 |
| 20 | 0.015625 |
| 30 | 0.0234375 |
| 40 | 0.03125 |
| 50 | 0.0390625 |
| 100 | 0.078125 |
| 500 | 0.390625 |
| 1000 | 0.78125 |
Frequently asked questions
How many imperial gallons is 1 imperial fluid drachm?
How do I convert imperial fluid drachms to imperial gallons?
How do I convert imperial gallons back to imperial fluid drachms?
How many imperial gallons is 100 imperial fluid drachms?
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Metric / SI (3 units)
US Customary (Liquid) (1 units)
Imperial (UK) (1 units)
Cubic (length-derived) (1 units)
Sources & references
Conversion factor (1 fl dr = 0.00078125 gal) verified against the following authoritative sources:
- BIPM — The International System of Units (SI Brochure 9th ed.)
Official BIPM publication defining the seven SI base units (including the meter) and the rules for their use. The global authority on units of measurement.
- NIST — Guide to the SI
US National Institute of Standards and Technology reference covering the SI base and derived units with definitions and usage rules for US technical practice.
- NIST Special Publication 811 — Guide for the Use of the International System of Units
Detailed NIST guide covering exact conversion factors between SI and US customary units along with formatting and rounding conventions.
- NIST — Refinement of values for the yard and pound (Federal Register 1959)
The treaty (signed by US
- International Astronomical Union — System of Astronomical Constants
The IAU defines astronomical units including the AU (149597870700 m exactly) light-year and parsec used in astronomy and astrophysics.