Convert Imperial Gallon to US Fluid Dram
Convert imperial gallons to us fluid drams instantly. 1 imperial gallon = 1229.772723717 us fluid dram — use the live calculator, the exact formula, a conversion table and worked examples. Also check the US Fluid Dram to Imperial Gallon converter for the reverse conversion.
Units explained
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.
US Fluid Dram
A US fluid dram is 1/8 of a US fluid ounce (3.6967 mL).
An apothecaries' subdivision of the fluid ounce.
Historical pharmacy unit, now rare.
Apothecaries' system.
Imperial Gallon to US Fluid Dram conversion formula
The relationship between imperial gallons and us fluid drams:
To convert imperial gallons to us fluid drams, multiply the value in imperial gallons by 1229.772723717. To reverse, multiply us fluid drams by 0.0008131584.
How to use this converter
Type a value into the calculator. The result in us fluid drams updates as you type. Tap a quick value, copy the result with one click, or use the swap arrow to jump straight to the US Fluid Dram to Imperial Gallon converter for the reverse direction.
Step-by-step: convert imperial gallons to us fluid drams
- Write down the value in imperial gallons (gal).
- Multiply that value by the factor 1229.772723717.
- The product is the equivalent value in us fluid drams (fl dr).
- To reverse, multiply the us fluid dram value by 0.0008131584.
Worked examples
Example 1 — Convert 1 gal to fl dr:
1 × 1229.772723717 = 1229.772723717 fl dr
Example 2 — Convert 100 gal to fl dr:
100 × 1229.772723717 = 122977.2723716971 fl dr
Real-world example — Adjacent metric sub-units
One imperial gallon equals 1,000 us fluid drams. Engineers move between these scales constantly: PCB feature sizes in the larger unit, wire-bond diameters in the smaller.
1 gal × 1229.772723717 = 1229.772723717 fl dr
Real-world example — Adjacent small-scale precision
One imperial gallon equals 1,000 us fluid drams — the standard sub-millimeter precision conversion that materials engineers use whenever they switch between bulk material thickness specs (larger unit) and surface-finish characteristics (smaller unit).
1 gal × 1229.772723717 = 1229.772723717 fl dr
Imperial Gallon to US Fluid Dram conversion table
Standard reference values for converting imperial gallons to us fluid drams:
| Imperial Gallon [gal] | US Fluid Dram [fl dr] |
|---|---|
| 0.01 | 12.2977272372 |
| 0.1 | 122.9772723717 |
| 1 | 1229.772723717 |
| 2 | 2459.5454474339 |
| 3 | 3689.3181711509 |
| 4 | 4919.0908948679 |
| 5 | 6148.8636185849 |
| 10 | 12297.7272371697 |
| 20 | 24595.4544743394 |
| 30 | 36893.1817115091 |
| 40 | 49190.9089486789 |
| 50 | 61488.6361858486 |
| 100 | 122977.2723716971 |
| 500 | 614886.3618584856 |
| 1000 | 1229772.7237169712 |
Frequently asked questions
How many us fluid drams is 1 imperial gallon?
How do I convert imperial gallons to us fluid drams?
How do I convert us fluid drams back to imperial gallons?
How many us fluid drams is 100 imperial gallons?
Popular volume unit conversions
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Metric / SI (15 units)
US Customary (Liquid) (15 units)
US Customary (Dry) (5 units)
Imperial (UK) (13 units)
Cubic (length-derived) (4 units)
Cooking / Culinary (5 units)
Sources & references
Conversion factor (1 gal = 1229.772723717 fl dr) 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 Hydrographic Organization — Resolution on the Nautical Mile
International authority that standardised the nautical mile at exactly 1852 m in 1929 — the value adopted worldwide for sea and air navigation.