Convert Drop to Imperial Gallon
Convert drops to imperial gallons instantly. 1 drop = 1.099846e-5 imperial gallon — use the live calculator, the exact formula, a conversion table and worked examples. Also check the Imperial Gallon to Drop converter for the reverse conversion.
Units explained
Drop
A drop is a nominal small volume of about 0.05 mL; the exact size varies with the liquid and dropper.
Standardized loosely in pharmacy as roughly 1/20 of a milliliter (the metric drop).
Used for liquid medication and flavor dosing; treat as approximate.
Pharmacy convention.
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.
Drop to Imperial Gallon conversion formula
Note: this conversion uses a generally accepted modern value. Historical and regional definitions of this unit varied across times and places.
The relationship between drops and imperial gallons:
To convert drops to imperial gallons, multiply the value in drops by 1.099846e-5. To reverse, multiply imperial gallons by 90921.8.
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 Drop converter for the reverse direction.
Step-by-step: convert drops to imperial gallons
- Write down the value in drops (gtt).
- Multiply that value by the factor 1.099846e-5.
- The product is the equivalent value in imperial gallons (gal).
- To reverse, multiply the imperial gallon value by 90921.8.
Worked examples
Example 1 — Convert 1 gtt to gal:
1 × 1.099846e-5 = 1.099846e-5 gal
Example 2 — Convert 100 gtt to gal:
100 × 1.099846e-5 = 0.0010998462 gal
Real-world example — Sub-micron to millimeter
500,000 drops converts to a small everyday quantity in imperial gallons — useful when relating optical-wavelength specifications to physical mounting hardware.
500000 gtt × 1.099846e-5 = 5.4992312075 gal
Real-world example — From wavelengths to millimeter-scale objects
A value of one million drops sounds vast at the atomic scale but converts to a small everyday quantity in imperial gallons — useful when relating optical-wavelength specifications to physical mounting hardware.
1000000 gtt × 1.099846e-5 = 10.998462415 gal
Drop to Imperial Gallon conversion table
Standard reference values for converting drops to imperial gallons:
| Drop [gtt] | Imperial Gallon [gal] |
|---|---|
| 0.01 | 1.099846e-7 |
| 0.1 | 1.099846e-6 |
| 1 | 1.099846e-5 |
| 2 | 2.199692e-5 |
| 3 | 3.299539e-5 |
| 4 | 4.399385e-5 |
| 5 | 5.499231e-5 |
| 10 | 0.0001099846 |
| 20 | 0.0002199692 |
| 30 | 0.0003299539 |
| 40 | 0.0004399385 |
| 50 | 0.0005499231 |
| 100 | 0.0010998462 |
| 500 | 0.0054992312 |
| 1000 | 0.0109984624 |
Frequently asked questions
How many imperial gallons is 1 drop?
How do I convert drops to imperial gallons?
How do I convert imperial gallons back to drops?
How many imperial gallons is 100 drops?
Popular volume unit conversions
Convert Drop to other volume units
Show all Drop conversions
Metric / SI (3 units)
US Customary (Liquid) (1 units)
Imperial (UK) (1 units)
Cubic (length-derived) (1 units)
Sources & references
Conversion factor (1 gtt = 1.099846e-5 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.