Convert Imperial Gallon to Milliliter
Convert imperial gallons to milliliters instantly. 1 imperial gallon = 4546.09 milliliter — use the live calculator, the exact formula, a conversion table and worked examples. Also check the Milliliter 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.
Milliliter
A milliliter is one thousandth of a liter, exactly equal to one cubic centimeter.
Formed with the SI prefix milli- applied to the liter.
The standard small-volume unit in cooking, medicine and the laboratory.
Metric prefix system.
Imperial Gallon to Milliliter conversion formula
The relationship between imperial gallons and milliliters:
To convert imperial gallons to milliliters, multiply the value in imperial gallons by 4546.09. To reverse, multiply milliliters by 0.0002199692.
How to use this converter
Type a value into the calculator. The result in milliliters updates as you type. Tap a quick value, copy the result with one click, or use the swap arrow to jump straight to the Milliliter to Imperial Gallon converter for the reverse direction.
Step-by-step: convert imperial gallons to milliliters
- Write down the value in imperial gallons (gal).
- Multiply that value by the factor 4546.09.
- The product is the equivalent value in milliliters (mL).
- To reverse, multiply the milliliter value by 0.0002199692.
Worked examples
Example 1 — Convert 1 gal to mL:
1 × 4546.09 = 4546.09 mL
Example 2 — Convert 100 gal to mL:
100 × 4546.09 = 454609 mL
Real-world example — Adjacent metric sub-units
One imperial gallon equals 1,000 milliliters. Engineers move between these scales constantly: PCB feature sizes in the larger unit, wire-bond diameters in the smaller.
1 gal × 4546.09 = 4546.09 mL
Real-world example — Adjacent small-scale precision
One imperial gallon equals 1,000 milliliters — 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 × 4546.09 = 4546.09 mL
Imperial Gallon to Milliliter conversion table
Standard reference values for converting imperial gallons to milliliters:
| Imperial Gallon [gal] | Milliliter [mL] |
|---|---|
| 0.01 | 45.4609 |
| 0.1 | 454.609 |
| 1 | 4546.09 |
| 2 | 9092.18 |
| 3 | 13638.27 |
| 4 | 18184.36 |
| 5 | 22730.45 |
| 10 | 45460.9 |
| 20 | 90921.8 |
| 30 | 136382.7 |
| 40 | 181843.6 |
| 50 | 227304.5 |
| 100 | 454609 |
| 500 | 2273045 |
| 1000 | 4546090 |
Frequently asked questions
How many milliliters is 1 imperial gallon?
How do I convert imperial gallons to milliliters?
How do I convert milliliters back to imperial gallons?
How many milliliters is 100 imperial gallons?
Popular volume unit conversions
Convert Imperial Gallon to other volume units
Show all Imperial Gallon conversions
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 = 4546.09 mL) 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.