Convert Cubic Decimeter to Imperial Gallon
Convert cubic decimeters to imperial gallons instantly. 1 cubic decimeter = 0.2199692483 imperial gallon — use the live calculator, the exact formula, a conversion table and worked examples. Also check the Imperial Gallon to Cubic Decimeter converter for the reverse conversion.
Units explained
Cubic Decimeter
A cubic decimeter is the volume of a cube one decimeter on a side, exactly equal to one liter (0.001 m³).
Derived from the decimeter; in 1964 the CGPM defined the liter as exactly one cubic decimeter.
Common in chemistry and engineering as an exact synonym for the liter.
CGPM, 1964.
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.
Cubic Decimeter to Imperial Gallon conversion formula
The relationship between cubic decimeters and imperial gallons:
To convert cubic decimeters to imperial gallons, multiply the value in cubic decimeters by 0.2199692483. To reverse, multiply imperial gallons by 4.54609.
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 Cubic Decimeter converter for the reverse direction.
Step-by-step: convert cubic decimeters to imperial gallons
- Write down the value in cubic decimeters (dm³).
- Multiply that value by the factor 0.2199692483.
- The product is the equivalent value in imperial gallons (gal).
- To reverse, multiply the imperial gallon value by 4.54609.
Worked examples
Example 1 — Convert 1 dm³ to gal:
1 × 0.2199692483 = 0.2199692483 gal
Example 2 — Convert 100 dm³ to gal:
100 × 0.2199692483 = 21.9969248299 gal
Real-world example — Postcard and small-object dimensions
A postcard is about 5 cubic decimeters wide. Converting to imperial gallons is essential for international postal addressing forms that ask for dimensions in different units across countries.
5 dm³ × 0.2199692483 = 1.0998462415 gal
Real-world example — Ruler-scale measurements
A 30-cubic decimeter school ruler converts cleanly to imperial gallons — useful when buying a desk accessory from a retailer whose product specs use a different unit.
30 dm³ × 0.2199692483 = 6.599077449 gal
Real-world example — Hardware-scale dimensions
A 10-cubic decimeter fastener or component is about as long as a thumbnail. Mechanics and DIY enthusiasts convert between cubic decimeters and imperial gallons daily when mixing metric and imperial tools.
10 dm³ × 0.2199692483 = 2.199692483 gal
Cubic Decimeter to Imperial Gallon conversion table
Standard reference values for converting cubic decimeters to imperial gallons:
| Cubic Decimeter [dm³] | Imperial Gallon [gal] |
|---|---|
| 0.01 | 0.0021996925 |
| 0.1 | 0.0219969248 |
| 1 | 0.2199692483 |
| 2 | 0.4399384966 |
| 3 | 0.6599077449 |
| 4 | 0.8798769932 |
| 5 | 1.0998462415 |
| 10 | 2.199692483 |
| 20 | 4.399384966 |
| 30 | 6.599077449 |
| 40 | 8.798769932 |
| 50 | 10.998462415 |
| 100 | 21.9969248299 |
| 500 | 109.9846241495 |
| 1000 | 219.9692482991 |
Frequently asked questions
How many imperial gallons is 1 cubic decimeter?
How do I convert cubic decimeters to imperial gallons?
How do I convert imperial gallons back to cubic decimeters?
How many imperial gallons is 100 cubic decimeters?
Popular volume unit conversions
Convert Cubic Decimeter to other volume units
Show all Cubic Decimeter conversions
Metric / SI (6 units)
US Customary (Liquid) (8 units)
Imperial (UK) (4 units)
Cubic (length-derived) (3 units)
Cooking / Culinary (3 units)
Sources & references
Conversion factor (1 dm³ = 0.2199692483 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.