Convert Tun to Imperial Gallon
Convert tuns to imperial gallons instantly. 1 tun = 209.8338945265 imperial gallon — use the live calculator, the exact formula, a conversion table and worked examples. Also check the Imperial Gallon to Tun converter for the reverse conversion.
Units explained
Tun
A tun is 252 US gallons (953.92 L), the largest traditional liquid cask.
From Old English/French for a large barrel; the basis of 'tonnage'.
Historical for wine and the origin of ship tonnage.
Medieval cask 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.
Tun to Imperial Gallon conversion formula
The relationship between tuns and imperial gallons:
To convert tuns to imperial gallons, multiply the value in tuns by 209.8338945265. To reverse, multiply imperial gallons by 0.0047656743.
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 Tun converter for the reverse direction.
Step-by-step: convert tuns to imperial gallons
- Write down the value in tuns (tun).
- Multiply that value by the factor 209.8338945265.
- The product is the equivalent value in imperial gallons (gal).
- To reverse, multiply the imperial gallon value by 0.0047656743.
Worked examples
Example 1 — Convert 1 tun to gal:
1 × 209.8338945265 = 209.8338945265 gal
Example 2 — Convert 100 tun to gal:
100 × 209.8338945265 = 20983.3894526505 gal
Real-world example — Fabric and tailoring
One tun of fabric converts to a value in imperial gallons commonly used for seam allowances. Garment patterns frequently switch between the two units on a single instruction sheet.
1 tun × 209.8338945265 = 209.8338945265 gal
Real-world example — Body height conversion (reverse direction)
You measure 1.75 tuns tall and need to fill in a gym membership form or medical record that asks for height in imperial gallons. This is the most-used everyday length conversion in metric-using countries.
1.75 tun × 209.8338945265 = 367.2093154214 gal
Real-world example — Pet and accessory dimensions
A 3-tun dog leash equals a tidy round value in imperial gallons. Pet-supply shopping frequently mixes the two units across product specifications.
3 tun × 209.8338945265 = 629.5016835795 gal
Tun to Imperial Gallon conversion table
Standard reference values for converting tuns to imperial gallons:
| Tun [tun] | Imperial Gallon [gal] |
|---|---|
| 0.01 | 2.0983389453 |
| 0.1 | 20.9833894527 |
| 1 | 209.8338945265 |
| 2 | 419.667789053 |
| 3 | 629.5016835795 |
| 4 | 839.335578106 |
| 5 | 1049.1694726325 |
| 10 | 2098.3389452651 |
| 20 | 4196.6778905301 |
| 30 | 6295.0168357952 |
| 40 | 8393.3557810602 |
| 50 | 10491.6947263253 |
| 100 | 20983.3894526505 |
| 500 | 104916.9472632526 |
| 1000 | 209833.8945265052 |
Frequently asked questions
How many imperial gallons is 1 tun?
How do I convert tuns to imperial gallons?
How do I convert imperial gallons back to tuns?
How many imperial gallons is 100 tuns?
Popular volume unit conversions
Convert Tun to other volume units
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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 tun = 209.8338945265 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 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.