Convert US gallons to Koku (石)
East Asia · East Asian Volume · historical · medieval
Historically reconstructed The unit is no longer in use and its value is reconstructed from historical and scholarly sources — treat it as indicative.
1 US gallon = 0.0209846 Koku (石)
Koku (石) = US gallons × 0.020984599
Convert any amount
US gallons to Koku (石) table
| US gallons | Koku (石) |
|---|---|
| 0.25 US gallons | 0.00524615 Koku (石) |
| 0.5 US gallons | 0.0104923 Koku (石) |
| 1 US gallon | 0.0209846 Koku (石) |
| 2 US gallons | 0.0419692 Koku (石) |
| 3 US gallons | 0.0629538 Koku (石) |
| 4 US gallons | 0.0839384 Koku (石) |
| 5 US gallons | 0.104923 Koku (石) |
| 10 US gallons | 0.209846 Koku (石) |
| 20 US gallons | 0.419692 Koku (石) |
| 25 US gallons | 0.524615 Koku (石) |
| 50 US gallons | 1.04923 Koku (石) |
| 100 US gallons | 2.09846 Koku (石) |
About the Koku (石)
Japanese rice measure. Defined feudal wealth. 1 Koku ≈ 180 liters.
- Symbol
- 石
- Value in SI
- 1 Koku (石) = 180.39 litre
- Typical use
- agriculture, trade
- Source
- Edo period standard
Every atlas conversion routes through the SI litre. See our methodology and data provenance pages for how these values are sourced and verified.
Related units and variant risk
Other east asian volume units in the East Asia family, least settled first. If your figure came from a land record, invoice or historical document rather than a calculator, check these before assuming a single standard.
Related conversions
Frequently asked
How many Koku (石) are in a US gallon?
1 US gallon = 0.0209846 Koku (石). Multiply the number of US gallons by 0.020984599 to get Koku (石).
What is Koku (石) used for?
Japanese rice measure. Defined feudal wealth. 1 Koku ≈ 180 liters. It is classified as historical and dates from the medieval period.
Is the Koku (石) value exact?
Yes for practical purposes. UnitConvertLab converts every atlas unit through the SI litre, using the value published by Edo period standard, so the arithmetic itself introduces no rounding beyond the digits shown.
How reliable is this Koku (石) conversion?
Historically reconstructed — The unit is no longer in use and its value is reconstructed from historical and scholarly sources — treat it as indicative. Source: Edo period standard.
Cite this page
UnitConvertLab. (2026). Convert US gallons to Koku (石). UnitConvertLab. Retrieved from https://unitconvertlab.com/regional/us-gallon-to-koku
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