Convert US Gallon to Hectoliter
Convert us gallons to hectoliters instantly. 1 us gallon = 0.0378541178 hectoliter — use the live calculator, the exact formula, a conversion table and worked examples. Also check the Hectoliter to US Gallon converter for the reverse conversion.
Units explained
US Gallon
The US liquid gallon is defined as exactly 231 cubic inches (3.785411784 liters).
Based on the English wine gallon of 231 cubic inches, retained by the US after 1824.
The primary US unit for fuel, milk and large beverage containers.
English wine gallon; US since 1824.
Hectoliter
A hectoliter is 100 liters (0.1 m³).
Formed with the SI prefix hecto- applied to the liter.
Standard in brewing, winemaking and agricultural trade across Europe.
Metric prefix system.
US Gallon to Hectoliter conversion formula
The relationship between us gallons and hectoliters:
To convert us gallons to hectoliters, multiply the value in us gallons by 0.0378541178. To reverse, multiply hectoliters by 26.4172052358.
How to use this converter
Type a value into the calculator. The result in hectoliters updates as you type. Tap a quick value, copy the result with one click, or use the swap arrow to jump straight to the Hectoliter to US Gallon converter for the reverse direction.
Step-by-step: convert us gallons to hectoliters
- Write down the value in us gallons (gal).
- Multiply that value by the factor 0.0378541178.
- The product is the equivalent value in hectoliters (hL).
- To reverse, multiply the hectoliter value by 26.4172052358.
Worked examples
Example 1 — Convert 1 gal to hL:
1 × 0.0378541178 = 0.0378541178 hL
Example 2 — Convert 100 gal to hL:
100 × 0.0378541178 = 3.785411784 hL
Real-world example — Furniture and large objects
A 72-us gallon piece of furniture converts to a value in hectoliters that's easier to mentally compare with room dimensions. This is the typical workflow when shopping internationally and product specs use a different unit than your room measurements.
72 gal × 0.0378541178 = 2.7254964845 hL
Real-world example — Children's height milestones
A 150-us gallon-tall child measures a value in hectoliters that's commonly used for theme-park ride height requirements when travelling between countries that use different measurement units.
150 gal × 0.0378541178 = 5.678117676 hL
Real-world example — Body height conversion
You enter your height as 180 us gallons into an international job or visa application. The form then asks for the same value in hectoliters — converting between these adjacent units is one of the most-used length conversions globally.
180 gal × 0.0378541178 = 6.8137412112 hL
US Gallon to Hectoliter conversion table
Standard reference values for converting us gallons to hectoliters:
| US Gallon [gal] | Hectoliter [hL] |
|---|---|
| 0.01 | 0.0003785412 |
| 0.1 | 0.0037854118 |
| 1 | 0.0378541178 |
| 2 | 0.0757082357 |
| 3 | 0.1135623535 |
| 4 | 0.1514164714 |
| 5 | 0.1892705892 |
| 10 | 0.3785411784 |
| 20 | 0.7570823568 |
| 30 | 1.1356235352 |
| 40 | 1.5141647136 |
| 50 | 1.892705892 |
| 100 | 3.785411784 |
| 500 | 18.92705892 |
| 1000 | 37.85411784 |
Frequently asked questions
How many hectoliters is 1 us gallon?
How do I convert us gallons to hectoliters?
How do I convert hectoliters back to us gallons?
How many hectoliters is 100 us gallons?
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Metric / SI (15 units)
US Customary (Liquid) (14 units)
US Customary (Dry) (5 units)
Imperial (UK) (14 units)
Cubic (length-derived) (4 units)
Cooking / Culinary (5 units)
Sources & references
Conversion factor (1 gal = 0.0378541178 hL) 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.