Convert US Gallon to Acre-Inch
Convert us gallons to acre-inches instantly. 1 us gallon = 3.68266e-5 acre-inch — use the live calculator, the exact formula, a conversion table and worked examples. Also check the Acre-Inch 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.
Acre-Inch
An acre-inch is one acre covered to a depth of one inch (102.79 m³), one twelfth of an acre-foot.
Combines the acre and the inch for irrigation accounting.
Used in agricultural irrigation scheduling.
US agriculture.
US Gallon to Acre-Inch conversion formula
The relationship between us gallons and acre-inches:
To convert us gallons to acre-inches, multiply the value in us gallons by 3.68266e-5. To reverse, multiply acre-inches by 27154.2857142857.
How to use this converter
Type a value into the calculator. The result in acre-inches updates as you type. Tap a quick value, copy the result with one click, or use the swap arrow to jump straight to the Acre-Inch to US Gallon converter for the reverse direction.
Step-by-step: convert us gallons to acre-inches
- Write down the value in us gallons (gal).
- Multiply that value by the factor 3.68266e-5.
- The product is the equivalent value in acre-inches (ac·in).
- To reverse, multiply the acre-inch value by 27154.2857142857.
Worked examples
Example 1 — Convert 1 gal to ac·in:
1 × 3.68266e-5 = 3.68266e-5 ac·in
Example 2 — Convert 100 gal to ac·in:
100 × 3.68266e-5 = 0.0036826599 ac·in
Real-world example — Hardware-scale dimensions
A 10-us gallon fastener or component is about as long as a thumbnail. Mechanics and DIY enthusiasts convert between us gallons and acre-inches daily when mixing metric and imperial tools.
10 gal × 3.68266e-5 = 0.000368266 ac·in
Real-world example — Postcard and small-object dimensions
A postcard is about 5 us gallons wide. Converting to acre-inches is essential for international postal addressing forms that ask for dimensions in different units across countries.
5 gal × 3.68266e-5 = 0.000184133 ac·in
Real-world example — Ruler-scale measurements
A 30-us gallon school ruler converts cleanly to acre-inches — useful when buying a desk accessory from a retailer whose product specs use a different unit.
30 gal × 3.68266e-5 = 0.001104798 ac·in
US Gallon to Acre-Inch conversion table
Standard reference values for converting us gallons to acre-inches:
| US Gallon [gal] | Acre-Inch [ac·in] |
|---|---|
| 0.01 | 3.68266e-7 |
| 0.1 | 3.68266e-6 |
| 1 | 3.68266e-5 |
| 2 | 7.36532e-5 |
| 3 | 0.0001104798 |
| 4 | 0.0001473064 |
| 5 | 0.000184133 |
| 10 | 0.000368266 |
| 20 | 0.000736532 |
| 30 | 0.001104798 |
| 40 | 0.001473064 |
| 50 | 0.00184133 |
| 100 | 0.0036826599 |
| 500 | 0.0184132997 |
| 1000 | 0.0368265993 |
Frequently asked questions
How many acre-inches is 1 us gallon?
How do I convert us gallons to acre-inches?
How do I convert acre-inches back to us gallons?
How many acre-inches 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 = 3.68266e-5 ac·in) 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.