Gallon to Cubic inch Converter
Enter the value that you want to convert gallon (gal) to cubic inch (in³) or cubic inch to gallon.Also written as GAL to IN³ conversion.
1 gallon = 231.0000000 cubic inch
Formula: cubic inch = gallon value × 231.0000000
GAL to IN³ — gallon to cubic inch
10 gallon = 2310.00000 cubic inch
Popular Volume Converters:
Why Convert Gallon to Cubic inch?
The Gallon Explained
Gallon (gal) is a unit of volume measurement. 1 gallon is equal to 231.0000000 cubic inch.
Understanding the Cubic inch
Cubic inch (in³) is a unit of volume measurement. 1 cubic inch is equal to 0.0043290 gallon.
Volume Measurement Systems
Volume units are particularly confusing because the US and UK gallons differ (US gallon = 3.785 L, UK gallon = 4.546 L), as do their pints, cups, and fluid ounces. Cooking, fuel economy, beverage production, and pharmaceutical compounding all require precise volume conversions. Laboratory work uses milliliters and liters while US recipes specify cups, tablespoons, and fluid ounces.
gallon to cubic inch metric conversion table
| 0.01 gal | = | 2.31000 in³ |
| 0.1 gal | = | 23.10000 in³ |
| 1 gal | = | 231.00000 in³ |
| 2 gal | = | 462.00000 in³ |
| 3 gal | = | 693.00000 in³ |
| 4 gal | = | 924.00000 in³ |
| 5 gal | = | 1155.00000 in³ |
| 6 gal | = | 1386.00000 in³ |
| 7 gal | = | 1617.00000 in³ |
| 8 gal | = | 1848.00000 in³ |
| 9 gal | = | 2079.00000 in³ |
| 10 gal | = | 2310.00000 in³ |
| 11 gal | = | 2541.00000 in³ |
| 12 gal | = | 2772.00000 in³ |
| 13 gal | = | 3003.00000 in³ |
| 14 gal | = | 3234.00000 in³ |
| 15 gal | = | 3465.00000 in³ |
| 16 gal | = | 3696.00000 in³ |
| 17 gal | = | 3927.00000 in³ |
| 18 gal | = | 4158.00000 in³ |
| 19 gal | = | 4389.00000 in³ |
| 20 gal | = | 4620.00000 in³ |
| 30 gal | = | 6930.00000 in³ |
| 40 gal | = | 9240.00000 in³ |
| 50 gal | = | 11550.00000 in³ |
| 60 gal | = | 13860.00000 in³ |
| 70 gal | = | 16170.00000 in³ |
| 80 gal | = | 18480.00000 in³ |
| 90 gal | = | 20790.00000 in³ |
| 100 gal | = | 23100.00000 in³ |
| 200 gal | = | 46200.00000 in³ |
| 300 gal | = | 69300.00000 in³ |
| 400 gal | = | 92400.00000 in³ |
| 500 gal | = | 115500.00000 in³ |
| 600 gal | = | 138600.00000 in³ |
| 700 gal | = | 161700.00000 in³ |
| 800 gal | = | 184800.00000 in³ |
| 900 gal | = | 207900.00000 in³ |
| 1000 gal | = | 231000.00000 in³ |
How to Convert GAL to IN³ (Gallon to Cubic inch)?
We can convert gallon to cubic inch by using an example.
Example:
Convert 20 Gallon to Cubic inch?
We know 1 Gallon = 231.0000000 cubic inch; 1 Cubic inch = 0.0043290 gallon.
20 gallon = ___in³
20 × 231.0000000 = 4620.00000 in³ (we know 1 gallon = 231.0000000 cubic inch)
Answer:
20 gallon = 4620.00000 cubic inch
US Gallons to Cubic Inches: Designing Containers
Converting gallons to cubic inches is essential when designing containers, tanks, and packaging — any time you need to know the physical dimensions required to hold a certain number of gallons. Since 1 US gallon equals exactly 231 cubic inches, simply multiply gallons by 231. This lets you work backwards from a desired capacity to determine the container dimensions needed.
- Determine the volume in US gallons.
- Multiply by 231 to convert to cubic inches.
- The result is the internal volume required in cubic inches.
- Example: 5 gallons × 231 = 1,155 in³.
Gallons to Cubic Inches Chart
Common gallon capacities and their cubic inch equivalents for container design:
| Gallon | Cubic inch |
|---|---|
| 0.5 gal | 115.5 in³ |
| 1 gal | 231 in³ |
| 2 gal | 462 in³ |
| 5 gal | 1,155 in³ |
| 10 gal | 2,310 in³ |
| 20 gal | 4,620 in³ |
| 30 gal | 6,930 in³ |
| 55 gal | 12,705 in³ |
Worked Examples: Gallons → Cubic Inches
Question 1: You need to build a rectangular tank holding exactly 3 gallons. What internal volume in cubic inches is required?
Solution:
Cubic inches = gallons × 231
= 3 × 231
= 693 in³
Answer: The tank needs an internal volume of 693 cubic inches (e.g., 11" × 9" × 7").
Question 2: A paint manufacturer needs a can to hold 2.5 gallons. What is the required volume?
Solution:
Cubic inches = 2.5 × 231
= 577.5 in³
Answer: The can must contain 577.5 cubic inches internally.
Question 3: Will a box measuring 8" × 6" × 5" hold 1 gallon of liquid?
Solution:
Box volume = 8 × 6 × 5 = 240 in³
1 gallon = 231 in³
240 > 231, so yes — with 9 in³ to spare
Answer: Yes, the box (240 in³) has enough volume for 1 gallon (231 in³) with a small margin.
Practice Questions
Try solving these on your own to test your understanding:
- How many cubic inches in 7 gallons? (Answer: 1,617 in³)
- A container is 15" × 10" × 8". How many gallons? (Answer: 5.19 gal)
- Convert 0.25 gallons to cubic inches. (Answer: 57.75 in³)
- Design a cube to hold 4 gallons. What side length? (Answer: ∛924 ≈ 9.74")
- A 55-gallon drum — cubic inches? (Answer: 12,705 in³)
Container Design Principles
When designing containers, the cubic inch volume determines what shapes and dimensions are possible. A 5-gallon container (1,155 in³) could be a cube with ~10.5" sides, or a cylinder 10" in diameter and ~14.7" tall. Cylindrical containers maximize strength and minimize material, which is why buckets and drums use this shape. Always account for wall thickness — subtract material from outer dimensions to get true internal volume.
Shipping and Packaging Considerations
Shipping carriers charge by dimensional weight (L × W × H ÷ factor). Knowing gallons-to-cubic-inches helps optimize packaging: a gallon of liquid weighs ~8.3 lbs in a container taking up 231+ in³. Comparing actual weight to dimensional weight helps choose the most cost-effective box size. Rectangular containers pack more efficiently in shipping boxes than cylindrical ones (cylinders waste ~21% of rectangular space).
Key Takeaways
- 1 US gallon = 231 cubic inches exactly.
- Multiply gallons by 231 to get cubic inches.
- Use this for container/tank design — find the cubic inches needed, then choose dimensions.
- A 5-gallon bucket needs at least 1,155 in³ of internal volume.
- For cylinders: Volume (in³) = π × r² × h; set equal to gallons × 231.
Gallon to Cubic inch Conversion Formula
cubic inch = gallon × 231.0000000
1 gallon = 231.0000000 cubic inch
1 cubic inch = 0.0043290 gallon
Reverse: gallon = cubic inch × 0.0043290
Frequently Asked Questions
How many cubic inch are in 1 gallon?
There are 231.0000000 cubic inch in 1 gallon. To convert gallon to cubic inch, multiply the value by 231.0000000.
How do I convert gallon to cubic inch?
Multiply your gallon value by 231.0000000 to get the equivalent in cubic inch. For example, 5 gallon = 5 × 231.0000000 = 1155.00000 cubic inch.
How do I convert cubic inch to gallon?
Multiply your cubic inch value by 0.0043290 to get the equivalent in gallon. Alternatively, divide by 231.0000000.
What is 10 gallon in cubic inch?
10 gallon is equal to 2310.00000 cubic inch.
What is 100 gallon in cubic inch?
100 gallon is equal to 23100.00000 cubic inch.