Cylinder Volume Gallons to Liters Calculator
Convert imperial and US gallon cylinder capacities into metric liters. One US liquid gallon equals 3.78541 liters, while one UK imperial gallon equals 4.54609 liters. This calculator helps mechanics, plant operators, and transport specialists translate gallon tank ratings into liters for fuel tanks, oil drums, and bulk chemical storage. Enter your gallon capacity or cylinder dimensions below.
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Imperial fluid tank conversion and volume standards
Liquid storage containers in North America and historical Commonwealth markets are rated in gallons. However, international shipping, scientific specifications, and metric equipment require volume in liters.
When converting a cylindrical tank from gallons to liters, identifying whether the tank rating is in US liquid gallons or UK imperial gallons is the most critical first step.
US liquid gallon vs UK imperial gallon standards
The term gallon refers to two different physical capacities depending on the country of origin. Confusing the two standards leads to a 20 percent discrepancy in volume calculations.
Here is the breakdown of the two primary gallon definitions:
- US Liquid Gallon: Legally defined as exactly 231 cubic inches (3.785411784 liters). This standard is used across the United States and parts of Latin America.
- UK Imperial Gallon: Legally defined as the volume of 10 pounds of distilled water weighed in air at 62 degrees Fahrenheit, which equals exactly 277.4194 cubic inches (4.54609 liters). This standard is used historically in the UK, Canada, Australia, and New Zealand.
- Mathematical Difference: 1 UK Imperial Gallon = 1.20095 US Liquid Gallons. A UK gallon is 20.09 percent larger than a US gallon.
Standard industrial drum and fuel container capacities
Cylindrical tanks and containers are manufactured in standard gallon sizes across the manufacturing and logistics industries. The reference table below details their exact metric liter equivalents:
| Standard Container Type | US Gallons | UK Gallons | Metric Liters | Cubic Feet (ft³) |
|---|---|---|---|---|
| Small Fuel Jerrycan | 5.0 gal | 4.16 gal | 18.93 L | 0.668 ft³ |
| Standard Grease / Lube Pail | 5.0 gal | 4.16 gal | 18.93 L | 0.668 ft³ |
| Passenger Car Fuel Tank | 14.0 gal | 11.66 gal | 52.99 L | 1.872 ft³ |
| Pickup Truck Fuel Tank | 26.0 gal | 21.65 gal | 98.42 L | 3.476 ft³ |
| Beer Keg (US Half Barrel) | 15.5 gal | 12.91 gal | 58.67 L | 2.072 ft³ |
| Standard Steel Oil Drum | 55.0 gal | 45.80 gal | 208.20 L | 7.352 ft³ |
| Intermediate Bulk Container (IBC) | 275.0 gal | 228.97 gal | 1,040.99 L | 36.762 ft³ |
| Heavy Chemical Tote | 330.0 gal | 274.77 gal | 1,249.19 L | 44.114 ft³ |
| Small Agricultural Tank | 500.0 gal | 416.32 gal | 1,892.71 L | 66.840 ft³ |
Calculating drum volume from physical measurements
To find the liquid capacity of an unmarked cylindrical drum or fuel tank in liters from dimensions in inches, follow these steps:
1. Measure the internal diameter and height in inches. For example, a steel drum with diameter 22.5 inches and height 33.5 inches.
2. Calculate the cylinder volume in cubic inches: V = (π / 4) × 22.5² × 33.5 = 13,319.4 cubic inches.
3. Divide by 231 to determine US gallons: 13,319.4 ÷ 231 = 57.66 gross US gallons.
4. Multiply by 3.78541 to determine total capacity in liters: 57.66 × 3.78541 = 218.27 liters (or roughly 208 liters allowing for top expansion headspace).
Two-way metric conversions and general reference
If you need a general two-way converter covering 1 to 1000 liters with step-by-step metric breakdown, explore our primary Liters to Gallons Two-Way Converter.
Commercial shipping regulations and metric labeling
International freight and maritime hazardous material regulations (such as IMO and UN packing codes) mandate dual labeling in both US gallons and metric liters.
Standard steel shipping drums embossed with a UN 1A1 rating feature gross metric capacities alongside their nominal 55 US gallon rating. Shippers moving drums across international borders must record consignment weights in metric kilograms and fluid volume in liters on manifest documentation.
Using precise conversion factors ensures cargo weights match international shipping declarations without customs discrepancies.
Frequently Asked Questions
How do I convert US gallons to liters manually?
Multiply the number of US gallons by 3.78541. For example, 55 US gallons multiplied by 3.78541 equals 208.2 liters.
How do I convert UK imperial gallons to liters?
Multiply the number of UK gallons by 4.54609. For example, 10 UK gallons multiplied by 4.54609 equals 45.46 liters.
Why is a 55-gallon drum 208 liters instead of 200 liters?
A standard 55 US gallon drum holds exactly 55 × 3.78541 = 208.2 liters. European metric drums are sometimes manufactured at an even 200 liters (52.8 US gal).
How much does one US gallon of water weigh in kilograms?
One US gallon of pure water contains 3.785 liters and weighs exactly 3.785 kilograms (8.34 pounds) at standard room temperature.
What is the volume in liters of a 275-gallon IBC tote?
A 275 US gallon intermediate bulk container (IBC tote) holds 1,040.99 liters of liquid.