How the conversion works
20 × 3.785411784 = 75.70824 L. The quick answer is rounded for readability; use the live calculator below for another value or more precision.
20 US Gallons to Liters: 75.70824 L
20 US gallons equal 75.70824 liters (litres). See the exact US-gallon factor, formula, nearby values and why an Imperial gallon differs.
Quick reference
75.70824 L
20 US gal → liters
When this is useful
Volume conversions are useful for recipes, liquid containers, tank capacities, product specifications and measurements that mix liters, milliliters, cubic units and gallons.
Quick comparison table
Compare the current answer with nearby or reverse values from the same converter family. Open any row to keep the units preselected and change the number.
Which gallon do you mean?
20 gallons is 75.71 liters only for US gallons. British and Commonwealth sources often mean the imperial gallon, which is about 20% larger, so the same "20 gallons" can be 90.92 liters.
| Gallon type | Size of 1 gallon | 20 gallons in liters |
|---|---|---|
| US liquid gallon (USA, most product labels) | 3.785411784 L | 75.71 L |
| Imperial gallon (UK, older Commonwealth use) | 4.54609 L | 90.92 L |
| US dry gallon (rare, dry goods) | 4.405 L | 88.10 L |
- A "20-gallon" aquarium sold in the US holds about 75.7 liters of water, and that water weighs roughly 75.7 kg, before gravel and decorations take up space.
- If the number comes from a UK fuel, boat or tank specification, use 90.92 liters.
- The reverse: 75.71 liters is 20 US gallons, but only 16.65 imperial gallons.
Mental check: multiply US gallons by 3.8. 20 × 3.8 = 76 L, within 0.4% of the exact 75.71 L. Multiplying by 4 gives 80 L, which is 5.7% too high.
Convert another value
75.70823568 L
20 gal
Volume uses US liquid gallons for “gal”. Imperial gallons use a different factor.
A quick note before you use the number
“gal” in this calculator means US liquid gallon. An imperial gallon is a different size, so do not substitute one standard for the other.
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