gallons to liters calculator
Convert US gallons to liters and cubic feet. Formula, worked example, and a reference table for mixing, dosing, and pool chemical calculations.
US tanks, pools, and containers are measured in gallons, but chemical dosing instructions, paint mixing ratios, and imported product labels are frequently written in liters. This calculator converts a gallon figure into liters and cubic feet so you can follow metric instructions without guesswork.
How this calculator works
One US gallon equals 3.78541 liters, the standard conversion between US customary and metric volume.
Formula: Liters = Gallons × 3.78541. Cubic feet = Gallons × 0.133681.
Worked example
Enter 50 gallons, the calculator’s default:
- Liters: 50 × 3.78541 ≈ 189.27 L
- Cubic feet: 50 × 0.133681 ≈ 6.684 cu ft
That’s about the volume of a small residential water heater tank.
Reference
| Gallons | Liters | Cubic feet |
|---|---|---|
| 10 gal | 37.85 L | 1.337 cu ft |
| 50 gal | 189.27 L | 6.684 cu ft |
| 100 gal | 378.54 L | 13.368 cu ft |
| 250 gal | 946.35 L | 33.420 cu ft |
Where this conversion is used
Concrete sealers, paint additives, and pool chemicals often list a dosing rate per liter even when sold in US gallon containers, especially if the manufacturer also sells internationally. Converting your container or tank’s gallon capacity to liters lets you calculate the correct dose without misreading the label. Going the other direction — converting a liter figure back to gallons — use the Liters to Gallons Calculator, or find a pool’s total capacity with the Pool Gallons Calculator.
Frequently asked questions
How many liters are in a gallon?
One US gallon equals 3.78541 liters. This is the conversion between the US customary volume unit and the metric liter used almost everywhere else in the world.
Why would I convert gallons to liters?
Chemical and paint mixing instructions, imported product labels, and international specification sheets are frequently written in liters. If your tank, container, or dosing rate is in gallons, converting to liters lets you follow those instructions correctly.
Is a US gallon the same as an imperial gallon in liters?
No. A US gallon is 3.78541 liters; a UK imperial gallon is 4.54609 liters — about 20% more. This calculator uses the US gallon, standard for US products and containers.
How does this apply to pool chemicals?
Pool chemical dosing is sometimes given per liter of pool water, especially on imported products. Convert your pool's gallon capacity to liters first, then apply the per-liter dosing rate from the label.
How do I convert liters back to gallons?
Divide liters by 3.78541, or use our Liters to Gallons Calculator directly.
Estimates only. Verify quantities with your supplier before purchasing.