💧 US Gallons to UK Gallons Converter
Convert aquarium and pond volume between US gallons, UK gallons, liters, water weight, dimensions, and dosing amounts.
| Profile | Density Basis | lb per US gal | kg per liter |
|---|---|---|---|
| Freshwater, 25°C | 1.000 kg/L | 8.345 | 1.000 |
| Cool freshwater, 10°C | 0.9997 kg/L | 8.343 | 0.9997 |
| Warm freshwater, 30°C | 0.9957 kg/L | 8.309 | 0.9957 |
| Brackish, SG 1.010 | 1.010 kg/L | 8.429 | 1.010 |
| Saltwater, SG 1.023 | 1.023 kg/L | 8.537 | 1.023 |
| Reef saltwater, SG 1.026 | 1.026 kg/L | 8.562 | 1.026 |
| Outdoor pond estimate | 0.999 kg/L | 8.337 | 0.999 |
| Scenario | Dimensions | US gal | UK gal | Liters | Freshwater Weight |
|---|---|---|---|---|---|
| 10 gallon tank | 20 × 10 × 12 in | 10.0 | 8.33 | 37.9 | 83 lb |
| 20 long tank | 30 × 12 × 12 in | 20.0 | 16.65 | 75.7 | 167 lb |
| 40 breeder | 36 × 18 × 16 in | 40.4 | 33.67 | 153 | 337 lb |
| 55 gallon tank | 48 × 13 × 21 in | 56.7 | 47.21 | 215 | 473 lb |
| 75 gallon tank | 48 × 18 × 21 in | 78.5 | 65.38 | 297 | 655 lb |
| 125 gallon tank | 72 × 18 × 22 in | 123.4 | 102.76 | 467 | 1030 lb |
| 500 gallon pond | Direct volume | 500 | 416.3 | 1893 | 4173 lb |
| 1500 gallon pond | Direct volume | 1500 | 1248.8 | 5678 | 12518 lb |
| Label Instruction | Equivalent Base | For 10 US gal | For 55 US gal |
|---|---|---|---|
| 5 mL per 10 US gal | 37.85 L | 5.0 mL | 27.5 mL |
| 5 mL per 10 UK gal | 45.46 L | 4.16 mL | 22.9 mL |
| 1 tsp per 20 US gal | 75.71 L | 0.5 tsp | 2.75 tsp |
| 10 mL per 100 L | 26.42 US gal | 3.79 mL | 20.8 mL |
| 1 drop per 1 US gal | 3.785 L | 10 drops | 55 drops |
| Calculation | Formula | Use | Notes |
|---|---|---|---|
| US gal to liters | US gal × 3.785411784 | Metric labels | Exact liquid gallon factor |
| Liters to UK gal | L ÷ 4.54609 | Imperial labels | UK imperial gallon |
| US gal to UK gal | US gal × 0.832674 | Tank comparisons | UK gallons are larger |
| Rectangle volume | L × W × H ÷ 231 | Measured tanks | Inches to US gallons |
| Cylinder volume | π × r² × H | Tubs, vats | Converted from cubic units |
| Dose scaling | Dose × target ÷ base | Treatments | Convert both volumes to liters first |
When you find an aquarium or an pond containing a label attached to it, you will find a volume number printed on that label. However, that volume may not necessarily be the amount of water that the aquarium or pond contains. The manufacturer may have used a different definition of the unit of volume called a gallon.
Additionally, the aquarium and pond may not contain the same amount of water as the volume of the container itself due to the substrate and the equipment that it contain. The density of the water may also change depending upon the temperature and the salinity of the water within the aquarium or pond. All these factor may lead to a difference between the volume that is labeled on the aquarium or pond and the actual volume of water that it contains.
How to measure and convert the water volume of your aquarium or pond
To account for these different variables, you should use a conversion tool to determine the correct volume for your aquarium or pond. The number of liters contained within both a US gallon and a UK gallon are not the same. A US gallon contains 3.785 liters of liquid while a UK gallon contain 4.546 liters.
This means that if an aquarium or pond contains fifty US gallons of water, it only contains forty-two UK gallons. If using a medication dosage bottle from the UK, using the liquid without adjusting the dosage will lead to under-dosing the aquarium or pond. Using a product from the United States in a water volume that is measured in UK gallons may lead to overdosing the aquarium or pond.
Using a medication dosage converter will allow you to accurate convert the medication bottle to the volume of the aquarium or pond it is to be used in. The weight of water may change depending upon the temperature of the water and the salinity of the water. Cold freshwater is denser than warm freshwater.
Additionally, the density of saltwater is more than freshwater; saltwater contains almost three percent more mass per liter of water than freshwater does. Using the assumption that one gallon of water weigh eight and a third pounds is inaccurate. The weight of the water changes depending upon the density of the water.
Using this tool, you may select the water profile in the tool which will determine the weight of the water that is in the aquarium or pond. The outside measurements of an aquarium or pond may not accurately reflect the amount of water that it contains. The thickness of the aquarium or pond’s glass, the depth of the substrate within the tank, and the equipment that is contained within the aquarium can all impact the true volume of water that it contains.
The dimension calculator for the aquarium or pond allow for these factors to be accounted for. Enter the interior measurements of the aquarium or pond and the percentage of fill in the tank. The tool will provide you with the volume of the water that the tank will contain in liters as well as in gallons of both the US and the UK.
When dosing medications for aquarium or pond water, the type of gallon that is used will impact the dosage. Using the US and the UK gallons differently may impact the dosage of the medication. By knowing the number of liters that your aquarium or pond contains, this tool will allow the tool to automatically scale the dosage of the medication for you.
This help to avoid the errors that may occur from manually converting gallons to liters or milliliters. The volume of a pond changes over time due to variables like evaporation and the creation of freeboard around the pond’s edge. The volume may change with the seasons.
A pond keeper must take into account these variables and account for the current volume of the pond that exist. Enter the volume of the pond that you wish to treat into the calculator, and it will provide the figures that have been converted to the other units. This calculator allows you to use the same mathematical equations that you may use for an aquarium for your pond of any size.
The ratio of the number of liters contained within a US gallon and a UK gallon will remain the same regardless of the temperature of the water. However, the weight of the water does change with the temperature. Using the tool, you can determine the volume of water in the aquarium or pond as well as the weight of that water.
Use the tool to measure your aquarium or pond in the units that are most convenient for you. Enter those measurements into the tool to convert the volume of your water feature to all other units. This avoids the mental arithmetic that you may otherwise have to perform to determine these measurements.
Using the correct dosage of medication for your pond or aquarium will help to maintain the health of the livestock within the water. Using such a tool will eliminate any uncertainties regarding the volume and weight of water in your features. However, the tool is merely a tool; you are still responsible for appropriately observing your fish or other livestock in the aquarium and pond.
