What is a UK Imperial Fish Tank Calculator?
A UK Imperial fish tank calculator computes aquarium water volume specifically in UK Imperial gallons (4.546 L per gallon), ensuring accurate dosing of UK-manufactured fish medications.
Review UK fish-keeping and aquarium water-quality guidance in the GOV.UK fish welfare guidance.
UK Imperial Aquarium Formulas
Inches to UK Imperial Gallons:
Volume (UK Gal) = (Length × Width × Height in inches) / 277.42
Litres to UK Imperial Gallons:
Volume (UK Gal) = Litres / 4.54609
How to Calculate UK Imperial Aquarium Volume
- Measure Tank Dimensions: Record inside glass length, width, and height in inches or cm.
- Calculate Cubic Inches: Multiply length × width × height.
- Divide by 277.42: Divide cubic inches by 277.42 to find UK Imperial Gallons.
- Subtract Substrate Displacement: Deduct 10-15% for gravel and aquascaping rocks.
UK Imperial Sizing Walkthrough
For an aquarium measuring 36 inches long, 15 inches wide, and 18 inches high:
Cubic Inches = 36 × 15 × 18 = 9,720 cubic inchesGross UK Imperial Gallons = 9,720 / 277.42 ≈ 35.04 UK GallonsEquivalent Litres = 35.04 × 4.54609 ≈ 159.29 Litres
UK Imperial Aquarium Sizing Reference Table
| Aquarium Sizing | Dimensions (Inches: L × W × H) | UK Imperial Gallons | US Gallons | Litres |
|---|---|---|---|---|
| Small Aquarium | 24" × 12" × 12" | 12.47 UK gal | 14.96 US gal | 56.6 L |
| Medium Tank | 36" × 12" × 15" | 23.38 UK gal | 28.05 US gal | 106.2 L |
| Large 3ft Tank | 36" × 18" × 18" | 42.07 UK gal | 50.49 US gal | 191.2 L |
| Standard 4ft Tank | 48" × 15" × 18" | 46.75 UK gal | 56.10 US gal | 212.5 L |
| Large 4ft Tank | 48" × 18" × 21" | 65.45 UK gal | 78.54 US gal | 297.5 L |
Imperial vs US Gallon Difference
An Imperial Gallon (4.546 Litres) is 20% larger than a US Gallon (3.785 Litres). Always check medication dosing instructions to specify whether UK or US gallons are required.
UK Imperial Gallons vs US Gallons in Fish Keeping
Aquarists in the UK often distinguish between UK Imperial Gallons (4.546 litres) and US Liquid Gallons (3.785 litres). Purchasing aquatic treatments, water conditioners, or medication manufactured in different regions requires verifying which gallon unit is specified on the label.