Cubic Feet to Gallons (UK) Calculator | Precise Volume Converter

Cubic Feet to Gallons (UK) Calculator

Quick and accurate volume conversion for water storage, aquariums, and more

Volume Converter

Enter Volume in Cubic Feet:

ft³

Or Calculate from Dimensions:

feet

Common Container Shapes:

↓

How to Convert Cubic Feet to UK Gallons

The Formula

UK Gallons = Cubic Feet × 6.22884

This is because one cubic foot equals precisely 6.22884 UK gallons (Imperial gallons).

Note: UK gallons differ from US gallons. 1 cubic foot = 7.48052 US gallons.

Step-by-Step Process

Measure or calculate your volume in cubic feet
Multiply the number of cubic feet by 6.22884
The result is your volume in UK gallons

UK gallons (Imperial) are approximately 20% larger than US gallons. Make sure you’re using the right conversion for your needs!

Practical Examples

Home Aquarium

For a rectangular aquarium measuring 3 feet long, 1 foot wide, and 2 feet high:

Step 1: Calculate cubic feet

3 ft × 1 ft × 2 ft = 6 cubic feet

Step 2: Convert to UK gallons

6 ft³ × 6.22884 = 37.37 UK gallons

Therefore, your aquarium can hold approximately 37.4 UK gallons of water.

Aquarium Tip

When filling an aquarium, remember to account for displacement from decorations, equipment, and substrate. Typically, subtract 10-15% from your total volume calculation.

Water Storage Tank

For a cylindrical water storage tank with 4 feet diameter and 6 feet height:

Step 1: Calculate cubic feet

Volume = π × (diameter/2)² × height

Volume = 3.14159 × (4/2)² × 6

Volume = 3.14159 × 4 × 6 = 75.4 cubic feet

Step 2: Convert to UK gallons

75.4 ft³ × 6.22884 = 469.65 UK gallons

Your cylindrical water tank can hold approximately 470 UK gallons.

Storage Tank Tip

For safety and practicality, water tanks should normally only be filled to about 90% capacity to prevent overflow and allow for expansion.

Swimming Pool

For a rectangular swimming pool measuring 20 feet long, 10 feet wide, with an average depth of 5 feet:

Step 1: Calculate cubic feet

20 ft × 10 ft × 5 ft = 1,000 cubic feet

Step 2: Convert to UK gallons

1,000 ft³ × 6.22884 = 6,228.84 UK gallons

Your swimming pool holds approximately 6,229 UK gallons of water.

Swimming Pool Tip

Knowing your pool’s capacity in gallons is essential for proper chemical treatment. Most pool chemicals specify dosage rates per gallon of water.

Common Conversion Values

Cubic Feet (ft³)	UK Gallons (Imp. gal)	Common Reference
0.5	3.11	Small fish tank
1	6.23	Standard bucket
2	12.46	Small bathtub
5	31.14	Standard bathtub
10	62.29	Small hot tub
50	311.44	Garden pond
100	622.88	Small swimming pool
500	3,114.42	Medium swimming pool
1,000	6,228.84	Large swimming pool

Frequently Asked Questions

What is the difference between UK gallons and US gallons?

A UK (Imperial) gallon is approximately 20% larger than a US gallon:

1 UK gallon = 1.20095 US gallons
1 UK gallon = 4.54609 liters
1 US gallon = 3.78541 liters

This difference is important to consider for accurate measurements, especially in scientific or commercial applications.

Why would I need to convert between cubic feet and UK gallons?

This conversion is useful for:

Aquarium and fish pond capacity calculations
Water storage tank sizing
Swimming pool volume determination
Fluid transport calculations in UK and Commonwealth countries
Historical or traditional British measurement applications

How accurate is this calculator?

This calculator uses the precise conversion factor of 6.22884 UK gallons per cubic foot, which is accurate to 5 decimal places. For most practical applications, this level of precision is more than adequate.

How do I calculate the volume for irregularly shaped containers?

For irregularly shaped containers:

Break down the shape into basic geometric forms (rectangles, cylinders, etc.)
Calculate the volume of each part in cubic feet
Add the volumes together
Convert the total cubic feet to UK gallons using this calculator

For very complex shapes, consider using water displacement methods for direct measurement.

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