### AQUARIUM CALCULATOR

This aquarium calculator will help you convert between Imperial, metric and US units of measure. There are a couple of important points we would like to make first, about stocking levels and total weight.

#### Stocking level

One of the most important things to get right is knowing how many goldfish you can keep in order to reduce the risk of poor water quality (see Golden Rules for full advice on keeping healthy fish). It is the surface area (length x width) of an aquarium that determines stocking levels, as fish need a certain amount of surface area for enough oxygen to dissolve into the water.

As a guide (but see the notes below!), in a coldwater aquarium you should allow:

• 60 square cm for each 1 cm of fish body length excluding the tail
or
• 24 square inches for each 1 inch of fish body length excluding the tail.

For example, in a 60 x 30 cm (24 x 12 inch) tank you can keep a total of 30 cm (12 inches) of combined fish body length, such as three 10 cm-long fishes (three fish each 4 inches long), or two 15 cm-long fishes (two fish each 6 inches long).

• this rule-of-thumb assumes satisfactory filtration and aeration are provided;
• some authorities quote 30 square inches for each 1 inch of fish body length instead of 24 square inches;
• larger fish have a proportionally larger body mass than smaller fish and therefore proportionally larger oxygen needs (e.g. one goldfish 6 inches long has greater oxygen needs than 6 fish each 1 inch long).

You should therefore be conservative when deciding upon stocking levels - do not overcrowd your fish, or you will create water quality problems and fish health will suffer.

#### Weight

The weights given are the weight of water only. Please remember to add appropriate amounts for the dry aquarium, the hood, gravel & rocks, internal filtration and the stand in order to find the total weight of an aquarium (for example, when considering where to position it).

### Surface area and number of fish calculation

Working in inches
Enter length:
Enter width:
Surface area sq in:

Based on this surface area, you should aim to keep
no more than the following total length (inches) of goldfish:

Working in centimetres
Enter length:
Enter width:
Surface area sq cm:

Based on this surface area, you should aim to keep
no more than the following total length (cm) of goldfish:

### Temperature conversion

Fahrenheit to Celsius
Enter °F: Result °C:

Celsius to Fahrenheit
Enter °C: Result °F:

### Length conversion

Inches to centimetres
Enter inches: Result cm:

Centimetres to inches
Enter cm: Result in:

### Volume and weight calculation

Working in Imperial measures (inches, gallons & lbs)
Enter length:
Enter width:
Enter height:
Volume in UK gals:
Volume in US gals:
Weight in lbs:

Working in metric measures (centimetres, litres & kilos)
Enter length:
Enter width:
Enter height:
Volume in litres:
Weight in kilos:

### Volume conversion

UK gallons to litres and US gallons
Enter UK gals: Result litres:
Result US gals:

US gallons to litres and UK gallons
Enter US gals: Result litres:
Result UK gals:

Litres to UK gallons and US gallons
Enter litres: Result UK gals:
Result US gals:

If you do not have a rectangular aquarium, we regret that this calculator will be of limited use; we may add further functionality in due course.

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