Surface Area

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Working out your surface area can be useful when planning aquascapes or working out volume.

Technically, these formulas are just working out 'area', but for aquatic purposes we can call it 'surface area'.


Surface area | Rectangle

Rectangle surface area Area = (AxB)
Distance A (cm)
Distance B (cm)

Your Surface Area is
Cm²

Surface area | Circle

Circle surface area Area = (Pi Π x r2)
Radius

Your Surface area is
Cm²

Surface area | Triangle

Triangle surface area Area = (AxB)/2
Distance A (cm)
Distance B (cm)

Your Surface Area is
Cm²

Surface area | Hexagon

Hexagon surface area Area = (AxB) x0.5 x6
Distance A (cm)
Distance B (cm)

Your Surface Area is
Cm²

Surface area | Octagon

Octagon surface area Area = (AxB) x0.5 x8
Distance A (cm)
Distance B (cm)

Your Surface Area is
Cm²

Surface area | Trapezoid

Trapezoid surface area Area = C/2 x (A+B)
Distance A (cm)
Distance B (cm)
Distance C (cm)

Your Surface Area is
Cm²

Volume from surface area

Assuming straight sides and the same depth through the tank, you can easily work out the volume of your tank by multiplying the surface area by the height and dividing by 1000:

Surface area (Cm²)
Height (cm)

Litres
Imperial Gallons
US Gallons

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