# Surface Area Calculator

Author: Last updated:

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

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

### Surface area | Rectangle Area = (AxB)
Distance A (cm)
Distance B (cm)

Your Surface Area is
Cm²

### Surface area | Circle Area = (Pi Π x r2)

Your Surface area is
Cm²

### Surface area | Triangle Area = (AxB)/2
Distance A (cm)
Distance B (cm)

Your Surface Area is
Cm²

### Surface area | Hexagon Area = (AxB) x0.5 x6
Distance A (cm)
Distance B (cm)

Your Surface Area is
Cm²

### Surface area | Octagon Area = (AxB) x0.5 x8
Distance A (cm)
Distance B (cm)

Your Surface Area is
Cm²

### Surface area | Trapezoid 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

##### Related Fishkeeping Content

Helping Fishkeepers With Their Fishkeeping Needs Since 2006