Please read the following before calculating:

• For bowfront tanks, please measure width at the widest point.
  Because of differences in bow, this caculation may be a little inaccurate.
• For hex tanks, please measure length as the distance from the two corners that are furthest apart.
  Please measure width as the distance from flat side to opposite flat side - perpendicular to the corners measured for length.
• For corner tanks, please measure one of the flat sides of the tank as length. No width is required.
• For half cylinder tanks, fill in the length as the back side of the tank. No width is required.