How to Measure a Tank for a Liner

Measure the inside of your tank and record each dimension in feet and inches. Select your tank shape below, then check the extra height needed for your attachment.

Rectangular tank diagram showing inside length, width and wall height

Measuring Rectangular Tanks

Rectangular tank diagram showing inside length L, width W and wall height H — Record length, width and wall height in feet and inches.

Length (L): Measure the inside length of the tank.
Width (W): Measure the inside width of the tank.
Height (H): Measure from the tank floor to the top of the wall.

Price a Rectangular Tank Liner

Measuring Round Tanks

Round tank diagram showing inside diameter D and wall height H — Record diameter and wall height in feet and inches.

Diameter (D): Measure across the inside of the tank, through the center.
Height (H): Measure from the tank floor to the top of the wall.

Price a Round Tank Liner

Allow for the Attachment

Overlap: Add 6–12 Inches

Overlap liners normally need 6 to 12 inches of extra wall height so the material can fold over and be secured to the rim. Include this allowance in the height you enter for your quote.

Beaded: No Extra Height

Use the inside wall height. The liner bead locks into flexible track secured to the inside top perimeter of the tank. The track must be purchased and is included in the quote.

Compare beaded and overlap attachments

Measuring Custom-Shaped Tanks

Most tank liners are round or rectangular. We also have years of experience with custom shapes, including inground pool liners.

Send us a rough drawing with complete measurements. A clear, dimensioned drawing helps us discuss your liner and prepare an accurate price.

Tank liner pricing is based on the square footage of vinyl used. Online quotes are for potable white vinyl. Ask us about the current material thickness.