Caulk & Sealant Calculator

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Construction

Calculate how many tubes of caulk or sealant you need for a given joint length.

Formula

Volume (cu in) = length (in) × width × depth; Tubes = ⌈volume / tube_volume⌉
  • 1 fl oz = 1.80469 cu in. Standard 10.3 oz tube = ~18.6 cu in.
  • For a 3/8×1/4 in joint, a 10.3 oz tube covers ~166 linear feet.
  • Add 10% for overlap at ends and partial beads.

50 ft joint, 3/8 in wide, 1/4 in deep, 10.3 oz tube

Inputs
  • Total Joint Length: 50 ft
  • Joint Width: 0.375 in
  • Joint Depth: 0.25 in
  • Tube Size: 10.3

Volume = 600 × 0.375 × 0.25 = 56.25 cu in. 10.3 oz tube = 18.6 cu in → 4 tubes.

Frequently asked questions

What depth should caulk be applied?
Ideal caulk bead depth = width/2. For a 3/8 in wide joint, fill to 3/16 in depth. Deep joints should use backer rod to control depth and save sealant.