Joint Sealant Calculator

Sealant volume from joint width, depth, and linear footage.

Joint width (inches)

Joint depth (inches)

Total linear feet

Use backer rod (0=no, 1=yes)

Sealant (1=PU, 2=silicone, 3=poly, 4=hybrid)

Waste factor (%)

Tab to move between fields

Sealant volume (cu in)

345

Cartridges (10.1 oz)20

Sausage packs (20 oz)10

Backer rod diameter (in)0.63

Backer rod (linear ft)210

Width-to-depth ratio2

Max movement (inches)0.13

Estimated cost ($)$175.50

How to Use This Calculator

Enter Joint Width (inches) — measure at the widest point, as joints are typically tapered.
Set Joint Depth (inches): ideal depth is half the joint width for proper hourglass shape and movement.
Enter Total Linear Feet of joints to be sealed on the project.
Set Use Backer Rod to 1 for joints wider than 1/4 inch — backer rod controls depth and provides a bond breaker.
Select Sealant Type and Waste Factor (%) based on joint geometry and application method.
Review Cartridges (10.1 oz) or Sausage Packs (20 oz) needed, Backer Rod footage, and Estimated Cost for procurement.

How the result changes with Joint width (inches)

Joint width (inches): Width of the joint to be sealed. Measure the gap at its widest point.
Joint depth (inches): Depth of sealant in the joint. Ideal depth is half the width.
Total linear feet: Total linear footage of joints to be sealed.
Use backer rod (0=no, 1=yes): Backer rod controls depth and provides a bond-breaker. Recommended for joints wider than 1/4 inch.
Sealant (1=PU, 2=silicone, 3=poly, 4=hybrid): 1 = Polyurethane (+/-25%). 2 = Silicone (+/-50%). 3 = Polysulfide (+/-25%). 4 = Hybrid/MS polymer (+/-35%).
Waste factor (%): Material waste from tooling, gun waste, and cleanup. 10-20% is typical.

Sealant volume (cu in): Total sealant volume including waste factor.
Cartridges (10.1 oz): Standard 10.1 oz caulk cartridges needed.
Sausage packs (20 oz): 20 oz sausage packs needed (more efficient for large jobs).
Backer rod diameter (in): Recommended backer rod diameter (25% larger than joint width).
Backer rod (linear ft): Linear feet of backer rod including 5% extra.
Width-to-depth ratio: Joint geometry ratio. Ideal is 2:1 for optimal sealant performance.
Max movement (inches): Maximum joint movement the sealant can accommodate.
Estimated cost ($): Sealant, backer rod, and primer material cost.

Identify Input Parameters
4 parameters
Joint width (inches) = 0.5, Joint depth (inches) = 0.25, Total linear feet = 200, Use backer rod (0=no, 1=yes) = 1 = 6 input(s) provided
Calculate Sealant volume
Sealant volume = netVolumeCuIn * (1 + wastePct / 100)
345 = 345
Calculate Cartridges
Cartridges = ceil(volumeWithWaste / cuInPerCartridge)
20 = 20
Calculate Sausage packs
Sausage packs = ceil(volumeWithWaste / cuInPerSausage)
10 = 10