Caulk & Sealant Calculator
How many tubes of caulk or sealant do you need? Estimate volume from the joint dimensions, then round up to whole containers.
Rectangular joint model only. Quantity estimate, not joint-design or product-suitability advice. Container sizes below use US fluid ounces, not ounces by weight.
Your sealant estimate
tubes / containers to buy
- Theoretical joint volume
- cu in
- Sealant needed before waste
- fl oz
- Sealant needed including waste
- fl oz
- Exact tubes required
- tubes
- Purchased container volume
- fl oz
- Estimated unused capacity after allowance
- fl oz
Whole tubes use unrounded required volume. Even a small amount over a whole-container boundary requires another tube. Unused capacity is purchased volume minus the amount reserved including waste, not a prediction of recoverable leftover sealant.
Material cost
estimated purchase cost
Coverage per tube / container
- Theoretical coverage before waste
- linear ft
- Planning coverage with entered waste
- linear ft
Coverage is calculated from joint geometry and container volume. Actual field coverage can vary with joint shape, tooling, surface conditions and product/application losses. This is not guaranteed manufacturer coverage.
Shopping summary
How it works
Length in feet × 12 × width in inches × depth in inches gives rectangular joint volume in cubic inches. One US fluid ounce equals 1.8046875 cubic inches. Add the entered waste allowance once, divide by container volume, then round up to whole containers. Coverage before waste divides one container's volume by the joint cross-section; planning coverage also accounts for the allowance.
Understanding the estimate
Actual usage may vary with irregular joint dimensions, bead/joint shape, material left in the cartridge or nozzle, tooling loss, surface texture, gaps/voids, application technique and product behavior. The model assumes a uniform rectangular cross-section; triangular beads and fillets are not modeled.
Choose the joint design and product separately
This calculator does not determine sealant chemistry, structural suitability, expansion-joint requirements, backer-rod requirements or manufacturer maximum/minimum joint dimensions. Do not assume an arbitrarily deep joint should be completely filled with sealant. Deep joints may require backer rod or a manufacturer-specified design. Follow the selected sealant manufacturer's instructions.