Joint length + size + cartridges
Caulk Calculator
Estimate how many cartridges of caulk or sealant you need from joint length, width, filled depth, and the volume printed on the package. A round bead option covers surface seams.
Example only
- Filled volume
- 20.78 US fl oz
- With 10% extra
- 22.86 US fl oz
- Using 10.1 fl oz cartridges
- 3 whole cartridges
Your result uses your own inputs, not this example.
Measuring guide
Measure before buying
Measure total seam length and the space actually filled with sealant. Backer rod can reduce fill depth; for a round surface bead, enter bead diameter instead.
Measure your project
Add seam lengths of the same joint size. Estimate different joint sizes separately.
Read the product label
Check the cartridge volume and the sealant’s joint guidance.
Round up to packages
Review the extra allowance, then purchase whole packages for the calculated quantity.
The math
How the quantity is estimated
Rectangular joint volume = length in inches × width × filled depth. For a round bead, use π × (diameter ÷ 2)² × length. Divide cubic inches by 1.8046875 for US fluid ounces, then round up to whole cartridges.
Confirm product coverage and application instructions before ordering.
Reference
Source behind this calculator
Use the label and instructions for the exact product you purchase.
Product coverage
Joint width, depth, and package size determine sealant consumption.
Sika joint sealant consumption guide ↗