How do I calculate how much caulk I need?

To calculate caulk needed: multiply joint width × depth × length to get volume, add 20% for waste, then divide by cartridge size (typically 10.1oz or 300ml). For example: 0.5 inch × 0.5 inch × 100 feet = 25 cubic inches = about 410ml. With 20% waste = 492ml, so you need 2 tubes of 10.1oz caulk.

What is the typical waste factor for caulking?

The typical waste factor for caulking is 10-20%. Most professionals use 20% to account for material left in the tube and nozzle, overfilling joints, cleanup waste, and any rework needed. This ensures you have enough material to complete the job.

How many linear feet does one tube of caulk cover?

One 10.1oz tube of caulk covers different lengths depending on joint size. For a 1/4 inch × 1/4 inch joint: approximately 48 linear feet. For a 1/2 inch × 1/2 inch joint: approximately 12 linear feet. For a 3/8 inch × 3/8 inch joint: approximately 21 linear feet. These estimates include 20% waste factor.

Caulk Calculator

Total Length (feet)

Joint Width (inches)

Joint Depth (inches)

*Based on 10.1oz cartridges with 20% waste factor.
*Results are estimates. Actual usage may vary.