Caulk Calculator — How Many Tubes Do You Need?
Work out how many tubes of caulk a job needs. Enter the total length of joints and the bead size, and this calculator gives you the tube count for a standard 10 oz cartridge.
How to use this calculator
- Add up the total length of all the joints, gaps, and seams you plan to seal, in feet.
- Choose the bead size — a thin 1/8 in bead goes much further than a wide 1/2 in bead.
- Coverage figures are for a standard 10 oz cartridge; larger 28 oz sausages cover roughly 3× as much.
- Buy an extra tube — the first inch or two of each tube is often wasted priming the nozzle.
The formula
Caulk coverage is a length, set by the bead diameter you lay.
Tubes = total joint length ÷ coverage per tube. A 10 oz tube runs about 55 ft at a 1/8 in bead, ~26 ft at 1/4 in, and only ~7 ft at a 1/2 in bead.
Round up, and add one spare tube for nozzle priming and waste.
Worked example
50 ft of joints sealed with a 1/4 in bead.
Coverage ≈ 26 ft per 10 oz tubeTubes = 50 ÷ 26 = 1.9 → 2 tubes
You need about 2 tubes of caulk for 50 ft of 1/4 in joints.
Frequently asked questions
How many feet does a tube of caulk cover?
A standard 10 oz tube covers about 26 feet at a 1/4 inch bead. A thinner 1/8 inch bead nearly doubles that, while a 1/2 inch bead drops it to around 7 feet.
What size caulk bead should I use?
Match the bead to the gap: 1/8 inch for fine trim and tile seams, 1/4 inch for most baseboard and window joints, and 3/8–1/2 inch only for large gaps (where backer rod first is better).
How much more does a 28 oz sausage cover?
A 28 oz sausage pack holds roughly three times a 10 oz tube, so it covers about 3× the length for the same bead size — handy for big jobs.