Caulk Calculator
How many tubes of caulk or sealant a job takes, from the length of the joints and the size of the bead, and how far one cartridge goes.
Result
Buy 5 packagesEstimate
Rounded up to whole packagesNo extra is added by default. Some caulk always stays in the nozzle and comes off with the tooling.
- Caulk in the joints
- 41.6 fl oz (75 in³)
- Caulk with the allowance
- 41.6 fl oz (75 in³)Estimate
- Length one package fills
- 24.3 ft (7.4 m)
https://calcgallery.com/paint-drywall/caulk-calculator/
Results are estimates for planning only. Actual needs vary with site conditions, products and workmanship. Always confirm quantities with your supplier and follow local building codes and manufacturer instructions. Read the full disclaimer
How to use the Caulk Calculator
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- Add up the length of every joint you will seal and enter it.
- Enter the bead size, then pick the package you are buying or enter its volume from the label.
- Read how many packages to buy and how far one package goes at that bead size.
How it is calculated
cross-section = width × depth (joint) = size × size ÷ 2 (corner bead) = π × (diameter ÷ 2)² (round bead)caulk = cross-section × total lengthpackages = ⌈caulk × (1 + allowance) ÷ package volume⌉length per package = package volume ÷ cross-sectionThis is the same arithmetic the makers use for their yield tables. For a 10.1 fl oz cartridge it gives 55.0 feet of a 3/16 inch round bead, where DAP’s bulletin prints 55, and 24.3 feet of a 1/4 by 1/4 inch joint, where Sika’s data sheet prints 24.3.
Package sizes
The 10.1 fl oz cartridge and the 5.5 fl oz squeeze tube are the sizes on DAP’s ALEX PLUS bulletin; the 20 fl oz sausage is Sika’s, from the Sikaflex-1A data sheet. Other products come in other sizes, so check the label and choose Other size when yours differs.
What the numbers leave out
The page assumes a bead of even size, filled flush along the whole run. A bead that is tooled into a concave curve uses a little less; gaps that widen at corners use more. It says nothing about which sealant suits a joint, or how wide a joint must be for the movement it takes: the sealant’s data sheet sets both.
With your numbers
- Caulk = bead cross-section × 100 ft = 41.56 fl oz
- One package fills 24.3 ft of this bead
- Packages = ⌈41.56 fl oz ÷ one package⌉ = 5
Quick reference
No extra is added by default. Some caulk always stays in the nozzle and comes off with the tooling.
| Job | Packages to buy |
|---|---|
| 100 ft of 1/4 × 1/4 in joint | 5 |
| 60 ft of 3/16 in round bead | 2 |
| 80 ft of 3/8 in corner bead | 4 |
| 50 ft of 1/2 × 1/2 in, sausages | 5 |
| 30 m of 6 × 6 mm joint | 4 |
| 30 m of 6 × 6 mm, 310 mL tubes | 4 |
Where the numbers come from
The fixed figures this calculator relies on, and the published source each one was checked against. How the calculators are built and checked
3 sources
DAP ALEX PLUS All Purpose Acrylic Latex Caulk Plus Silicone, technical bulletin revised 1/29/16: "Packaging: 10.1 fl. oz. (300 mL) cartridge", https://pdf.lowes.com/productdocuments/d3706af2-2382-4ccd-95b3-2704596a1df0/65369938.pdf; Sikaflex-1A product data sheet, October 2025, version 01.09: "10.1 fl. oz. (300 ml) cartridge", https://usa.sika.com/dam/dms/us01/q/sikaflex_-1a.pdf
Used for
- A standard caulk cartridge: 10.1 US fl oz, labelled 300 mL (10.1 fl oz is 298.7 mL).
Sikaflex-1A product data sheet, October 2025, version 01.09, Packaging: "20 fl. oz. (600 ml) sausage", https://usa.sika.com/dam/dms/us01/q/sikaflex_-1a.pdf
Used for
- A sealant sausage pack: 20 US fl oz, labelled 600 mL.
DAP ALEX PLUS All Purpose Acrylic Latex Caulk Plus Silicone, technical bulletin revised 1/29/16: "5.5 fl. oz. (162 mL) squeeze tube", https://pdf.lowes.com/productdocuments/d3706af2-2382-4ccd-95b3-2704596a1df0/65369938.pdf
Used for
- A caulk squeeze tube: 5.5 US fl oz, labelled 162 mL.
Common questions about the Caulk Calculator
- How many tubes of caulk do I need?
- Five 10.1 fl oz cartridges for 100 feet of joint 1/4 inch wide and 1/4 inch deep, with no extra added. The joint holds 100 ft × 12 × 1/4 in × 1/4 in = 75 cubic inches, which is 41.6 fl oz, and one cartridge fills about 24.3 feet of it, so 41.6 ÷ 10.1 = 4.1 rounds up to 5. For 30 m of a 6 by 6 mm joint it is 1,080 mL, four 300 mL cartridges.
- How many feet does a tube of caulk cover?
- It depends entirely on the bead. A 10.1 fl oz cartridge holds about 18.2 cubic inches, which lays about 55 feet of a 3/16 inch round bead, the figure DAP prints on ALEX PLUS, but only about 24 feet of a joint 1/4 inch wide and 1/4 inch deep, and about 6 feet of a 1/2 by 1/2 inch joint. Doubling the width and the depth uses four times the caulk.
- How do I measure the joint depth?
- Push a thin ruler or a toothpick into the gap. If a backer rod is already in, measure down to the rod, because the caulk stops there. A deep gap with no rod takes far more caulk than a surface bead and usually cures poorly, which is why sealant makers ask for backer rod in deep joints.
- Is a 10.1 oz tube the same as a 300 mL tube?
- Nearly. The US cartridge is 10.1 US fluid ounces, which is 298.7 mL, and makers print 300 mL beside it. Many cartridges sold in metric markets hold 290 or 310 mL; choose Other size and enter the figure on yours.
- How many tubes of caulk for a bathroom or a room of trim?
- Measure rather than guess. The three walled sides of a 60 by 30 inch tub are 150 inches, 12.5 feet. The top edge of the baseboard in a 12 by 12 foot room is 48 feet, less the doorways. Add the runs, choose the bead you will lay and the page does the rest.