Caulk Calculator

Calculate caulk tubes needed from linear feet and gap width.

By Konstantin Iakovlev · Updated September 2026 · Source: HomeAdvisor

ft
$

Tubes Needed

4

Total Cost

$20.00

Caulk Details

Linear Feet100.00 ft
Coverage per Tube30 ft
Tubes (10.3 oz)4
Estimated Cost$20.00

Use the Caulk Calculator above to calculate your results. Enter your values and see instant results — all calculations run in your browser.

Disclaimer: This calculator is for informational purposes only. Results are estimates from the numbers you enter and the assumptions described on this page; check them against local building codes, product specifications and current prices, and have structural, electrical or gas work designed or checked by a licensed professional.

How It Works

Buying caulk by the armful and hoping for the best wastes money; estimating the tube count up front keeps a project on budget. The same math serves a weekend DIY repair and a full job crew alike.

The estimate uses a fixed coverage for each gap width: a standard 10.3-ounce tube is taken to fill about 60 linear feet of a 1/8-inch gap, 30 feet of a 1/4-inch gap or 20 feet of a 3/8-inch gap. Those figures work out to a joint about 0.2 inch deep. The calculator divides your linear footage by that coverage and rounds up to whole tubes, with no separate waste allowance, then multiplies by the price per tube you enter.

Gap depth is the measurement people get wrong most often, and shorting it leaves you a tube or two light partway through. Application temperature matters too, since heat and cold change how the bead flows and spreads. On anything large, picking up a spare tube or two protects you against the surprises that always turn up.

Example: Sealing a Bathroom Countertop

  1. 1 You're sealing a bathroom countertop with 25 linear feet of joint, and the gap is a consistent 1/4 inch wide.
  2. 2 Enter 25 for linear feet and choose 1/4 inch. The calculator divides 25 by its 30-feet-per-tube coverage: 0.83, rounded up to 1 tube, which is $5 at the default price.
  3. 3 That coverage assumes a shallow joint. A 10.3-ounce tube holds about 18.6 cubic inches, while a joint filled 1/4 inch deep takes 25 × 12 × 0.25 × 0.25 = 18.75 cubic inches, slightly more than one tube.
  4. 4 If your joint is that deep, buy 2 tubes. Remember to check the caulk's recommended cure time before exposing it to moisture.

Source: HomeAdvisor · Last updated: September 2026

Frequently Asked Questions

How many linear feet does one tube of caulk cover?
This calculator assumes a standard 10.3-ounce tube covers about 60 linear feet of a 1/8-inch gap, 30 feet of a 1/4-inch gap and 20 feet of a 3/8-inch gap. A tube holds about 18.6 cubic inches, so coverage depends heavily on depth: a joint 1/4 inch wide and 1/4 inch deep uses a whole tube in about 25 feet.
What type of caulk should I use for bathrooms?
Use 100% silicone caulk for tubs, showers, and around sinks because it is waterproof and mold-resistant. Avoid acrylic latex caulk in wet areas as it can shrink and lose adhesion. Silicone cannot be painted, so choose a color that matches.
How often should I replace caulk?
Bathroom and kitchen caulk should be replaced every 3-5 years or whenever you see cracking, peeling, discoloration, or mold that cleaning cannot remove. Exterior caulk around windows and doors typically lasts 5-10 years before needing replacement.

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