Weatherstripping Calculator

Calculate weatherstripping material for doors and windows with energy savings estimate.

By Konstantin Iakovlev · Updated September 2026 · Source: ENERGY STAR — Seal and Insulate

$

Linear Feet

147 ft

Rolls Needed

9

Material Cost

$72.00

Weatherstrip Details

Door Stripping51 ft
Window Stripping96 ft
Total Linear Feet147 ft
Rolls Needed9
Material Cost$72.00
Est. Annual Energy Savings$100.00 – $200.00

Use the Weatherstripping 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

Sealing the air leaks around doors and windows is one of the cheapest ways to cut a utility bill, and this tool sizes the weatherstripping you need while estimating what tighter seals save you. Closing those gaps pays back in both dollars and a smaller carbon footprint. Homeowners and builders can use the numbers to decide where sealing is worth the effort.

Material estimates use standard lengths rather than your measurements: 17 feet of stripping per door and 12 feet per window, sold in 17-foot rolls at the cost per roll you enter ($8 by default), with the roll count rounded up. The annual savings line is a rough whole-home range rather than a figure computed from your doors and windows. ENERGY STAR estimates that air sealing and adding insulation together save an average of 15% on heating and cooling costs (11% of total energy costs), and it lists weatherstripping doors as one of the simple fixes.

Round every measurement up to the nearest inch so you never come up short. The detail people miss is the thickness of the stripping itself: ignore it and the seal either fails or binds the door shut. Match the material to your climate as well, because cheap foam and dense rubber hold up very differently against wear and swings in temperature.

Example: Sealing a Drafty Entry Door

  1. 1 Input: 1 door, 0 windows, $8 per roll.
  2. 2 Length: the calculator allows 17 feet per door, enough for the head and both jambs of a standard 36 x 80 inch door (3 + 6.67 + 6.67 = 16.3 feet). The threshold gap needs a door sweep, which is a separate item.
  3. 3 Rolls: 17 / 17 = 1 roll, so the material cost is $8.00.
  4. 4 Savings: the $100-$200 a year the calculator shows is its whole-home range and does not scale with what you enter, so a single door will account for only part of it. ENERGY STAR puts the savings from sealing air leaks and adding insulation across the house at up to 10% of annual energy bills.

Source: ENERGY STAR — Seal and Insulate · Last updated: September 2026

Frequently Asked Questions

How much can weatherstripping save on energy bills?
ENERGY STAR estimates that air sealing and adding insulation save an average of 15% on heating and cooling costs (11% of total energy costs). Weatherstripping doors and caulking windows are the simple fixes it lists, and sealing attic leaks and adding insulation are the bigger ones. The calculator's $100-$200 a year is a rough whole-home range, not a figure computed from the doors and windows you enter.
What type of weatherstripping is best for doors?
V-strip (tension seal) and foam tape are good for door frames. A door sweep or automatic door bottom seals the gap at the threshold. For exterior doors, adhesive-backed rubber or silicone weatherstripping is the most durable option.
How often should I replace weatherstripping?
Inspect weatherstripping annually. Foam tape lasts 1-3 years, rubber and vinyl 3-5 years, and metal or silicone types 5-10 years. Replace whenever you feel drafts, see daylight around closed doors, or notice the material is compressed, cracked, or peeling.

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