SettingsSettings for this calculationUS
The combined area of all windows to be filmed.
Measure each window's height x width and add them together.
Window film rolls needed
3 rolls
Roll size varies by brand and film type (insulating shrink film, static cling, solar/UV-blocking) — check your specific product's roll dimensions.
- Area to cover (with trim allowance)
- 121 sq ft
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Window Film Calculator: 3 rolls — shown in imperial, US market. The link sets both, so the result they see is the one on your screen.
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How this was calculated
Formula source(s)
- A standard window film roll (3 ft x 15 ft) covers approximately 45 sq ft, per common retail roll sizes
Inputs used
- Total Window Area
- 110 sq ft
Intermediate steps
- Area to cover (with trim allowance)
- 121 sq ft
Confidence note: Roll size varies by brand and film type (insulating shrink film, static cling, solar/UV-blocking) — check your specific product's roll dimensions.
What this calculation does not cover
- The count assumes every roll is the standard 3 ft (0.91 m) x 15 ft (4.5 m), 45 sq ft (4.2 m²) footprint. There is no input for roll size, so shrink-film kits, static cling packs and wide architectural rolls all have to be rescaled by hand against the coverage printed on the box.
- The 10% allowance is a flat margin on total area, not a cut plan. Film comes off a roll of fixed width, so a pane wider than the roll needs a seam or a wider product, and offcuts left by mismatched pane widths rarely nest across windows. Arched, bay and divided-light glazing routinely wastes far more than the allowance carries.
- This is a take-off, not a performance figure. It says nothing about U-value, solar heat gain coefficient, R-value or energy saved, and nothing about whether film is the right fix for the glass you already have.
- The area asked for is glass area. Interior shrink film is taped to the frame or surround rather than to the pane, so the area it actually covers is larger than the glass; measure the surround for that product or the roll count runs short.
- Glass compatibility is not checked. An applied film raises the risk of thermal stress cracking on some glazing, particularly tinted, thick, annealed or already coated units, and many sealed-unit warranties exclude glass carrying an applied film. Confirm the film against the glass type and the warranty before ordering.
Estimated cost — your price
This site holds no price list for this material — local prices vary too much to publish honestly. Enter your supplier's price and the result is costed with it.
Computed in your browser — nothing you enter is uploaded. Presented in US customary units and US trade terminology. Where a formula follows a published standard, that standard and its edition are cited beside it on this page; where none governs, the page says so. Local amendments override model codes — verify against the code in force where you build.
Sources checked 2026-09-02 · in the site-wide review of 2026-09-06 · v1.0.1
Regulatory standards & verification citations1
- A standard window film roll (3 ft x 15 ft) covers approximately 45 sq ft, per common retail roll sizes
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