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How to Measure and Calculate Window Film for Ordering
Step-by-Step Measurement Guide
Step 1: Measure Each Window Pane
Use a tape measure to determine the width and height of the glass — measure from edge to edge of the glass only (inside the window frame, not including the frame itself). Measure in multiple places (top, middle, bottom for width; left, middle, right for height) to account for any irregularities. Record the smallest measurement for both width and height.
Step 2: Add Trim Allowance
Add 1/4 inch (6mm) to each side of both measurements. This extra allowance lets you trim the film to a perfect fit after application. So if your glass measures 36" wide × 60" tall, you would order film cut to 36.5" × 60.5".
Step 3: Choose Your Roll Width
SolarGard window film is available in four roll widths: 36 inches, 48 inches, 60 inches, and 72 inches — in 100-foot and 50-foot rolls. Choose the roll width that is closest to (but not smaller than) your widest window measurement. For windows wider than 72 inches, you will need to install the film in panels.
Step 4: Calculate How Many Linear Feet You Need
For each window, you need a piece of film equal to the window height (plus trim allowance). Add up all window heights to get your total linear feet needed from the roll.
Step 5: Account for Multiple Windows
If you have multiple windows of the same width, you can cut them all from the same roll. Total linear feet = sum of all window heights (with trim allowance) for windows that fit within your chosen roll width.
Window Film Calculator
Enter your window dimensions below to calculate how much film you need and which roll size to order.
Window 1
Note: This calculator determines roll quantity based on square footage only. Film selection does not affect the roll count — browse our full product catalog to choose your film series.
Your Film Requirement
Roll Size Guide
| Roll Width | Best For | Coverage per Roll |
|---|---|---|
| 36" × 100 ft | Windows up to 35.5" wide | 300 sq ft |
| 36" × 50 ft | Windows up to 35.5" wide | 150 sq ft |
| 48" × 100 ft | Windows up to 47.5" wide | 400 sq ft |
| 48" × 50 ft | Windows up to 47.5" wide | 200 sq ft |
| 60" × 100 ft | Windows up to 59.5" wide | 500 sq ft |
| 60" × 50 ft | Windows up to 59.5" wide | 250 sq ft |
| 72" × 100 ft | Windows up to 71.5" wide | 600 sq ft |
| 72" × 50 ft | Windows up to 71.5" wide | 300 sq ft |
Special Considerations
| Special Considerations | |
|---|---|
| Windows wider than 72 inches | Install film in vertical panels with a 1/8" overlap at the seam |
| Unusually shaped windows | Measure the widest and tallest points; treat as a rectangle for ordering purposes |
| Large commercial projects | Contact us for a custom quote — bulk pricing is available |
| Always order 10% extra for waste, mistakes, and future repairs | |
Not Sure What to Order?
Send us your window measurements and we will calculate the exact film quantity and recommend the right product for your project.
Ready to Purchase?
Order the exact amount you need — browse all window film products