Window film calculator: film area, panes and rolls
One row per pane size: its width, height and how many identical panes. The calculation gives the film area, the large panes to check before installing and, from your roll size, an estimate of the rolls. In metric or imperial.
Film and glass: when to check before installing (reference)
Solar film heats the glass. The trade's guides ask for a film-to-glass review in these cases, as read:
| What the sources say | |
|---|---|
| Large panes | Over 40 sq ft (3.7 m²) for a sealed double pane and 100 sq ft (9.3 m²) for a single annealed pane, by default |
| Thick or tinted glass, rigid frames, exterior shading | The film maker's glass checklist is required |
| Low-e glass | Never apply film over a low-e coating on face 4 |
| Tempered or annealed | No tempered mark: presume annealed glass |
Sources: IWFA, advanced solar guide; 3M, glass checklist; Pilkington ATS-113; SunTek, film-to-glass guide
Rolls and cutting (reference)
The trade's figures, cited as a guide: your roll and your cut stay yours.
| What the sources say | |
|---|---|
| Rolls | 36 to 72 in (91 to 183 cm) wide by 100 ft (30.5 m) |
| Cutting | Each piece cut about 1 in larger than the glass in both directions, then trimmed in place |
| Edge | An edge gap of about 1/32 to 1/16 in, up to 1/8 in for thick safety film |
| Splices | Allowed when the glass is wider than the roll |
Sources: IWFA, safety and security guide; 3M, flat glass installation; IWFA, visual inspection
How it is calculated
Pane area = width x height; film area = area x identical panes, added up over every row. A pane over 40 sq ft (3.7 m²) is counted to check: the film maker's film-to-glass review comes before installing. Rolls = film area x (1 + waste) / (roll width x roll length), rounded up to the roll: an estimate, the real cut depends on how the pieces are laid out. No roll width or waste comes filled in: they are yours.
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