Calculate tint percentage (final VLT) when you add window film over clear or factory tinted glass, or find the film VLT needed to reach a target tint.
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VLT Level Reference
Higher VLT means more visible light transmitted. This table is a qualitative appearance guide, not a compliance chart. Appearance and privacy depend on lighting and the actual installation. Check current official rules for the jurisdiction, vehicle class, window position, reflectance, and any exemption; VLT alone does not establish legal compliance.
| Net VLT | Appearance | Compliance check | Privacy Level |
|---|---|---|---|
| 70% | Nearly clear | Verify current official rules for this window | None |
| 50% | Light tint | Verify current official rules for this window | Low |
| 35% | Medium tint | Verify current official rules for this window | Moderate |
| 20% | Dark tint | Verify current official rules for this window | High |
| 5% | Limo tint | Verify current official rules for this window | Maximum |
Tint Percentage Formula
For two film layers, estimated final VLT (%) = glass VLT * film 1 VLT * film 2 VLT / 10,000. To solve for one film layer, required film VLT (%) = target final VLT / glass VLT * 100. All active percentages must be between 0% and 100%; a target above the starting glass is impossible in this model. With 0% glass and a 0% target there is no unique film answer; a positive target with 0% glass is impossible. A layer can reduce or preserve transmission, including the 0% and 100% equality cases. The nearest sample from 5%, 15%, 20%, 35%, 50%, and 70% is illustrative, may miss the target, and is not a legal recommendation.
- TP = estimated final visible-light transmittance (%) in the simplified multiplication model
- VLTt = film-only visible-light transmittance (%). Some manufacturer data already includes specified test glass; do not multiply that combined rating by the glass VLT again. A product shade name is not necessarily its film-only VLT.
- VLTg = measured or manufacturer-specified transmittance of the actual starting glass (%). Verify installed glass-and-film VLT with a suitable measurement rather than treating this estimate as certification.
Starting Glass VLT by Window Position
Choose a typical starting glass, or pick Custom glass VLT and enter a measured or manufacturer value. Glass transmission varies by vehicle, trim, and window, so a measured value is more exact. In the simplified model, 20% glass and a separate 35% film-only VLT give an estimated 7% final VLT. This arithmetic example does not establish legality.
| Window Position | Starting VLT | Notes |
|---|---|---|
| Windshield | Measure the actual glass or use its manufacturer data | Use data for the area being evaluated; bands and treatments may differ |
| Front side windows | Measure the actual glass or use its manufacturer data | Verify the current rules for this window and vehicle |
| Rear side windows (privacy glass) | Measure the actual glass or use its manufacturer data | Existing privacy glass is part of the starting transmission and must not be counted twice |
| Rear windshield | Measure the actual glass or use its manufacturer data | Vehicle trim and installed glass affect the starting value |
Film Technology and Heat Rejection
VLT describes visible light transmission. It does not determine ultraviolet rejection, infrared rejection, or total solar energy rejection, which are separate performance measures. Films with the same VLT can have different tested solar performance. Compare product-specific data measured on stated glass and wavelength ranges; generic film categories do not establish a universal IR, UV, signal, or durability rating.
| Film Type | IR Rejection | UV Rejection | Signal Compatibility | Durability |
|---|---|---|---|---|
| Dyed | Compare tested product data and wavelength range | Use the product specification | Verify with the product and vehicle manufacturer | Check tested performance, care requirements, and warranty |
| Metalized | Compare tested product data and wavelength range | Use the product specification | Verify with the product and vehicle manufacturer | Check tested performance, care requirements, and warranty |
| Carbon | Compare tested product data and wavelength range | Use the product specification | Verify with the product and vehicle manufacturer | Check tested performance, care requirements, and warranty |
| Ceramic | Compare tested product data and wavelength range | Use the product specification | Verify with the product and vehicle manufacturer | Check tested performance, care requirements, and warranty |
