Enter your Window Tint VLT (%) and Original Glass VLT (%) — or pick from the Common Film VLT and Common Glass VLT presets — and this Window Tint Percentage Calculator gives you the Final Tint Percentage, how much Light is Blocked, and your overall Darkness Level so you know exactly what you're putting on your windows before committing.
Final Tint Percentage
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Light Blocked
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Darkness Level
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VLT (Visible Light Transmission) measures how much visible light passes through glass or tint film. A lower VLT percentage means darker tint. When combining tint film with original glass, the final VLT is calculated by multiplying both percentages together.
35% tint provides moderate privacy and heat reduction while maintaining good visibility. It's legal in most states for rear windows and offers a good balance between privacy and safety for daytime and nighttime driving.
20% tint allows 20% of light through, providing significant privacy while still allowing reasonable visibility. 5% tint (limo tint) is much darker, blocking 95% of light and providing maximum privacy but severely limiting visibility, especially at night.
Yes, you can layer tint films, and this calculator helps determine the final result. However, layering may cause bubbling, adhesion issues, or legal problems. It's better to use a single film with the desired darkness level.
You can measure current tint percentage using a VLT meter, which measures how much light passes through the window. Many tint shops offer free VLT testing, or you can purchase a handheld VLT meter for around $100-200.
Legal tint limits vary by state, but commonly front side windows must allow 70% or more light transmission, while rear windows can be darker. Always check your local laws before tinting, as violations can result in fines and required removal.
Yes, original glass VLT significantly impacts the final result. Most factory glass transmits 70-90% of light. When you apply tint, the final darkness is the tint VLT multiplied by the glass VLT, which is why this calculator is essential for accurate results.
To calculate manually, use this formula: Final VLT = (Tint VLT ÷ 100) × (Glass VLT ÷ 100) × 100. For example, 35% tint on 75% glass equals (35÷100) × (75÷100) × 100 = 26.25% final VLT.