Window Tint Percentage Calculator

VLT, or Visible Light Transmission, is the percentage of light that passes through your car's window after tinting — and combining your film's VLT with your glass's VLT gives you the true darkness of the finished window. Enter your Window Tint VLT (%) and Original Glass VLT (%) into the Window Tint Percentage Calculator — or pick from the quick presets for common films and glass types — to see your Final Tint Percentage, Light Blocked, and overall Darkness Level.

%

VLT percentage of the tint film you want to apply

%

VLT percentage of your vehicle's original glass

Quick preset values for common tint films

Quick preset values for common glass types

Results

Final Tint Percentage

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Light Blocked

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Darkness Level

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Frequently Asked Questions

What is VLT and how does it affect tint percentage?

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.

Is 35% tint dark enough for privacy?

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.

What's the difference between 20% and 5% tint?

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.

Can I layer tint films to achieve a darker effect?

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.

How do I know my current tint percentage?

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.

What are the legal tint limits in most states?

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.

Does the original glass VLT affect my final tint percentage?

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.

How to calculate tint percentage manually?

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.