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How to Calculate Tint Percentage?

Published in Window Tinting 2 mins read

The tint percentage, referring to Visible Light Transmittance (VLT), is calculated by multiplying the VLT percentage of the window tint film by the VLT percentage of the glass itself.

Here's a breakdown:

  • Understanding Visible Light Transmittance (VLT): VLT is the percentage of visible light that can pass through a material. A lower VLT indicates a darker tint.

  • The Calculation:

    1. Convert Percentages to Decimals: Divide each VLT percentage by 100.
    2. Multiply the Decimals: Multiply the decimal value of the window tint VLT by the decimal value of the glass VLT.
    3. Convert Back to Percentage: Multiply the result by 100.

  • Formula:

    Tint Percentage = (VLT of Film / 100) * (VLT of Glass / 100) * 100

    Which simplifies to:

    Tint Percentage = VLT of Film * VLT of Glass / 100

  • Example:

    Suppose you apply a 5% VLT window tint film to glass that already has an 80% VLT.

    1. Convert: 5% = 0.05 and 80% = 0.80
    2. Multiply: 0.05 * 0.80 = 0.04
    3. Convert back: 0.04 * 100 = 4%

    Therefore, the final VLT percentage of the glass with the tint applied is 4%.

  • Important Considerations:

    • Always check local regulations regarding legal tint percentages for vehicles and buildings. These laws are in place to ensure visibility and safety.
    • The VLT of the glass itself may vary depending on its type and thickness.

In summary, to find the final tint percentage, simply multiply the VLT percentages of the film and the glass and then divide by 100. This resulting percentage represents the amount of light that will pass through the window after the tint is applied.

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