Window Tint
VLT Calculator
NET VLT 27.2% What you'll see through the glass

1. Unfilmed Glass VLT

Select the visible light
transmission of your unfilmed glass.

70%
90%Lighter 1%Darker
Quick Select (Common Automotive Glass)

2. Published Film VLT

Select the manufacturer's
published VLT for the film.

35%
90%Lighter 1%Darker
Quick Select (Common Film VLT)
Results
Simple Multiplication
(Incorrect)
24.5%
(Glass VLT x Film VLT)
Correct Estimate
(Use This Number)
27.2%
(Glass VLT x Film VLT / 0.90)
Difference
+2.7%

Why Divide by 0.90?

Published film VLT values are measured on a nominal 90% clear glass standard. That reference glass contributes its own visible-light loss. Dividing by 0.90 removes that reference-glass contribution and gives a better estimate of installed VLT on real automotive glass.

Installed VLT = Glass VLT x Film VLT / 0.90

Quick Reference: Net VLT (Corrected)

Common glass VLT values across the top and film VLT values down the side.

Download PDF
Film VLT ↓ / Glass VLT →

Estimated values only. Actual glass and film VLT can vary from published nominal values, manufacturing tolerances, installation conditions, and meter accuracy. Verify applicable window-tint laws and enforcement requirements independently.