Window Tint
VLT Calculator
More Accurate
Estimates
Better Customer
Conversations
Fewer
Surprises
90%
90%1%
78%
1%
GLASS VLT
Unfilmed Glass
NET VLT31.1%What you’ll see through the glass
90%
90%1%
40%
1%
FILM VLT
Published VLT
NET VLT 27.2% What you'll see through the glass

1. Unfilmed Glass VLT

Select the visible light
transmission of your unfilmed glass.

Quick Select (Common Automotive Glass)

2. Published Film VLT

Select the manufacturer's
published VLT for the film.

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)

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.