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Window tint calculator: glass and film VLT
Estimate how much visible light will pass through your glass and added film. Choose a state and window to read the relevant guidance beside your estimate. Use measured glass VLT and a film-only VLT value; the result is a plan, not a legal approval.
1. Choose a state and window
Keep the rule for your window beside your estimate, then try a combined VLT target you choose.
Your planning context
This description is for your reference only. It does not establish a legal vehicle class or change the rule shown. Manufacturer classification and other conditions can matter.
Loading state guidance. The full guides remain available below.
Choose a state to read the rule for this window.
Some current-source details remain unresolved. Read the verification notes in the full guide.
Important qualifications
A VLT estimate does not establish whether or where windshield film is allowed.
Medical exceptions can require approval or documentation and may have window-specific conditions. A diagnosis alone does not establish an exemption.
This is the guide’s full rule wording for the selected window. Read its qualifications and official sources; this tool does not determine compliance or recommend an exemption.
Browse all state guides ↗2. Estimate glass + film VLT
Optional: look up a vehicle model
This lookup can identify models in a small vehicle catalog. It cannot tell you the tint percentage of your car’s glass or fill in the calculator. For a VLT estimate, use a measured window reading below.
Catalog coverage: 2020–2022 Chevrolet, GMC, Buick and Cadillac. No verified vehicle-specific glass VLT values are available in this catalog.
Factory lookup needs JavaScript and its local reference file to load. You can still enter a measured glass VLT below.
Suggestions use the selected year and make. Enter the exact catalog model name; no nearest-year or similar-model substitution is made.
Enter a year, make and model to check this pilot.
No verified vehicle-specific VLT available
NHTSA vPIC model catalog ↗General GM glazing reference
GM bulletin 21-NA-152 discusses solar and privacy glass in broad terms. It does not establish the VLT of your particular vehicle year, model, trim or window. This general reference is separate from the catalog lookup and supplies no calculator value.
Read the general GM bulletin (2021 PDF) ↗Have the actual window measured, then enter its reading in Existing glass VLT below. Vehicle identification and a broad manufacturer bulletin cannot substitute for a verified specification or a meter reading. This lookup does not determine legal compliance.
Vehicle entries stay on this page. No VIN, plate, personal name or location is needed, and this lookup does not save a search history.
80% is an example, not an assumption about your vehicle.
Use the film-only VLT, not a shade name or a value already measured with sample glass. If the data sheet includes glass, ask the supplier for help before entering it.
Enter each percentage as a number from 0 to 100, such as 80 or 35. Decimal points are allowed.
The estimate appears when the calculator loads.
Estimate only. This is not a meter reading or a legal compliance determination.
Compare your estimate with a documented minimum
Unable to compare with available information
The numerical comparison needs JavaScript and source-checked rule data to load. The manual calculator remains available.
Conditions, limitations and official sources
This comparison covers added film across an entire side or rear window. Windshields, partial coverage and other installations need separate review.
Check the relevant classification before choosing.
This rule depends on the vehicle’s model year.
Try any film VLT. The result compares only estimated transmission; it does not establish full legal compliance.
3. Work backward to a film estimate
Choose your own planning target. No legal limit is selected or calculated from the state rule.
Target ÷ existing glass × 100 = film VLT
Enter a target from 0 to 100 to work backward from your existing glass VLT above.
The estimate is rounded upward to two decimal places and may put the combined estimate just above your target. It describes film-only VLT, not a shade name or a film tested on sample glass. It is not a product recommendation or legal approval. Have the finished window measured.
4. Build a window-by-window worksheet
Enter the known or measured glass VLT and the planned film-only VLT for one window. Add it to the worksheet, then repeat for the next window. A film specification that already includes sample glass is not a film-only value.
Left and right are viewed from inside the vehicle, facing forward. Each entry is a snapshot; later calculator changes do not update it.
Worksheet needs JavaScript. You can still use the state guides.
| Window | Glass VLT | Film VLT | Estimated combined | Entry |
|---|
Opens your browser’s print dialog; choose Save as PDF if available. A blank worksheet works too. Entries stay only in this page’s memory and clear on reload. No name, VIN or contact details are requested.
Planning worksheet only, not a tint certificate, meter reading or legal compliance determination. Source-checked comparison evidence is included only when it applies to the saved window and values. Leave unknown values blank; have the installed windows measured.
How to use the window tint calculator without counting glass twice
The calculator estimates how much visible light will pass through your existing glass after film is added. It needs two different inputs: the existing window’s light transmission and a film-only transmission value.
The most common mistake is entering a product figure that already includes sample glass. Multiplying that number by your glass again counts glass twice. If the specification is unclear, ask the supplier which number belongs in the calculator.
Start with the actual window
Enter a known or measured existing-glass VLT for the window you plan to tint. VLT means visible light transmission. The example value of 80% is there to illustrate the calculation; it is not a measurement of your vehicle.
If there is already film on the window, say so when asking for a reading. A meter measures the whole assembly in its path. That reading should not be described as bare-glass transmission unless the window is actually bare glass.
Check front and rear windows separately. A vehicle name does not tell you that every fitted pane has the same starting value.
Use a true film-only number
The added-film input asks how much light passes through the film itself. A shade name or a test result on reference glass may describe something different.
Manufacturer sheets can include specific test glass in their reported results. Ask whether the supplied percentage is film-only before entering it. Do not guess a film-only number by subtracting the sample glass percentage.
Our tint percentage guide explains the labels. The meter-reading guide explains why an installed window can differ from the roll’s name.
How the estimate works
Multiply existing glass VLT by film-only VLT, then divide by 100. Hypothetical 80% glass and true 35% film-only transmission give 28%: 80 × 35 ÷ 100 = 28.
This is a planning estimate, not a measurement. Actual glass, film and test conditions can affect the completed result. Have the installed window measured when a verified reading is needed.
The calculator accepts numbers from zero to 100, including decimals. The example film buttons let you try different inputs; they are not recommendations or statements about what is permitted.
Read the selected state and window guidance
Choosing a state and window puts the researched rule summary beside your estimate. Read its full qualifications and official sources. The vehicle description alone does not establish a legal class.
The optional numerical comparison works only when the tool has a documented minimum for the selected window and you have supplied the details that rule needs. It covers whole side or rear windows, not windshield permission or partial coverage. Supply the relevant class or model year when requested and confirm that the glass value is real rather than the example.
The result compares transmission only. It cannot decide every condition concerning reflectance, color, mirrors or exemptions.
Work backward from a target you choose
If you enter your own desired combined VLT, the planner divides that target by the existing glass value and multiplies by 100. The tool rounds the film estimate upward to two decimal places.
This target is your planning choice. It is not automatically selected from a state’s legal limit. The answer describes film-only transmission, not a product recommendation or permission to install it.
Keep a separate worksheet entry for each window
Add the known glass value and planned film value for one specific window, then repeat. Left and right mean the view from inside the vehicle facing forward. Each saved entry is a snapshot; changing the calculator later does not update that entry.
Print the worksheet or use your browser’s Save as PDF option. A blank worksheet is useful too. Entries remain only in the page’s memory and clear when it reloads. No name, VIN or contact details are needed.
Take the worksheet to the installer as a conversation aid. Leave unknown values blank and have the completed installation checked.
Common questions
Can the vehicle lookup supply my factory-glass percentage?
The limited 2020–2022 Chevrolet, GMC, Buick and Cadillac catalog identifies entries, but supplies no verified vehicle-specific glass VLT. The separate general GM bulletin is not a measurement of your window. The lookup does not change the manual inputs or substitute a nearby model.
Does clearing the planning choices erase my glass and film inputs?
The manual glass and film inputs stay in place when planning choices reset. The worksheet is not a saved account record; its entries clear when the page reloads.
What if the interactive tools do not load?
You can still read the full state guides and their official sources. Do not substitute an example input or a guessed legal class just to produce a calculator result.