Window Tint Percentage Comparison | What Each VLT Level Looks Like

Window tint percentages refer to VLT—visible light transmission—so a 35% tint lets 35% of light through, meaning lower numbers are darker.

Choosing a window tint percentage means reading a number backward. The percentage stamped on a film isn’t “darkness” but the amount of light that actually passes through the glass-plus-film combo. A 5% film is nearly black; a 70% film is barely there. Which one you can legally install depends entirely on your state, your vehicle type, and which window you’re tinting. No federal law governs window tint, so limits vary from state to state.

Window Tint Percentage Comparison Chart

Each percentage level has a distinct look and a typical legal status. Here’s how the common values compare at a glance.

The middle ground matters. Most states set front-side limits between 25% and 70% VLT, with 35% being the most commonly cited legal figure for that position. Rear windows often allow much darker film, which is why many drivers run 20% or 15% in the back and something lighter up front.

How State Laws Shape Legal Tint Percentages

Every state writes its own window tint rules, and they rarely match each other. Front side windows are typically the most regulated position, with rear windows getting more freedom.

Real examples show just how different the rules are. Alabama allows 32% VLT on front, rear, and side windows. Arizona permits 33% up front with essentially any darkness elsewhere. Before choosing a percentage, look up your state’s exact table for your vehicle class.

Windshield tint follows separate, stricter rules. Most states restrict windshield film to a top strip above the manufacturer’s AS-1 line, or a measured band of roughly 4 to 6 inches from the top of the glass. A full windshield film is rarely legal for passenger vehicles.

Common Mistakes With Tint Percentages

The biggest error is reading the number as darkness instead of light transmission. A label reading “35%” means 35% of visible light passes through, so the glass blocks 65%. That distinction matters when you compare a film’s rating against your state’s legal VLT number.

Another frequent miss: the film’s labeled percentage isn’t the final installed value. Factory glass already blocks some light, so the combined VLT of glass plus film is lower than the film alone. If your state measures the installed result, a 35% film on dark factory glass could land you under the legal limit. Also check position-specific rules, reflectivity bans on mirror-like films, and color restrictions—some states prohibit red, amber, or blue tint entirely.

If your rear windows are dark, many jurisdictions require dual side mirrors on both front doors. Factor that in before tinting the back of a sedan or SUV.

Picking the Right Percentage for Your Car

Match the percentage to your actual priorities: glare reduction, privacy, heat rejection, or visibility. Darker film cuts glare and adds privacy but reduces how well you see out at night. The 35% level is widely treated as a workable balance—noticeable privacy, solid glare control, and still-clear outward visibility in most light.

Before any installation, confirm your state’s front-side limit and its rear-window rules, then choose a film that keeps your combined VLT legal. Medical exemptions exist in many states with different eligibility rules, so check your local process if you qualify. For a different project—like a bathroom window—you can skip the legal limits entirely; our roundup of the best bathroom window tints covers films for privacy and light control where car laws don’t apply.

Still unsure which percentage fits? Start with your state’s front-side limit as the ceiling, then use the rear windows for the darker look you want.