Window Tint Percentages Explained: What 5%, 20%, 35% and 50% Actually Look Like

"How dark should I go?" is the first question in every tint conversation, and the numbers make it harder than it should be: 35% sounds light, 5% sounds like nothing, and the same film looks different on two cars. Here's what the percentages actually mean, what each common shade looks like, why your car's glass changes the result — and the one thing we won't tell you, which is what's legal where you live.

Laws vary by state — check yours. Tint limits differ by state and by window (front sides, rear sides, back glass, windshield), and some states allow medical exemptions. Nothing here is legal advice. The International Window Film Association keeps a state-by-state lookup (it says itself that it's for information, not legal advice); your state DMV or state police site has the official rules.

What the percentage means

The number is VLT — visible light transmission: the share of visible light that gets through the window. AAA puts it simply: "A lower percentage means less light gets through, resulting in a darker tint." So 70% lets most light through and looks nearly clear; 5% blocks about 95% of it.

What each shade looks like

Descriptions vary by film and by the light you're standing in, so treat these as a guide, not a spec sheet. They're drawn from AAA, the International Window Film Association (IWFA) and a film manufacturer's guide (sources at the bottom).

Two things the table can't show:

• The gap isn't linear. The same manufacturer's guide notes there's "a negligible difference between 20% and 15%" from the outside, while 50% to 35% is an obvious step.
• Night is where dark film costs you. AAA says darker tints of 5 to 20 percent "can impair visibility at night and may be illegal in many areas," and AAA Connect adds that dark tint can reduce visibility "at night or in heavy rain or fog." A 2012 Virginia state study of 35% vs 50% front-window tint found lower light transmittance made it harder to see into a stopped car, especially the driver's hands.

Your glass already has a number

This is the part most people miss. Film goes on top of glass that already blocks some light, and the two multiply. A tint manufacturer's example: rear windows at 70% plus a 50% film gives 0.7 × 0.5 = 35% — darker than the number on the box. The Virginia study calls the result "multiplicative" for the same reason.

And many SUVs, trucks and vans come with dark factory privacy glass on the rear windows. A 2012 GM service bulletin for trucks and SUVs like the Tahoe, Suburban and Silverado describes privacy glass with a light transmittance of "(nominally) 20%," and a glass maker (AGC) lists privacy glass from 4.5% to 40%. So a "20% tint" on the back of an SUV can end up very dark. Worth knowing too: per XPEL, factory privacy glass "provides little to no heat or UV rejection" — it darkens, but it isn't the same as a heat-rejecting film.

That's also why the number that counts is measured on the finished window. Officers in many places carry a tint meter: Maryland's Harford County Sheriff's Office says tint is measured by the light that passes through "after the tint is applied," and Florida Highway Patrol's policy requires its meters to be accurate within plus or minus three percentage points.

The windshield is its own rule

Windshields are treated differently from side and rear glass almost everywhere. AAA: "many states restrict tinting windshields entirely, some allow a narrow strip of tint or a sticker along the top edge" — often down to the AS-1 line marked near the top of the glass. Check your state before tinting any of it.

Film type matters as much as darkness

Two films at the same percentage can perform very differently. Per Kelley Blue Book and AAA:

So if heat is the goal, a lighter ceramic film can do more than a darker dyed one — something to ask the installer about before you pick a percentage for looks.

How to choose (in this order)

1. Look up your state's limits for each window — IWFA's lookup or your DMV/state police site.
2. Check your factory glass, especially the rear windows on an SUV or truck. Ask the installer to meter it.
3. Decide what you want the film to do — privacy, heat, glare, looks — and pick the film type for that.
4. See it before you commit. Ask the shop for sample panels on your actual car, outside, and look from 10 feet away and from the driver's seat.

Previewing tint on your own car

The hardest part is still picturing it on your car. Full disclosure: we make Modscaper, which renders a mod onto a photo of your car, built to keep the same car, angle and background. Its Window Tint style applies an even dark tint to the side and rear glass and leaves the windshield clear. It shows a dark look, not a particular percentage — it can't preview the difference between, say, 20% and 35%, or tell you the VLT you'd actually get on your glass, and it won't tell you what's legal. Use it to see whether tinted glass suits the car, then pick the shade with the shop's samples and your state's rules.

Shops: on the Shop plan your shop name goes on every preview and customer link. Comparing tools first? See our roundup of AI car modification apps, or how to preview a wrap color if a wrap is next.

Try Modscaper's free demo (3 designs, no account) → modscaper.com/try

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Sources (checked October 13, 2026): AAA, 6 types of window tint to consider; AAA Connect, car window tinting guide; AAA Northeast, window tint laws; Kelley Blue Book, car window tinting; IWFA, automotive film and interactive tint laws; Rayno Window Film (manufacturer), window tint percentages; XPEL (manufacturer), window tint blog; Virginia Center for Transportation Innovation and Research for Virginia State Police, 2012 window tint study (PDF); GM service bulletin PIT3237F via NHTSA (PDF); AGC Automotive, privacy glass; Harford County Sheriff's Office, window tinting; Florida Highway Patrol, Policy 17.27, use of tint meters (PDF).