Posted by Mason Shaver
on July 17, 2026
Buying a mirror sounds simple until you're standing in front of your vanity trying to guess whether 24 inches is too small or 36 is too big. Get the size wrong and you'll either be staring at a sliver of your own face or covering up half the backsplash tile you just paid for.
Start with your sink width, not the wall. A single vanity with one sink usually wants a mirror somewhere between 24 and 32 inches wide. Go much wider and it starts to overhang the counter awkwardly. A double vanity is a different problem: two smaller mirrors centered over each sink almost always look better than one giant mirror stretched across both, unless your counter runs longer than 60 inches, in which case something like the 72" x 30" option reads as a single dramatic piece rather than two mirrors pretending to be one.
Height matters just as much as width. The center of the mirror should land roughly at eye level for the average adult using the vanity, which usually means the bottom edge sits 4 to 6 inches above the faucet. Mount it lower and tall household members end up ducking. Mount it higher and everyone's forehead is the star of the show.
Once size is settled, the lighting style is really a question of how much glow you want and where. Center-glow mirrors put light directly behind the glass at the middle, which gives even, shadow-free light across your whole face, good for makeup application or shaving. Edge-glow mirrors put a thin ring of light around the perimeter instead, which reads as more modern and architectural but throws slightly less usable light for close-up tasks. If you go back and forth between the two, a dimmable model splits the difference, since you can push it bright for grooming and dim it down for a softer ambient look at night.
For a small powder room, the compact 20" x 28" mirror is enough to do the job without dominating a room that might only be 20 square feet total. For a primary bath where two people get ready at once, look at the 55" x 36" range, and pick edge-glow if you want it to feel more like a design statement than a utility fixture.
One thing people forget: check your wall power situation before you fall in love with a specific model. Most of these mirrors need a nearby outlet or hardwired connection, so if you're retrofitting an older bathroom, confirm what's already behind the wall before you order.
Browse the full LED bathroom mirror collection to compare sizes and lighting styles side by side.
