Bathroom Mirrors Over Vanity: A Sizing Guide

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For a mirror over a vanity, start with width. Set the mirror narrower than the vanity so it sits inside the vanity’s edges, leaving an equal margin on each side. Then check the bottom edge against the faucet and the backsplash. Among the three lit mirrors below, the LOAAO (32 in long by 24 in wide, listed), the B0B7GM91G3 (24 in by 36 in, black aluminum frame) and the Antok (36 in long by 30 in wide, 13 lb) cover three widths. The margins in the worked example are simple arithmetic, not a standard. For more on mirror styles, see the organic mirror guide.

Quick compare: the three mirrors

Sizes are as the Amazon listing gives them. We have not tested any of these mirrors.

Start with the vanity width

Measure the vanity cabinet from one side to the other, not the countertop. Then measure the wall from the vanity edge to the nearest door trim, window trim or corner. A mirror narrower than the vanity leaves a margin on each side. Choose the margin you want, then check that the mirror fits the wall without touching trim, a light fixture or a switch.

Worked example: a 36-inch vanity

Suppose the vanity is 36 in wide. A mirror centered over it leaves this margin on each side, calculated as the vanity width minus the mirror width, divided by two.

• 36 in wide mirror: (36 minus 36) divided by 2 is 0 in per side. The mirror is flush with the vanity edges.
• 30 in wide mirror: (36 minus 30) divided by 2 is 3 in per side.
• 24 in wide mirror: (36 minus 24) divided by 2 is 6 in per side.

The Antok, hung vertically, is 30 in wide and leaves 3 in per side. The LOAAO, hung vertically, is 24 in wide and leaves 6 in per side. The 24 by 36 mirror is listed as 24 in long and 36 in wide, so check the listing’s orientation before you hang it. Hung with the 36 in side across the vanity, it is flush; hung with the 24 in side across, it leaves 6 in per side.

Height: check the faucet and backsplash

The listings do not state a recommended mounting height for these mirrors. Measure the faucet spout and the top of the backsplash, then set the bottom edge of the mirror above the spout with enough room to clean the glass and the sink. Mark the level line on the wall before you drill.

Power: plug-in or hardwired

The LOAAO can be plugged in or hardwired, and its listing describes two z-bar brackets. The 24 by 36 black mirror includes a plug, and its listing says French cleats, wall anchors and screws come in the box. The Antok’s power type is not stated. If you choose a hardwired mirror and are not sure of the wiring, have a qualified electrician install it.

Light, fog and glass

All three are LED mirrors with a built-in defogger. The LOAAO lists 5 mm tempered glass and a one-hour auto-off for the defogger, plus a memory function that recalls the last setting. The 24 by 36 black mirror lists 5 mm glass, an IP54-rated LED strip and an automatic shutdown after one hour of continuous use. The Antok lists a color rendering index above 90, dimming that starts at 10 percent, and a defogger with a memory function.

Who should buy each mirror

• A vanity about 30 to 36 in wide that needs even, dimmable light: the Antok.
• A 24 in wide vanity or wall, and a black frame: the 24 by 36 black mirror.
• A vertical mirror 24 in wide with a plug-in or hardwired option and a listed three-year warranty: the LOAAO.

Who should skip a lighted mirror

Skip any mirror that would sit wider than the vanity if a door or a wall corner is close by. Skip the Antok if you need a power type you can confirm before buying, since its listing does not state one here. Skip any lighted mirror if you cannot reach the wall outlet or a wiring route for the hardwired option.

Common mistakes

• Trusting the title. The black mirror’s title reads 24 x 36, but its listing gives 24 in long and 36 in wide. Check the orientation.
• Skipping the wall check. Mark doors, trim, switches and outlets before you measure for the mirror.
• Hanging before measuring the faucet. The faucet spout sets the lowest useful edge.
• Using the wrong anchors. Match the anchors to your wall type and the mirror’s weight. The listed hardware differs by model.

Frequently asked questions

How much clearance should I leave on each side?

No single number applies to every vanity. The worked example shows what each mirror width leaves on a 36 in vanity. Choose the margin you want, then check the wall and the mounting instructions.

Can I rely on the dimensions in a product title?

Use the title for screening only, then check the listed size. The black mirror’s title says 24 x 36, while its listing says 24 in long and 36 in wide.

Do I need to anchor a lighted mirror to the wall?

Follow the mounting instructions. Hardware differs by model: the LOAAO includes z-bar brackets, and the black mirror includes French cleats, wall anchors and screws. Match the anchors to your wall type. Do not use the wall hardware for a different mirror without checking it.

Is the largest mirror always better over a vanity?

No. A mirror wider than the vanity can crowd the wall and the light fixtures, and a much narrower mirror leaves a wide gap on each side. Pick the width you want, then check the margins and the wall.

The three picks

Each card gives the facts the Amazon listing states. Where a listing does not state a fact, the card says so.

Listing details checked 15 October 2026. Prices and availability change, so confirm the current details on the Amazon page before you buy.

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