This mirror size calculator gives you the right mirror width, gap, and hanging height for seven situations: above a console table, bathroom vanity (single or double), fireplace mantel, sofa or bed, leaning full-length floor mirror, empty wall or round mirror, and dresser. Use the inch/cm toggle to work in imperial or metric — everything runs 100% in your browser.
The two thirds rule mirror sizing band is the one most decorators agree on: a mirror over furniture should be 2/3 to 3/4 as wide as the furniture below it. So when people ask what size mirror above console table, the answer is the same formula — for example, a 36 inch mirror above 48 inch console lands exactly at the 3/4 end of the range. The usual mirror hanging height from floor guide puts the bottom of the mirror 6 to 12 inches above a console, which is exactly what how high to hang mirror above console questions converge on.
For the bath, this doubles as a bathroom mirror size calculator: this vanity mirror size guide keeps a single mirror 2 to 6 inches narrower than the vanity (inside the 70 to 90 percent band) and never wider than the cabinet — so how much smaller should mirror be than vanity? One to six inches narrower, or 70 to 90 percent of the vanity width. For a double sink, the mirror size for double vanity rule gives you two mirrors, one per sink, aligned to the sink centers. Working with a small powder room? small bathroom mirror size follows the same percentage band, just on a smaller cabinet.
Above the fireplace, the mirror above mantel size rule answers the classic how big should a mirror be over a fireplace question: 2/3 of the mantel width with a 4 to 6 inch gap above the shelf — that gap is fine for glass even with an active fire, but wooden frames need to stay clear of direct heat. The best size mirror above sofa or bed uses the same 2/3 to 3/4 band with a 6 to 10 inch gap above the sofa back or headboard. For dressers, use the 2/3 to 3/4 band with a 4 to 6 inch gap; that covers both mirror above dresser height and its sibling question, what size mirror above nightstand (a nightstand behaves like a small dresser). Want drama? The oversized mirror rule is simple: you can push past 3/4 width for a statement leaner, but never wider than the furniture it hangs over.
A mirror frame size calculator reminder applies everywhere on this page: all widths include the frame, so measure the whole mirror, not just the glass. Use the leaning mode as a leaning mirror size calculator to settle how tall should a leaning mirror be before you shop. For reflection planning, remember whatever faces the mirror is seen twice — aim it at something worth doubling.
The classic what size mirror for 60 inch console question: aim for a mirror 40 to 45 inches wide — that is 2/3 to 3/4 of the 60-inch console width (60 × 2/3 = 40 inches; 60 × 3/4 = 45 inches). Hang the bottom edge 6 to 12 inches above the table surface, and center the mirror near eye level, 57 to 60 inches from the floor. Frame width counts toward the total, so measure the mirror including its frame.
The 48 inch vanity what size mirror question comes up constantly: for a single-sink 48-inch vanity, the answer is a mirror 42 to 44 inches wide — 2 to 6 inches narrower than the vanity, which also lands inside the 70 to 90 percent band (33.6 to 43.2 inches). Never let the mirror be wider than the vanity itself. Mirror size for double vanity: use two mirrors aligned to each sink center (each sink section is about 24 inches wide, so two mirrors 16.8 to 21.6 inches wide). Hang the bottom edge 5 to 10 inches above the backsplash.
A 48-inch-wide mirror hits the 2/3 rule for a 72-inch mantel (72 × 2/3 = 48 inches) and should never be wider than the mantel itself. Leave a 4 to 6 inch gap between the top of the mantel shelf and the bottom of the mirror. Glass mirrors handle the heat fine at this distance, but keep wood or composite frames away from direct heat from an active fireplace.
A leaning mirror must be at least half your height to show you full length: someone 5 feet 8 inches (68 inches) tall needs a mirror at least 34 inches tall, which is 86.36 cm. Most full-length leaners sold are 60 to 72 inches tall (5 to 6 feet), with many retailers also offering 56 to 63 inch models. Lean the top about 3 to 4 inches off the wall and keep 16 inches clear of doors and walkways. This full length mirror height rule comes from flat-mirror optics: you only need a mirror half your height to see yourself head to toe.
Hang the center of the mirror at eye level, 57 to 60 inches from the floor (no higher than 60 inches in an entryway). For example, a 36-inch-diameter round mirror centered at 58 inches has its top edge at 76 inches and its bottom edge at 40 inches. The round mirror size for entryway walls usually runs 30 to 40 inches in diameter.
The standard rule is to keep the mirror 1 to 6 inches narrower than the vanity — so how much smaller should mirror be than vanity? For a 48-inch vanity that means 42 to 46 inches, with 42 to 44 inches the classic pick. A mirror the exact same width or slightly wider looks unbalanced because it reads as part of the cabinet instead of a separate object. The exception: modern frameless full-width mirrors intentionally run edge to edge for a seamless wall-of-mirror look.
Both follow the same width rule: 2/3 to 3/4 of the sofa width, with the bottom edge 6 to 10 inches above the sofa back. The difference is that a mirror doubles whatever it faces, so plan the reflection — aim it at light, plants, or something worth seeing twice, not at clutter or a door. Dressers use the same 2/3 to 3/4 band with the bottom edge 4 to 6 in above the dresser top. For framed artwork rules instead (57-inch center height, nail height, gallery walls), see our art hanging height calculator.
Yes, hanging a glass mirror over a fireplace is safe: the standard 4 to 6 inch gap above the mantel keeps it well clear of the heat, though wood or composite frames on an active fireplace should stay farther from direct heat. Note this tool is a decor sizing calculator — it is not the physics mirror equation (1/f = 1/do + 1/di); for optical image problems like focal length and image distance, see our mirror-equation calculator. And it does not cover TV mounting over a mantel — for that, see our TV size and viewing distance lab.
Boundary notes: this tool sizes mirrors for walls and furniture — it does not solve the physics mirror equation (1/f = 1/do + 1/di; see the mirror equation calculator), and it does not cover mounting a TV over a mantel (see the TV size and viewing distance lab). For framed artwork sizing and nail height, see the two-way sibling art hanging height calculator.
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