Bathroom Mirror Size Calculator

Your details

The full width of your vanity or sink cabinet, measured edge to edge.
in
Floor to ceiling height in the bathroom. Standard US ceilings are 96 in / 244 cm.
in
Height from the floor to the top of the vanity counter. Standard is 32-36 in / 81-91 cm.
in
Height of the tallest faucet above the counter top. The mirror bottom edge clears this.
in
Clearance between the top of the mirror and the ceiling or any overhead light fixture. 4-8 in / 10-20 cm is typical.
in
If you have or plan to add vertical sconce lights beside the mirror, choose the spacing to reserve. The mirror width is reduced accordingly.
Recommended mirror widthMirror center above eye level
27

Ideal mirror width based on your vanity size and mirror type

Recommended mirror height47
Bottom edge from floor43
Top edge from floor90
Mirror center from floor66.5
Margin each side4.5
Unitin
Mirror width27
Mirror height47
Bottom edge from floor43
Top edge from floor90

Ideal mirror: 27.0 x 47.0 in

  • A 27.0 in wide mirror leaves 4.5 in of breathing room on each side of the vanity, which is the proportionally balanced look designers aim for.
  • The mirror center at 66.5 in is above the preferred 57-65 in eye-level zone. A shorter ceiling gap would bring it into range.
  • The mirror proportions (27.0 in wide x 47.0 in tall) give an aspect ratio of 0.57:1, which is portrait (tall) - good for smaller vanities.

Next stepCenter the mirror horizontally over the vanity basin, not just the cabinet, and use a laser level to confirm the mounting height before drilling.

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