Bathroom Mirror Size Calculator
Enter your vanity measurements to get mirror width and height suggestions plus spacing tips for lighting and faucets.
Mirror width
42" – 45"
Mirror height & clearances
Height ≈ 43"
Bottom clearance 12"
Top clearance 5"
Lighting & notes
Space side sconces roughly 51 inches apart.
Leave at least three inches of wall space on each side so frames do not crowd trim or lighting.
How to Use This Calculator
Measure the vanity and ceiling
Record the total countertop width, ceiling height, and counter height to understand available wall space.
Account for faucet and lighting
Measure the faucet spout height and the clearance you need below vanity lights or sconces.
Review the recommended size
Use the width range and height suggestion to choose a ready-made mirror or specify custom glass dimensions.
Formula
Mirror width ≈ Vanity width – (2 × side clearance)
Mirror height ≈ Ceiling height – Counter height – Faucet clearance – Lighting clearance
Example: 48 inch vanity, framed mirror, 36 inch counter, 10 inch faucet, 5 inch lighting clearance → Mirror width about 42 to 44 inches, height about 36 inches.
Full Description
A well-proportioned bathroom mirror balances the vanity, lighting, and fixtures. This calculator provides quick sizing guidance for single and double vanities, covering framed, frameless, and medicine cabinet styles.
Adjust the inputs to see how faucet height or lighting clearance affects mirror height, then take the recommendations to your showroom or glass fabricator.
The tool also hints at sconce spacing and installation notes so you can plan wiring and mounting hardware before tiling.
Frequently Asked Questions
How wide should a bathroom mirror be?
Single mirrors typically stop 2 to 6 inches inside the vanity edges. For double sinks, each mirror spans the sink width plus a few inches of surrounding counter.
How high should I hang the mirror?
Keep the bottom edge a couple of inches above the faucet and center the mirror around 60 inches off the floor for comfortable viewing.
Can the mirror touch the backsplash?
Allow a small gap (about a quarter inch) so the mirror does not trap moisture or rest on uneven tile.
Do I need special anchors?
Use hardware rated for the mirror weight and moisture. Drill tile carefully using masonry bits and seal fasteners to prevent corrosion.