Bathroom Mirror Size Calculator

The Bathroom Mirror Size Calculator determines ideal mirror dimensions based on sink measurements, ceiling height, decorative style and desired shape. Enter vanity width, sink height and select format (rectangular, round, oval, square) to receive precise width, height and positioning recommendations. Considers factors like sink type (single or double), frame presence and light fixture to ensure functionality, aesthetic harmony and adequate lighting in the space.

Updated at: 06/18/2025
Centimeters
Centimeters
Centimeters
Optional - Centimeters

How to Calculate the Ideal Bathroom Mirror Size

The Bathroom Mirror Size Calculator is a practical tool designed to help you determine the perfect mirror dimensions based on your sink measurements, ceiling height, decorative style, and desired shape. By entering the vanity width, sink height, and selecting the mirror format (rectangular, round, oval, or square), you receive precise recommendations for mirror width, height, and optimal positioning.

This calculator also factors in elements such as sink type (single or double), frame presence, and lighting fixture height to ensure functionality, aesthetic harmony, and adequate lighting in your bathroom space.

How the Bathroom Mirror Size Calculator Works

The calculator uses essential parameters to recommend mirror dimensions that fit your bathroom perfectly:

  • Vanity width: The mirror width should be between 70% and 95% of the vanity width for balanced proportions.

  • Mirror height: Typically ranges between 40 cm and 100 cm, adjusted according to ceiling height and space.

  • Placement above sink: The mirror should be positioned 15 cm to 25 cm above the sink, avoiding conflict with light fixtures.

  • Mirror shape: The selected shape affects both the style and functionality of the mirror.

Practical Example

Consider a bathroom with the following measurements:

  • Vanity width: 32 cm

  • Ceiling height: 98 cm

  • Sink height from floor: 33 cm

  • Light fixture height: 79 cm (optional)

  • Mirror shape: rectangular

  • Sink type: single

  • Style: modern

  • Frame: no frame

Based on these inputs, the calculator recommends:

Item Value
Recommended width 24.0 cm
Recommended height 40.0 cm
Width range 22.4 cm to 32.0 cm
Height range 40.0 cm to 110.0 cm
Distance from sink 15 to 25 cm above
Style recommendation Modern
Positioning note 15 cm above sink, adjust to avoid light fixture

Design Principles and Proportion Guide

  • Mirror width should be 70% to 95% of the vanity width to maintain visual balance.

  • Mirror height typically ranges from 40 cm to 100 cm depending on available space and ceiling height.

  • Position the mirror 15 to 25 cm above the sink for optimal functionality.

  • Consider light fixture height to avoid interference with the mirror.

Shape-Specific Tips

  • Rectangular mirrors are the most versatile and ideal for long vanities.

  • Adding a frame increases the overall dimensions by 5 to 10 cm.

  • Round and oval mirrors provide softer aesthetics but may cover less wall space.

Installation Tips

  • Mark the mirror position with tape before drilling to ensure accuracy.

  • Use appropriate screws and anchors based on wall type (drywall, masonry, etc.).

  • Check for plumbing and wiring before drilling holes.

  • For heavy mirrors, use expansion anchors for added security.

  • Consider installing side lighting to enhance functionality and visual appeal.

Why Use the Bathroom Mirror Size Calculator?

Using this calculator ensures your mirror is proportionate to your vanity and bathroom space, avoiding common mistakes like selecting a mirror that’s too small or too large, which can disrupt both aesthetics and usability.

Summary of the Calculation

Parameter Value
Vanity width 32 cm
Ceiling height 98 cm
Sink height from floor 33 cm
Light fixture height 79 cm
Recommended mirror width 24.0 cm
Recommended mirror height 40.0 cm
Mirror distance above sink 15-25 cm
Mirror shape Rectangular