Bathroom Mirror Size Calculator
Calculate the ideal mirror size for your bathroom based on vanity width and layout.
How to Find the Right Bathroom Mirror Size
A mirror that is too small looks lost above a vanity, while one that is too wide can feel cramped or interfere with lighting and wall space. The standard approach is to choose a mirror that is slightly narrower than the vanity or countertop beneath it. This calculator applies that rule to give you a practical size recommendation based on your vanity width and bathroom layout.
How the Mirror Size Is Calculated
The calculator uses a simple proportional method. For a standard single vanity, the recommended mirror width is typically 2 to 4 inches narrower than the vanity width on each side. This leaves enough clearance for sconces, tile, or wall space without making the mirror feel disconnected from the vanity.
For double vanities, the calculator treats each sink area separately and provides a width for each mirror. The height recommendation is based on standard mirror heights that work well above most vanities, typically between 30 and 36 inches, depending on ceiling height and backsplash depth.
Using the Calculator
- Measure your vanity width. Use the total width of the countertop or vanity cabinet.
- Select your layout. Choose single or double vanity depending on your setup.
- Enter the measurement. Input the width in inches.
- Review the recommendation. The calculator will output a suggested mirror width and height.
Example
A 60-inch double vanity with two sinks typically works best with two mirrors, each around 24 to 26 inches wide. This leaves a gap of 2 to 4 inches between the mirrors and 2 to 4 inches on each outer edge. A single 60-inch vanity would use one mirror around 52 to 56 inches wide, centered above the countertop.
Understanding the Recommendation
The output gives you a width range and a suggested height. The width range accounts for different preferences in spacing. A narrower mirror leaves more wall space for lighting or decor. A wider mirror creates a more continuous look. The height is a standard recommendation that works for most bathrooms, but you can adjust it based on your ceiling height or personal preference.
Common Mistakes
- Choosing a mirror wider than the vanity. This can look unbalanced and may extend beyond the countertop edge.
- Ignoring lighting placement. Wall sconces need space. If you plan to install sconces on either side of the mirror, factor in at least 4 to 6 inches of clearance on each side.
- Forgetting about the backsplash. A tall backsplash may require a slightly higher mirror placement, which affects the overall visual proportion.
Limitations
This calculator provides a general guideline based on standard bathroom proportions. It does not account for custom layouts, unusually tall or short ceilings, non-standard vanity depths, or specific lighting configurations. For unique spaces, consider consulting a designer or using a mockup to test proportions before purchasing.
Practical Use Cases
- Selecting a mirror for a new bathroom renovation
- Replacing an outdated or undersized mirror
- Planning mirror placement for a double vanity installation
- Determining mirror size before ordering custom framing or lighting
FAQ
Should the mirror be the same width as the vanity?
Not usually. A mirror that is the exact same width as the vanity can look tight and leave no room for lighting or wall space. Most designers recommend a mirror that is 4 to 8 inches narrower than the vanity for a single vanity setup.
What is the standard height for a bathroom mirror?
Standard bathroom mirrors are typically 30 to 36 inches tall. The exact height depends on your ceiling height, backsplash height, and personal preference. The mirror should be mounted so that it is usable for most people in the household.
How much space should be between a mirror and a sink?
There is no fixed rule, but a common guideline is to leave 4 to 6 inches between the bottom of the mirror and the top of the sink or countertop. This allows room for a backsplash and prevents water splashes from reaching the mirror frame.
Can I use one large mirror above a double vanity?
Yes, a single large mirror above a double vanity is a popular choice. In that case, the mirror width should be slightly narrower than the total vanity width, typically 4 to 8 inches less. This creates a clean, continuous look while still leaving space on the sides.