How to Size Your Bathroom Mirror To Your Vanity

Why Bathroom Mirror Size Matters

Your bathroom mirror does more than help you get ready each morning. It shapes how the space feels. A mirror that fits well above your vanity makes your bathroom feel calm, open and complete.

But a mirror that’s too big or too small can make things look off-balance. That’s why choosing the right size matters. It helps your mirror...

• Match your vanity and sink
• Reflect enough light and space
• Look neat and balanced
• Feel right in your daily routine

Start With Your Vanity Size

Before you shop for a mirror, measure your vanity. Most vanities in Australia come in these sizes:

• 600mm – usually for smaller bathrooms
• 750mm - usually for small powder rooms
• 900mm – common in family bathrooms
• 1200mm – common in larger bathrooms
• 1500mm + – often (double sink) in master bathrooms

Measure the full width of your vanity, from end to end. This is your starting point for sizing your mirror.

Use Your Sink as a Guide

If your vanity has two sinks, the mirror doesn’t need to match the full width. Instead, you can match the mirror to the sink area underneath.

You have two options when choosing your bathroom mirrors...

Option 1: One Large Bathroom Mirror

Use a wide mirror that covers both sinks together. It should be 70% to 95% the width of the vanity, no more.

Example:

• Vanity: 1800mm
• Mirror: 1260mm to 1710mm wide
• Height: 900mm to 1200mm

This look is simple, open and works well for larger spaces.

Option 2: Two Vanity Mirrors

Use two mirrors, one over each sink. Each one should match the width of the sink, not the full vanity.

Example:

• Vanity: 1800mm with two 600mm sinks
• Mirrors: 450mm to 650mm wide each
• Height: 900mm to 1100mm (depending on your ceiling height)

This style gives each person their own mirror space.

General Mirror Sizing Rule: 70% to 95% of Your Vanity Width

Here’s a quick guide:

• Keep mirror width between 70% to 95% of your vanity’s width
• Don’t go wider than your vanity
• Leave a bit of space (around 50–100mm) on each side if possible

This range keeps your mirror looking neat and most importantly, in proportion.

How High Should a Mirror Be Above the Vanity?

Start your mirror about 100–150mm above the vanity top or wall mounted taps. This helps keep it safe from splashes. End the mirror about 150–300mm below your ceiling or below any lights.

Your mirror height depends on:

• Your ceiling height
• Light fixture placement
• Wall mounted taps
• How tall people are

You want to aim for a height that shows your full face and shoulders clearly for daily functionality.

Here's Some "Do’s and Don’ts" for Bathroom Mirror Sizing

Do:

• Match the mirror to your vanity or sink
• Leave a small gap (50–100mm) on each side
• Choose a height that shows your full face
• Match your mirror style to your bathroom design

Don’t:

• Let your mirror go wider than your vanity
• Choose a mirror that’s too narrow
• Mount it too low for functionality
• Forget about your bathroom fixtures (wall mounted taps/power points)
• Skip measuring—always check sizes before you buy

Final Thoughts: The Right Bathroom Mirror Makes All the Difference

Picking the right mirror is easy when you:

• Measure your vanity and sink
• Choose between one mirror or two (for double vanities)
• Stay inside 70–95% width
• Hang it at a comfortable height

A well-sized mirror gives you better light, a cleaner look and helps your bathroom feel finished.

FAQs

1. Can my mirror be wider than the vanity?
   
   No. Your mirror should always be narrower than your vanity—up to 95% of its width is okay.
   
   
2. How high should I hang my bathroom mirror?
   
   Start the mirror 100–150mm above the vanity top, and keep the top edge below the ceiling or light fixtures.
   
   
3. Should I get one mirror or two for a double sink vanity?
   
   Either can look great for your space. Choose one wide mirror to cover both sinks, or use two smaller mirrors above each sink.
   
   
4. What if my vanity is 2000mm + wide?
   
   You can use a mirror around 1800mm wide, like an Isla | Bathroom Mirror or pair two mirrors sized to the sinks below, like Elara | Oval Bathroom Mirror for example.
   
   
5. Do LED mirrors follow the same rules?
   
   Yes. Just be sure they stay within the correct width range and have power points behind the mirrors to keep a clean aesthetic, like the Fia | LED Bathroom Mirror.
   
   

Looking For Designer Mirrors For Your Bathroom?

You can see more options in our full Bathroom Mirror Collection // All our mirrors are designed to work with Australian homes and vanities of all sizes.