Standard Mirror Sizes: Full Guide

When sized correctly, mirrors offer more than just a glimpse of your appearance—they also make a statement that can show off your home while making your interior space look bigger than it really is. While mirror sizes vary a lot, a few dimensions stand out as the most standard mirror sizes you’ll see as you shop around. Let’s break down the most common mirror sizes and how you can choose the right-sized mirror for your latest home improvement project.

What Is the Standard Mirror Size?

A standard mirror size is 24 inches by 36 inches, but sizes can depend on the space where you’re installing a mirror. Smaller applications commonly come in a 16-inch-by-24-inch size, and larger spaces may require a mirror size of 60 inches by 36 inches or bigger.

Standard Mirror Size by Type

The standard size of your mirror can change based on the type of mirror, so it’s important to consider where you’re installing the mirror and for what purpose. For example, a standard bathroom mirror size will probably be much smaller than a full wall mirror due to the area’s size. Here’s a breakdown of different common sizes depending on what type of mirror you plan to install: 

Bathroom Vanity Mirror Dimensions

Most standard vanity mirror sizes fall somewhere between 18 and 40 inches wide by 28 and 48 inches in height. These mirrors tend to be smaller than the average mirror size and have dimensions relative to the size of the vanity. Keep in mind, a Jack and Jill vanity may require two mirrors or one larger mirror to compensate for the additional space.

Door Mirror Dimensions

The average-sized door mirror ranges from 12 to 16 inches wide by 47 to 55 inches tall. Door mirrors generally run narrower and taller than other mirror types and have limited space width-wise. 

Your level of visibility plays a role in the height of your door mirror, but you’ll also want to consider the installation method. Heavier door mirrors have hooks that hang over the door and limit how high or low the mirror will be when it’s installed. When in doubt, choose a larger size for this option. Lightweight door mirrors have mounting hardware that allows you to install your door at the exact height you want, giving you more flexibility in the height of your mirror.

Full-Length Mirror Dimensions

If you’re looking for a mirror that shows your full profile, then a full-length mirror fits the bill. These mirrors naturally run larger in height than standard mirrors but can have a narrower width, with sizes ranging from 13 to 24 inches wide by 60 to 72 inches in height. 

Most full-length mirrors go on a wall, but you can also purchase a standalone, full-length mirror to avoid the heavy-duty installation that comes with such a heavy accessory. This will take up additional space compared to other mirrors. 

Medicine Cabinet Mirror Dimensions

Medicine cabinet mirrors have the smallest average dimensions. Most measurements range from 15 to 24 inches wide by 20 to 36 inches high. You’ll need multiple mirrors to cover double or triple medicine cabinets, so factor in your medicine cabinet size to anticipate purchasing additional mirrors as needed.

Round Mirror Dimensions

Round mirrors work in several locations—from wall accents to mirrors with LED lighting in bathroom vanities. For this reason, round mirror sizes vary significantly in size. Overall, however, round mirror dimensions range from 24 to 36 inches in diameter. 

Wall Mirror Dimensions

Wall mirrors have the biggest dimension variation. Sizes range from 16 to 60 inches wide by 22 to 76 in height. Depending on your personal preference, wall mirrors may be longer than they are wide or vice versa. You can use multiple mirrors, unique framing, and bevelling to create a panel of wall mirrors, a single wall mirror to add a touch of character to your room, or consider mirroring a full wall to create the illusion of more space.

How to Measure the Right Size Mirror

The right mirror size can be subjective, but there are still some dos and don’t’s to sizing your mirror that can impact the overall look of a space. By understanding the size of the space, the accuracy of your measurements, and the installation method, you’ll have a better chance of knowing how to measure for a mirror. 

Consider the Space

Measuring the right mirror size starts with understanding the space where you plan on installing it. A very large mirror will overpower a small vanity, while a small mirror on a large wall might have little to no wow factor. If you’re installing a mirror over your bathroom vanity, a good way to calculate the best mirror size is to choose one that is slightly smaller than the vanity’s width. 

Take Accurate Measurements

If you’re installing mirrors on your medicine cabinet or full wall, you must get the right measurements for a successful installation. Always double-check your measurements before purchasing mirrors. 

This can be simple for a medicine cabinet, but getting the right dimensions for a mirrored wall can be complex, especially if you’re using multiple, smaller mirrors, unique patterns, or need custom cut-outs for outlets and other parts of your wall. Since mirroring a wall costs more and requires more materials than simply installing a single mirror, you should hire a professional to accurately order the right-sized mirrors. 

Remember the Installation Process

Since mirrors can be heavy, knowing exactly where your studs are in the walls can influence where you install them. Certain sizes may not be suitable for a wall if there aren’t enough studs to stabilize the mirror. You may need to increase or decrease the size to increase the stability of your mirror installation. 

Things to Consider Before Choosing a Mirror Size

Before you choose a mirror, you’ll want to factor in your aesthetic, budget, installation site, and maintenance levels to help prevent picking the wrong mirror size. 

Aesthetic 

If you’re hoping to make a major impact in your home by installing a mirror, a large mirror is more likely to create the look you want. Likewise, if your goal is to add subtle touches to your interior design, then a smaller mirror, or even several small mirrors, can achieve the look you want. 

Budget

The average cost to install a mirror is around $300 for materials and labor, but prices can range from $100 to $500. Custom-cut mirrors cost more, with the cost to cut glass adding another $50 to $75 for standard-sized mirrors, or over $200 for an extra-large mirror. If a custom mirror size is out of your price range, you can save money on mirrors by purchasing a standard mirror size.

Installation Site

Again, where you plan on installing your mirror impacts the size of the mirror. Measure your vanity, wall, door, medicine cabinet, or other installation site to estimate the correct mirror size relative to the space. 

Maintenance

Installing a large mirror may sound like a good idea, aesthetically speaking, but if you don’t want to invest much time or physical labor into maintaining your mirror, then it might not be the right fit for you. Tall mirrors can be hard to clean without a footstool. 

And, if you haven’t quite mastered how to clean a mirror without streaks, you could find yourself getting frustrated with needing to keep your mirrors crystal clear. A smaller mirror, or one that is wider instead of higher, can save you the trouble of having to go all out on cleaning your mirror.

What to Do if You Have the Wrong Size Mirror

If you choose the wrong mirror size, the best-case scenario is that your mirror will not effectively enhance your space. However, the worst-case scenario could result in damage to your walls, injuries, and a major clean-up. That’s why you should always factor in the size of your mirror and the correct installation method before installing it. 

Most mirrors are made of glass. Add any frames or lighting, and you could potentially have a very heavy mirror on your hands. Not to mention, some lighting requires electrical work best left for a local electrician.

That’s why we recommend working with a professional mirror installer near you to handle heavy mirrors. They have the expertise to correctly install heavy mirrors without damaging your property or increasing your odds of injury. A pro can also recommend an electrician for intricate lighting and other specs, like smart mirror features.