Use a tape measure from corner to corner – that’s how to measure computer monitor size. You measure just the screen area, not the plastic frame around it, to get the right number.
People get this wrong all the time. They include the bezel and get a bigger number. But stores list screen size only, so your numbers won’t match.
I’ve helped dozens of friends with this. It’s a simple task that trips up many. Once you know the trick, it’s easy.
This guide will show you the right way. You’ll learn to measure for size, for a new stand, and for your desk space. Let’s get started.
Why You Need to Know How to Measure Computer Monitor
You might need a new monitor. Or maybe you want a second screen. Knowing the size helps you shop smart.
If you measure wrong, you buy the wrong thing. A 27-inch monitor is bigger than a 24-inch one. That difference matters on a small desk.
You also need to know for mounts and stands. The VESA pattern on the back has a standard size. Your mount must fit that pattern exactly.
I learned this the hard way. I bought a cool arm mount online. It didn’t fit my monitor’s back plate at all.
Screen size affects your work too. A bigger screen can help with editing or gaming. A smaller one saves space in a tight room.
So learning how to measure computer monitor is a basic skill. It saves you time, money, and hassle later on.
The Right Tools for the Job
You don’t need fancy gear. A simple tape measure works best. The soft, flexible kind is perfect for this.
A ruler can work in a pinch. But it’s hard to stretch across a big screen. A tape measure bends around the curve.
Make sure it shows inches clearly. Monitor sizes are always in inches. Some tapes show both inches and centimeters.
You might want a notepad too. Write down the numbers so you don’t forget. I always forget if I don’t write it down.
A phone calculator helps with math. You might need to convert or calculate ratios. But it’s not required for a basic size check.
That’s really all you need. A tape measure and something to write with. Now let’s talk about where to put the tape.
Step-by-Step: How to Measure Computer Monitor Size
First, turn off your monitor. This lets you see the screen edges better. The black screen shows the true corners.
Place the tape’s end at the top left corner. Put it where the screen starts, not the plastic frame. This is the key step most people miss.
Stretch the tape to the bottom right corner. Go diagonal across the screen. Keep the tape flat against the glass.
Read the number in inches. That’s your monitor’s screen size. A 24-inch monitor will measure about 24 inches.
Write this number down. Label it “Screen Size – Diagonal”. You’ll need it for shopping or comparing.
That’s the core method for how to measure computer monitor size. Do this first before any other measurements.
How to Measure Computer Monitor for Width and Height
Sometimes you need width and height too. Maybe you’re fitting it in a cabinet. Or you need to know if two will fit side-by-side.
For width, measure from left to right. Again, measure only the screen area. Don’t include the bezels on the sides.
For height, measure from top to bottom. Start at the top of the viewable screen. End at the bottom of the viewable screen.
Write both numbers down. Note if it’s “screen width” or “screen height”. This helps when planning your setup.
You might also want the total dimensions. This includes the plastic frame. Measure the whole monitor from outer edge to outer edge.
Label this as “total width” or “total height”. This tells you how much desk space it takes up. The Ergonomics Center says desk space planning is key for comfort.
Understanding Aspect Ratio When You Measure
Aspect ratio is the width compared to height. It’s written like 16:9 or 4:3. This affects how movies and games look.
You can figure it out from your measurements. Divide the width by the height. Use a calculator for this part.
If width is 16 inches and height is 9 inches, that’s 16:9. Most new monitors use this wide format. It’s great for movies.
Some older monitors are 4:3. They look more square. These are less common now but still exist.
Why does this matter? If you replace a 4:3 with a 16:9, things look different. Websites stretch wider. Movies fill the screen better.
Knowing your aspect ratio helps when you shop. You can match your old monitor’s look. Or you can upgrade to a wider view.
How to Measure Computer Monitor for a Mount
This is a common need. You want a cool floating monitor arm. But you need the right measurements first.
Check the back of your monitor. Look for four screw holes in a square pattern. That’s the VESA mount pattern.
Measure the distance between the holes. Do horizontal and vertical. Common sizes are 75×75 mm or 100×100 mm.
Write down this pattern. Something like “VESA 100×100”. This is what you tell the mount seller.
Also check the monitor’s weight. Most monitors have a sticker on the back. It lists the weight in pounds or kilograms.
The mount must support that weight. A heavy monitor needs a strong arm. The OSHA has guidelines for safe mounting of equipment.
Now you know how to measure computer monitor for mounting. This ensures your new arm fits perfectly.
Measuring for Desk Space and Setup
Your desk has limited room. A big monitor might not fit. Measure before you buy a new one.
First, measure your desk’s depth. How far from the wall to the front edge? Your monitor should leave room for keyboard and mouse.
The Humanscale guide suggests 20-30 inches of viewing distance. Your monitor shouldn’t be too close to your face.
Measure the width where the monitor will sit. Will it fit with your speakers? Do you want space for a photo or plant?
Think about height too. Your eyes should look at the top third of the screen. You might need a stand to raise it.
Write all these desk numbers down. Compare them to your monitor’s total dimensions. This planning prevents a tight squeeze.
Common Mistakes in How to Measure Computer Monitor
I see the same errors again and again. Let’s avoid these common pitfalls.
Mistake one: measuring the bezel. This adds an inch or two. Your 24-inch monitor might measure 26 inches with the frame.
Mistake two: using a crooked tape. The diagonal must be straight corner to corner. A bent tape gives a wrong number.
Mistake three: measuring while on. A lit screen makes edges hard to see. Turn it off for a clear view.
Mistake four: forgetting to write it down. You’ll mix up numbers later. Always jot them on paper or your phone.
Mistake five: not checking the VESA pattern. People buy mounts that don’t fit. Always measure the screw holes.
Avoid these and you’ll get it right. Knowing how to measure computer monitor correctly saves return shipping fees.
Special Cases: Curved and Ultrawide Monitors
Curved screens are popular now. They measure a bit differently. The tape follows the curve of the glass.
Use a soft tape measure only. A metal one won’t bend right. Lay it along the screen’s curve from corner to corner.
Ultrawide monitors are extra wide. They might be 34 inches diagonal but very long. Measure the diagonal as usual first.
Then measure the width. It might be much wider than a normal monitor. Check if it fits on your desk.
These screens often have a strong curve. The measurement tape should hug that curve. Don’t pull it tight across the air.
The method for how to measure computer monitor still works. Just be gentle with the curved surface. Don’t press too hard.
Converting Measurements for Different Needs
Sometimes you need centimeters, not inches. Most of the world uses metric. Converting is easy.
One inch equals 2.54 centimeters. Multiply your inch measurement by 2.54. A 24-inch monitor is about 61 cm.
You might need pixels too. That’s for graphic design or gaming. Check your monitor’s settings for native resolution.
Common sizes are 1920×1080 for Full HD. That’s 1920 pixels wide by 1080 tall. A 4K screen is 3840×2160.
The PC Magazine tech guides explain resolution well. More pixels mean sharper images.
Write down all these numbers. Having inches, centimeters, and pixels helps. You can answer any question about your screen.
Using Your Measurements to Shop Smart
Now you have all the numbers. Time to use them for shopping. This is where the work pays off.
Take your diagonal screen size. Look for monitors close to that number. A 24-inch replacement should be 24 or 27 inches.
Check the total dimensions too. Will the new one fit your space? Compare width, height, and depth.
Match the VESA pattern if you have a mount. A 100×100 mount needs a 100×100 monitor. Don’t guess on this.
Think about aspect ratio. Do you want the same shape or a different one? Wider screens are great for multitasking.
Your notes on how to measure computer monitor are your shopping list. Bring them to the store or have them open online.
This prevents buyer’s remorse. You get a monitor that fits your space and needs. No surprises when it arrives.
Frequently Asked Questions
How do I measure computer monitor size accurately?
Use a tape measure on the diagonal of the screen only. Don’t include the plastic frame. Turn the monitor off to see the edges clearly.
Do I measure the bezel when measuring my monitor?
No, never include the bezel. Screen size refers to the viewable area only. The bezel adds extra inches that aren’t counted in the official size.
What’s the best tool for how to measure computer monitor?
A soft, flexible tape measure works best. It can bend for curved screens. A ruler is okay for small monitors but harder to use.
How to measure computer monitor for a wall mount?
Measure the VESA pattern on the back. Find the four screw holes and measure their spacing. Also check the monitor’s weight for mount compatibility.
Can I use a ruler instead of a tape measure?
Yes, but it’s trickier. You might need to piece together multiple measurements. A tape measure gives one continuous number more easily.
Why is my measurement different from the advertised size?
You might be including the bezel. Or your tape might be crooked. Advertised size is the diagonal of the lit area only.
Conclusion
So that’s how to measure computer monitor the right way. It’s a simple skill that helps in many situations.
Remember the key points. Measure diagonal, screen only, with a soft tape. Write down all your numbers for later.
Check for VESA patterns if mounting. Consider your desk space before buying new. Use your measurements to shop smart.
The FCC has consumer guides on electronics that can help too. Good information leads to good choices.
Now you can measure any monitor with confidence. Help your friends when they need it too. Pass on this simple knowledge.