Buying a computer monitor: how to choose the right screen for your needs

Buying a computer monitor seems straightforward, until you have to choose between Full HD, QHD, 4K, IPS, VA, 75 Hz or 240 Hz. Marketing copy often focuses on one standout specification, while other features may be less suited to your computer, desk or the way you use it.

The most common buying mistakes come down to three pitfalls:

• A high refresh rate without enough graphics performance: a 180 Hz or 240 Hz monitor won’t automatically display 240 frames per second if your computer can’t produce them.
• A large screen with too low a resolution: 27 inches with Full HD may be fine for everyday use, but text and windows won’t look as sharp as they do on QHD or 4K.
• Focusing on the panel but overlooking the connections: a USB-C monitor is only practical if USB-C can also carry a video signal and supply enough power. So check the Power Delivery specification.

What should you look for when buying a monitor?

1. Match the resolution to the screen size

Resolution determines how many pixels the screen displays. Full HD is 1920 × 1080 pixels, QHD is 2560 × 1440 and 4K is 3840 × 2160. At the same screen size, a higher resolution generally gives you a sharper picture.

• 21.5 to 24 inches: Full HD is suitable for word processing, admin and general home use.
• 27 inches: QHD gives you more workspace and a higher pixel density than Full HD. A 27-inch 4K monitor offers even more detail.
• 31.5 inches and above: 4K is practical for photos, video, spreadsheets and working with multiple windows.
• Ultrawide: a 34-inch screen with 3440 × 1440 pixels is designed for multitasking without needing two separate monitors. A 32:9 screen does, however, need plenty of desk space.

Also check your laptop or desktop’s graphics capabilities. 4K at a high refresh rate, in particular, demands more from your graphics card and connection.

2. Refresh rate and response time

The refresh rate, measured in Hz, tells you how often the image can be updated each second. 75 Hz is a practical choice for office work and general use. A gaming monitor with 165 Hz, 180 Hz or 240 Hz can display motion more smoothly, especially when your computer can produce enough frames.

Response time is often listed as, for example, 1 ms or 0.5 ms. Always check the measurement method, such as GtG or MPRT. These figures aren’t directly comparable. Adaptive-Sync, FreeSync or a similar variable refresh rate can help reduce screen tearing, but check that the feature works through your chosen HDMI or DisplayPort connection.

3. Panel type, connections and ergonomics

An IPS monitor is often associated with wide viewing angles and consistent colours in product information. This makes IPS a good option for office work, image editing and multi-screen setups. A VA panel often has a higher stated static contrast ratio and is common in curved and ultrawide monitors. OLED and QD-OLED screens can offer different benefits, but if you display static images for long periods, check the manufacturer’s guidance on image retention.

Also look out for:

• USB-C with Power Delivery: check how many watts it supplies. Models in the range, for example, offer 60, 65, 90 or 100 watts.
• HDMI and DisplayPort: check that the version supports your chosen resolution and refresh rate.
• USB hub, KVM and Ethernet: useful for a home-working monitor or an office monitor used with multiple computers.
• Height adjustment, swivel and tilt: an ergonomic monitor can be a better fit for your desk. Also check VESA compatibility and the dimensions of the stand.
• Energy consumption: check the energy label and stated consumption per 1,000 hours. A higher resolution or larger screen may use more power.

Recommended monitors for different users

Suitable for: Budget-conscious beginners

ASUS VA24EQSB-W computer monitor

Why it suits this profile: This 23.8-inch Full HD monitor is designed for everyday work, study and general use. IPS technology, 75 Hz and an adjustable stand provide a practical setup without unnecessary gaming features.

How this product avoids the pitfall

The screen combines Full HD with a compact size and has HDMI, DisplayPort and VGA connections. That makes it less likely you’ll need extra adapters for older equipment.

Main benefit and key features

IPS panel, 75 Hz, height adjustment, pivot function and a built-in USB hub, according to the product specifications.

Suitable for: Buyers looking for premium quality

BenQ PD3205U computer monitor

Why it suits this profile: This 31.5-inch 4K monitor is designed for users who value detail, colour reproduction and a well-organised workspace for design, photography or video.

How this product avoids the pitfall

The combination of 4K, IPS and stated 99% sRGB/Rec. 709 coverage makes it a better fit for graphic design than a large Full HD screen.

Main benefit and key features

4K resolution, USB-C with up to 90 W Power Delivery, KVM function and a height-adjustable stand.

Suitable for: Specialist needs and intensive use

MSI MAG 274F computer monitor

Why it suits this profile: For competitive gamers, 200 Hz, Adaptive-Sync and a stated response time of 0.5 ms are useful specifications, provided your PC can deliver that frame rate.

How this product avoids the pitfall

The high refresh rate is clearly specified. However, check that your DisplayPort or HDMI output and graphics card support 200 Hz at Full HD.

Main benefit and key features

27-inch IPS panel, Full HD, 200 Hz, Adaptive-Sync and a matte screen surface.

Frequently asked questions about buying a monitor

Is 75 Hz enough for office work and working from home?

For word processing, email, admin and video calls, 75 Hz is generally a practical specification. Also consider resolution, brightness, connections and adjustability. A 75 Hz monitor can also be suitable for general entertainment, while gamers often look for 120 Hz or higher.

How long does a computer monitor last?

Its lifespan depends on how it’s used, heat, settings and panel type. Check the warranty terms and keep your proof of purchase. Place the screen on a stable surface, keep the ventilation openings clear and clean it with a soft, dry cloth. If you have an OLED monitor, it’s best to follow the manufacturer’s care advice about static images.

Does a 4K monitor use a lot of power?

Power consumption varies depending on the size, brightness, panel and energy mode. Check the energy label and the consumption figure per 1,000 hours. Turn the monitor off when you won’t be using it for a while, and use the automatic sleep mode. This will help you estimate the running costs before completing your purchase.