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LG 27UD58-B Monitor Review

Tested using Methodology v1.0
Review updated Feb 21, 2018 at 03:01 pm
Latest change: Retest Jul 02, 2021 at 11:58 am
LG 27UD58-B Picture
Mixed Usage
Media Creation
HDR Gaming

The LG 27UD58-B is a good 4k IPS gaming monitor with passable picture quality. It has a few gaming-oriented features such as FreeSync and very low input lag for a 60Hz monitor. Motion handling is also good but limited by the relatively low refresh rate. Unfortunately, backlight bleed is bad when viewed in a dark room and the reflection handling isn't as good as some other monitors when viewed in a bright room.

Our Verdict

7.2 Mixed Usage

The LG 27UD58 is a decent monitor for mixed usage. Gaming-oriented features such as FreeSync and the low input lag result in good gaming performance, but the picture quality is only passable. The sides of the image do remain accurate when viewed from up-close due to the wide viewing angles, which is good.

  • Input lag is very low.
  • Solid colors and backgrounds are uniform.
  • High resolution is great for multitasking.
  • Blacks appear gray and blotchy.
  • Prominent backlight bleed.
7.4 Office

The LG 27UD58 is decent for office use. The limited ergonomic adjustments make it less convenient to show images to coworkers or to find a comfortable viewing position for long periods of time. The high resolution is a bonus for productivity and multitasking, which is good. The picture quality of the LG 27UD58-B is only passable, but the image remains accurate when viewed at an angle, which is good.

7.5 Gaming

The LG 27UD58 is a good monitor for gaming. The combination of FreeSync, low input lag, and good motion handling results in a responsive and tear-free experience, which is good. Unfortunately, the 60Hz refresh rate limits the performance for fast-paced games and the picture quality is only decent.

7.1 Multimedia

The LG 27UD58 is a decent monitor for media consumption. Coverage of the most used sRGB color space is great, and the gray uniformity is good. The image also remains accurate when viewed at an angle, which is great. Unfortunately, the picture quality is only passable and is limited by the low native contrast ratio and poor black uniformity of the IPS panel.

7.1 Media Creation

The LG 27UD58 is decent for editing photos or videos. The out of the box image accuracy is great, and the image also remains accurate when viewed at an angle. Unfortunately, the low native contrast ratio and poor black uniformity reduce the picture quality.

5.3 HDR Gaming
  • 7.2 Mixed Usage
  • 7.4 Office
  • 7.5 Gaming
  • 7.1 Multimedia
  • 7.1 Media Creation
  • 5.3 HDR Gaming
  1. Updated Jul 02, 2021: Changed height adjustment result from 'N/A' to '0' to match our methodology.
  2. Updated Jan 17, 2019: We tested the monitor's compatibility with NVIDIA's new FreeSync driver. See our full investigation into NVIDIA's FreeSync Drivers here.
  3. Updated Jan 22, 2018: Review published.
  4. Updated Jan 20, 2018: Our testers have started testing this product.
  5. Updated Jan 20, 2018: Early access published.
  6. Updated Jan 10, 2018: We've purchased the product and are waiting for it to arrive in our lab.

Differences Between Sizes And Variants

We tested the 27" model (27UD58B-P). However, the monitor is also available in 24" (24UD58B-P). It is also closely related to the higher end 27UD68, which is available in white (27UD68P-W) and black (27UD68P-B) variants.

If someone comes across a different type of panel or if their 27UD58B-P doesn't correspond to our review, let us know and we will update the review. Note that some tests such as the gray uniformity may vary between individual units.

Model Size Refresh rate Notes
24UD58-B 24" 60Hz  
27UD58-B 27" 60Hz  
27UD68P-B 27" 60Hz Black variant
27UD68P-W 27" 60Hz White variant
27UK650-W 27" 60Hz White variant

Compared To Other Monitors

Comparison picture

The LG 27UD58B-P is a decent 4k monitor with an IPS screen and FreeSync support. It is one of the best gaming monitors under $300 we have tested. See our recommendations for the best monitors for Xbox One X and the best PC gaming monitors.

LG 27UK650-W

The LG 27UK650 is much better than the LG 27UD58-B. The LG 27UK650 has better ergonomics, making it easier to place it comfortably. The LG 27UK650 has marginally better vertical viewing angles and marginally better SDR peak brightness, which are important for office use. Finally, the LG 27UK650 supports HDR content and has better black uniformity, which make it a better choice for multimedia watching.

LG 27UD68-B

The LG 27UD68P-B is better than the LG 27UD58-B, but overall, performance is very similar between the two. The 27UD58-B has a fixed stand that has extremely limited flexibility, whereas the 27UD68P-B has a telescoping stand and can rotate between a portrait and landscape orientation. The 27UD58-B is brighter as well.

LG 29UM69G-B

The LG 27UD58-B is better than the LG 29UM69G-B. The LG 27UD58-B has a 4K UHD resolution with more detail that makes it easier to multitask, like when you're creating media or watching multimedia while browsing the net. On the other hand, the LG 29UM69G-B has a slightly better refresh rate, a faster pixel response time, and supports black frame insertion (BFI) to clear up blur. All these features are good news for those who plan to use it for video gaming.

Samsung UE590

The LG 27UD58-B is much better than the Samsung UE590. The LG 27UD58-B has much wider viewing angles, and there are no duplications in moving objects as the backlight is flicker-free. The 27UD58 has better gray uniformity, which is great for watching streaming sports.

Dell U2717D

The LG 27UD58-B is slightly better than the Dell U2717D. The 27UD58-B has wider viewing angles and is better suited for gaming with much lower input lag and support for AMD's FreeSync technology. The higher resolution of the 27UD58-B makes it easier to multitask, but can be a bit more demanding on a PC. The Dell U2717D has far more ergonomic options, so it is easier to place it in a comfortable position.

Sceptre C325W

The LG 27UD58-B is significantly better than the Sceptre C325W. The LG 27UD58-B has better viewing angles due to its IPS panel. It also has a much lower input lag and a faster pixel response time and supports the FreeSync VRR implementation which is excellent if you play games. The LG 27UD58-B has a much better resolution that allows it to display more detail on the screen. The Sceptre C325W, on the other hand, has a higher native contrast ratio that delivers deep blacks, and a better reflection handling so it can be placed in a room with many small light sources.

Dell U2518D

The Dell U2518D is much better than the LG 27UD58-B. The Dell U2518D supports HDR whereas the LG 27UD58-B doesn't. The Dell U2518D has better motion blur for slightly better gaming and significantly better ergonomics that allow you to place it more comfortably. The Dell U2518D can get brighter, and this is great for office use. On the other hand, the LG 27UD58-B has a better resolution which makes it slightly better for those who seek the extra detail. Also, the LG 27UD58-B has better input lag and better refresh rate.

HP 27Q

The LG 27UD58-B is somewhat better than the HP 27Q. The LG 27UD58-B has a better input lag and is more responsive to your actions. It also has better resolution allowing you to display more in the same screen size. On the other hand, the HP 27Q is brighter and can handle reflections better, so it's more suitable for a slightly brighter room with many light sources.

+ Show more

Test Results

Size 27"
Curved No
Curve radius N/A
Weight (without stand)
9.9 lbs (4.5 kg)
Weight (with stand)
12.1 lbs (5.5 kg)

The design of the LG 27UD58-B monitor is good. The monitor looks good from the front, due to the fairly unique crescent stand. The black borders also look good, even if they are a bit thicker than most other monitors. Unfortunately, the ergonomic adjustment options are limited with only the ability to tilt the monitor which can make it difficult to find a comfortable viewing position. The build quality is decent, and the stand feels stable.

15.7" (39.9 cm)
8.0" (20.3 cm)

The stand of the LG 27UD58-B is similar to other LG monitors (and TVs) such as the 27UD68P-B. It has a fairly small footprint and feels stable.

Height Adjustment
0.0" (0.0 cm)
Switch portrait/landscape No
Swivel Range N/A
Tilt Range -20° to 5°

Update 07/02/2021: We previously had incorrectly listed the Height Adjustment as 'N/A' as opposed to '0'. The review has been updated to reflect this change, as the Ergonomics score has dropped slightly.

The ergonomic adjustments of the LG 27UD58-B are very limited, which can make it difficult to find a comfortable viewing position or to share images with coworkers.

Wall Mount VESA 100x100

The rear of the monitor is basic but looks good. All of the inputs are located on the same panel and do stick directly out the back, which may make them more difficult to connect in some setups. It looks quite similar to the 27UD68P-B, but with a matte plastic finish instead of glossy.

0.9" (2.3 cm)

The borders of the LG 27UD58 are quite thin and look good. There is only a small gap between the edge of the border and the first pixels.

Thickness (with stand)
5.9" (15.0 cm)
Thickness (without stand)
1.8" (4.6 cm)

The LG 27UD58-B monitor appears quite thin when viewed from the side. It has two tiers of thickness, but even the thicker part where the VESA mount attaches is quite thin, and the monitor sits close to a wall with the stand attached.

Build Quality

The build quality of this LG 27UD58 monitor is decent. It is entirely made of plastic, including the stand which isn't an issue but the joints do feel a bit flimsy. This isn't an issue with normal use though.

Picture Quality
Picture Quality
LCD Type
Native Contrast
989 : 1
Contrast with local dimming

The monitor has a passable contrast ratio. With a contrast ratio just shy of 1000:1, the monitor won't be the best monitor to use in a dark room since it can't really reproduce deep blacks which is important for dark video content. When set in a bright room though, the LG 27UD58-B does a much better job and is on par with other IPS monitors.

Picture Quality
Local Dimming
Local Dimming

This monitor does not feature a local dimming option. The video is for reference only.

Picture Quality
SDR Peak Brightness
SDR Real Scene
220 cd/m²
SDR Peak 2% Window
239 cd/m²
SDR Peak 10% Window
241 cd/m²
SDR Peak 25% Window
240 cd/m²
SDR Peak 50% Window
240 cd/m²
SDR Peak 100% Window
239 cd/m²
SDR Sustained 2% Window
241 cd/m²
SDR Sustained 10% Window
241 cd/m²
SDR Sustained 25% Window
240 cd/m²
SDR Sustained 50% Window
240 cd/m²
SDR Sustained 100% Window
240 cd/m²

The SDR peak brightness is decent. It can't get as bright as the LG 27UD68P-B, but doesn't dim at all when showing static images which is good.

Picture Quality
HDR Peak Brightness
HDR Real Scene
HDR Peak 2% Window
HDR Peak 10% Window
HDR Peak 25% Window
HDR Peak 50% Window
HDR Peak 100% Window
HDR Sustained 2% Window
HDR Sustained 10% Window
HDR Sustained 25% Window
HDR Sustained 50% Window
HDR Sustained 100% Window

HDR is not supported.

Picture Quality
Horizontal Viewing Angle
Color Shift from Left
Color Shift from Right
Brightness from Left
Brightness from Right
Black Level from Left
Black Level from Right
Curve Radius N/A

The horizontal viewing angle is decent. When viewed at an angle, the colors do shift, but much less so than monitors with TN or VA panels such as the Samsung CHG70 and Dell S2716DG. The brightness also drops off as seen in the video.

Picture Quality
Vertical Viewing Angle
Color Shift from Below
Color Shift from Above
Brightness from Below
Brightness from Above
Black Level from Below
Black Level from Above

When viewed from the top or bottom, the image remains accurate which is great. This is almost the same as the LG 27UD68P-B.

Picture Quality
Gray Uniformity
50% Std. Dev.
50% DSE
5% Std. Dev.
5% DSE

Great gray uniformity for the LG 27UD58-B. Looking at the 50% gray test picture, we can see that the regions near the top and bottom of the screen are a bit darker than the center regions, but besides that nothing really striking can be noticed.

When it comes to the 5% gray uniformity, this LG monitor does a good job, as nothing really bad can be noticed. Overall, this is a good result for this monitor.

Picture Quality
Black Uniformity
Native Std. Dev.
Std. Dev. w/ L.D.

The black uniformity of this LG 27UD58-B monitor is poor. Backlight bleed is prominent near each corner of the screen, with the lower right one being the better of them. This poor black uniformity means that dark video content, like dark video cut-scene from video games or any other dark multimedia content, will suffer from this uniformity issues, especially when the monitor is used in a dark room. This is less of an issue if the monitor is used to do office work, as the dark content is more rare.

Picture Quality
Pre Calibration
Picture Mode
254 cd/m²
Luminance Settings
Contrast Setting
RGB controls
Color Temperature
6,521 K
White Balance dE
Color dE

Out of the box, this monitor has great accuracy. The best measurement was done under the 'Custom' picture mode, but all the other picture modes gave reasonably good readings, except the 'Reader' picture mode, which had a white balance and color dE around 10.

The low white balance dE and color dE (both under 3.0), paired with good color temperature, means this monitor really gives good accuracy, which should be plenty good for most people. The gamma is a bit below our 2.2 target, and the curve does not track that closely our target curve, but for out of the box settings this is still pretty good.

Overall, the LG 27UD58-B could be used by most people, except maybe professionals, without any calibration.

Update: The luminance value has been updated, as there was an error when the data was entered into our system. The good luminance data is 253.9 cd/m² instead of 523.9 cd/m².

Picture Quality
Post Calibration
Picture Mode
100 cd/m²
Luminance Settings
Contrast Setting
RGB Controls
Color Temperature
6,368 K
White Balance dE
Color dE

After calibration, the accuracy of the LG 27UD58-B is excellent. The change in accuracy from the 'Out of the box' settings is not enormous since the monitor had already a good accuracy, but there was still some place for improvement. Now, both white balance dE and color dE are under 1.0, at which point, almost nobody can discern inaccuracies. Looking at the CIE color space image, we can see that the colors that were a bit oversaturated (mostly in the reds and greens) are now tracking much more closely to their targets. As for the gamma, that was a bit low and not tracking the target curve very closely, is now almost spot on on both aspects.

Overall, this monitor is very accurate and should give anyone who uses it a very good experience.

You can download our ICC profile calibration here.

Picture Quality
SDR Color Gamut
sRGB xy
Adobe RGB xy

The color performance of the LG 27UD58-B is great at covering the most common sRGB colorspace. Coverage of the Adobe RGB colorspace is more limited though, which is a downside for professional color use.

Picture Quality
SDR Color Volume
sRGB in ICtCp
Adobe RGB in ICtCp

The color volume of this monitor is great. The low contrast ratio results in a less complete coverage in the darker areas of the volume, but the great gamut results in a fairly full coverage otherwise.

Picture Quality
HDR Color Gamut
Wide Color Gamut
DCI P3 xy
Rec. 2020 xy

HDR is not supported.

Picture Quality
HDR Color Volume
DCI-P3 in ICtCp
Rec. 2020 in ICtCp

HDR is not supported.

Picture Quality
Image Retention
IR after 0 min recovery
IR after 2 min recovery
IR after 4 min recovery
IR after 6 min recovery
IR after 8 min recovery
IR after 10 min recovery

Perfect score on the image retention test for this LG monitor as no image retention could be noticed at all.

Picture Quality
Color Depth
10 Bit

The LG 27UD58-B does an amazing job at displaying our gradient test image, as we can see in our test picture. Almost no banding is visible at all, besides some very minimal banding in the dark part of the colors. As this monitor support 10-bit input, no banding generally seen on an 8-bit monitor is visible, overall, this is an excellent result.

Picture Quality
Color Bleed
Pixel row error
Pixel column error

When displaying large swaths of a single color no issues can be seen with the color bleed performance.

Picture Quality

The reflection handling of the LG 27UD58-B is decent. It has a light-matte finish which diffuses reflections across the screen but this also helps to reduce their intensity. For most rooms, this isn't an issue, but in a bright room, the reflections and haze may be distracting.

Motion Blur
80% Response Time
5.6 ms
100% Response Time
16.8 ms
Best Overdrive Setting

Response Time Off
Response Time Low
Response Time Middle
Response Time High

Good pixel response time, good enough for fast motion in video games and TV shows. This results in a clear image with only a short trail visible as shown by the photo above. The 'Response Time Middle' setting was the most balanced and the 'High' setting produced a slightly faster rise time. Unfortunately, it also added a distracting amount of overshoot and therefore, is not recommended.

Overall, the response time is slightly worse than the 27UD58-B's sibling, the 27UD68P-B, but this could just be variance from unit to unit. The competing Samsung UE590 4K monitor has a more significant response time advantage though.

Image Flicker
Flicker-free Yes
PWM Dimming Frequency
0 Hz
Black Frame Insertion (BFI)
BFI Maximum Frequency
BFI Minimum Frequency

Like most monitors, the LG 27UD58 has a flicker-free backlight, which is great as this results in smoother motion. Unfortunately, the monitor lacks a black frame insertion feature to intentionally add flicker to clear up motion when playing fast-paced video games. However, it's common for a 60Hz monitor to lack BFI because many people find 60Hz flicker distracting.

Refresh Rate
Variable Refresh Rate
Native Refresh Rate
60 Hz
Factory Overclock
Variable Refresh Rate
G-SYNC Compatible
VRR Maximum
60 Hz
VRR Minimum
40 Hz
VRR Maximum With OC
VRR Supported Connectors DisplayPort

The monitor has a fairly ordinary 60Hz maximum refresh rate; this is good enough for most usages but everyone would benefit from a higher refresh rate, especially gamers. Fortunately for gamers, the monitor supports FreeSync variable refresh rate technology, although only within a fairly narrow range of 40-60Hz.

The monitor has two different FreeSync modes: 'Basic' (range 48-60Hz) and 'Extended' (range 40-60Hz). We recommend using the 'Extended' range, and only using the 'Basic' range as a fallback for games that have problems with the 'Extended' range. Also, it was discovered that FreeSync only works properly when the monitor's 'Ratio' setting is set to 'Wide' and has problems when 'Ratio' is set to 'Original'.

Update 01/15/2019: We have tested the 27UD58 with NVIDIA's new FreeSync drivers. The 'Extended' mode does not work properly and caused worse tearing. The 'Basic' FreeSync mode on the monitor works without any serious issues, across the 48-60Hz range.

Input Lag
Native Resolution
8.8 ms
Non-Native Res @ Native Refresh
8.8 ms
Native Resolution @ 60 Hz
8.8 ms
Variable Refresh Rate
9.5 ms
10 bit HDR
Black Frame Insertion (BFI)

Great low input lag, good enough for all but the most competitive gamers. The input lag stays fairly consistent in all situations, even when using FreeSync, which is good.

Resolution and Size
Native Resolution 3840 x 2160
Aspect Ratio 16:9
Megapixels 8.3 MP
Pixel Density 164 PPI
Screen Diagonal 26.9"
Screen Area 310 in²

The monitor's defining feature is its very sharp 4K UHD resolution, which can show every pixel in 4K movies and TV shows in all their glory. All these pixels are shown on a panel with a modest 27" size, giving the monitor a very high pixel density; this is great for most applications, but it can make text too small to read comfortably when DPI scaling isn't used. This size and resolution are the same as the LG 27UD58-B's sibling, the 27UD68P-B; the competing Samsung UE590 4K monitor is slightly larger at 28", but has worse picture quality in general.


All of the inputs are located on the rear of the monitor.

Total Inputs
DisplayPort 1 (DP 1.2)
Mini DisplayPort No
HDMI 2 (HDMI 2.0)
DisplayPort Out No
Analog Audio Out 3.5mm 1
Microphone In 3.5mm No
Digital Optical Audio Out No
Analog Audio Out RCA No
Power Supply Internal
Additional Features
HDR10 No
Multiple input display

The LG 27UD58-B monitor has a few extra features that are useful in certain situations. The 'Super Resolution+' feature uses better upscaling image processing than the default, which can be useful when the monitor is being used at a lower resolution like 1080p. The 'Black Stabilizer' feature warps the monitor's gamma curve to brighten or darken dark details like shadows, which can be useful when playing some competitive games. The monitor also has an 'Automatic Standby' timer to put the monitor on standby after 4, 6 or 8 hours.

On-Screen Display (OSD)

The LG 27UD58-B monitor's on-screen display is controlled by a small joystick nub on the screen's bottom edge, which also doubles as the power button. This joystick turns out to be a really intuitive way to navigate the OSD, better than the four button scheme used by most monitors. Many other LG monitors use this joystick, like the 29UM69G-B, as well as many Samsung monitors like the CHG70.

In The Box

  • Manual and drivers
  • Calibration report
  • Power cable
  • Displayport cable
  • HDMI Cable