RATED
Good
6.0/10
27″ LG 27U421A – Full Specifications
Another small-budget option with a modern touch, the LG 27U421A is a 27-inch VA monitor at 1920 × 1080 with a 48–100 Hz range, 99% sRGB and a USB-C input at 15W.
LG●Monitor
Display
27 in, VA, 1920 × 1080
27
Refresh Rate
48–100 Hz
48
Brightness
250 nits
Contrast Ratio
3000:1
3000
Overview
Another small-budget option with a modern touch, the LG 27U421A is a 27-inch VA monitor at 1920 × 1080 with a 48–100 Hz range, 99% sRGB and a USB-C input at 15W. It has an HDMI 1.4 port, weighs 3.7 kg and does not include speakers. It is a sensible second screen or entry-level desk monitor, though 81 ppi is not very sharp at this size. It is an easy way to add a large second screen to a desk without spending much.
- 27-inch VA Full HD at 81 ppi
- 48–100 Hz with variable refresh
- 99% sRGB, 250 nits, HDR10 input
- HDMI 1.4 and USB-C (15W)
- 3.7 kg, no speakers
Pros & Cons
Pros
- USB-C connection at a low price
- 100 Hz refresh feels smoother than 60 Hz
- Large 27-inch screen for more content
- Light at 3.7 kg and easy to place
- 99% sRGB colour for everyday use
Cons
- USB-C power is only 15W, so no real laptop charging
- 81 ppi looks soft at 27 inches
- No built-in speakers
- Tilt-only stand and HDMI 1.4 only
Score & Ratings
6.0/10
Good
Model Information
7
| Specification | Value |
|---|---|
| Brand | LG |
| Model | 27U421A |
| Model Alias | 27U421A-B |
| Full Product Name | LG 27U421A |
| Model Year | 2025 |
| Monitor Type | Full HD Monitor |
| Available Colors | Black |
Display & Panel
13
| Specification | Value |
|---|---|
| Screen Size | 27 in |
| Exact Diagonal | 26.99 in |
| Screen Shape | Flat |
| Aspect Ratio | 16:9 |
| Active Display Width | 596.736 mm |
| Active Display Height | 335.664 mm |
| Display Area | 91.21% |
| Panel Type | VA |
| Panel Manufacturer | AU Optronics |
| Backlight Type | W-LED |
| 3D Support | No |
| Screen Coating | Anti-glare / Matte |
| Coating Hardness | 3H |
27" Display Size (68.6 cm) 16:9
Resolution & Pixel Details
4
| Specification | Value |
|---|---|
| Native Resolution | 1920 × 1080 |
| Resolution Name | Full HD / 1080p |
| Pixel Density | 81 ppi |
| Pixel Pitch | 0.311 mm |
Picture Quality & Color
9
| Specification | Value |
|---|---|
| Panel Bit Depth | 8-bit (6-bit + FRC) |
| FRC | Yes |
| Display Colors | 16.7 million |
| Total Color Bits | 24-bit |
| Typical Brightness | 250 nits |
| HDR Support | Yes |
| HDR Formats |
|
| HDR10 | Yes |
| sRGB Coverage | 99% |
DESK DISTANCE FIT
65cm
CompactIdeal FitWideUltra-Wide
Fills central vision comfortably at a typical desk distance — no head movement needed.
Refresh Rate, Response & Gaming
5
| Specification | Value |
|---|---|
| Refresh Rate Range | 48–100 Hz |
| Variable Refresh Rate | Yes |
| Adaptive-Sync | Adaptive-Sync technology |
| Black Stabilizer | Yes |
| Dynamic Action Sync | Yes |
Ports & Connectivity
7
| Specification | Value |
|---|---|
| HDMI Ports |
|
| HDMI Version | HDMI 1.4 |
| HDCP Support | Yes |
| USB-C Input | 1× USB-C 3.0 |
| USB-C Power Delivery | 15W |
| Audio Output | 3.5 mm (3-pole) |
| Headphone Output | Yes |
Ports & Connections
Audio, Camera, Network & Smart Features
2
| Specification | Value |
|---|---|
| Built-In Speakers | No |
| Built-In Camera | No |
Ergonomics & Stand
8
| Specification | Value |
|---|---|
| VESA Mount | Yes |
| Removable Stand | Yes |
| Height Adjustment | No |
| Tilt Adjustment | Yes |
| Forward Tilt | 5° |
| Backward Tilt | 21° |
| Swivel Adjustment | No |
| Pivot Adjustment | No |
Dimensions, Weight & Design
6
| Specification | Value |
|---|---|
| Dimensions With Stand | 610 × 452 × 170 mm |
| Dimensions Without Stand | 610 × 360 × 45.7 mm |
| Weight With Stand | 3.7 kg |
| Weight Without Stand | 3 kg |
| Stand Depth | 170 mm |
| Bezel Design | 3-Side virtually borderless Design |
Power & Operating Conditions 9
| Specification | Value |
|---|---|
| 110V Input Range | 100–120V |
| 220V Input Range | 220–240V |
| AC Frequency | 50–60 Hz |
| Sleep Consumption | 0.3 W |
| Off Consumption | 0.3 W |
| Operating Temperature | 0–40°C |
| Operating Humidity | 10–80% |
| Storage Temperature | -20–60°C |
| Storage Humidity | 5–85% |
Eye Care, Protection & Additional Features
7
| Specification | Value |
|---|---|
| Flicker-Free | Yes |
| Low Blue Light | Yes |
| Reader Mode | Yes |
| Monitor Management Software | LG Switch |
| AI Visual | Super Resolution+ |
| Smart Energy Saving | Yes |
| Additional Monitor Features |
|
Certifications, Standards & Licenses 1
| Specification | Value |
|---|---|
| VESA AdaptiveSync | Adaptive-Sync technology |
Included Accessories
1
| Specification | Value |
|---|---|
| HDMI Cable | Included |
Packaging Information 2
| Specification | Value |
|---|---|
| Package Dimensions | 690 × 440 × 142 mm |
| Package Weight | 4.94 kg |
⚡
Estimated Running Cost
Based on this product's rated power draw, not an independent lab measurement — actual usage varies with settings and content.
Daily₹0.72
Monthly₹21.60
Annually₹263
Draws less power than 83% of the 701 comparable displays we track.