Convert KST to GMT
See the time difference between Korea Standard Time and Greenwich Mean Time, compare hours, and plan meetings across both zones.
How KST Converts
Korea Standard Time is UTC+9 and Greenwich Mean Time is UTC+0, so GMT is 9 hours behind KST. Enter any time to convert it instantly between both standard time zones.
Hour-by-Hour Time Table
Use the visual hour-by-hour table to compare KST and GMT across the day. Scan overlapping hours quickly and export selected times with ICS download or Google Calendar.
Schedule Meetings Accurately
Find practical meeting times between Korea Standard Time and Greenwich Mean Time with automatic timezone handling. Data is aligned with the IANA timezone database for accurate offset tracking and historical changes.
How to Convert KST to GMT
Open the KST to GMT converter: Go to https://www.xconvert.com/time-converter/kst-to-gmt-converter. The page is set up for Korea Standard Time and Greenwich Mean Time, which is useful when you are planning a call with colleagues in South Korea and partners in the United Kingdom, Ireland, Ghana, or Iceland that use GMT during standard time.
Add comparison cities if your schedule involves more than two regions: Click + Add City and search for places that matter to your workflow, such as Seoul for South Korean headquarters, London for UK media and finance coordination, or Accra for West Africa operations. This is especially helpful for logistics teams, game studios, electronics suppliers, and remote support teams that need to compare KST with GMT-based markets in one visual grid.
Drag across the grid to select a meeting window: Use the Select button if needed, then drag across the colored timeline on the KST row to highlight a range in purple; you can move the block by dragging the center or resize it with the side handles. For example, if you drag from 9:00 KST to 12:00 KST, the GMT row shows 0:00 GMT to 3:00 GMT, which immediately tells you that a Korean morning meeting lands at midnight to early morning in GMT and is usually poor for UK or West African business calls.
Export the selected time for your team: Once a range is selected, use the export options for ICS download, Google Calendar, Gmail, Copy to clipboard, or Share link. This is practical when a Seoul product team needs to send a confirmed handoff slot to a London client services team so every participant sees the meeting in their own local calendar without manually converting times.
Understanding the KST to GMT Time Difference
KST means Korea Standard Time and GMT means Greenwich Mean Time. KST is UTC+9, GMT is UTC+0, and GMT is 9 hours behind KST; put another way, KST is 9 hours ahead of GMT.
This difference is straightforward because KST does not observe DST. GMT is a standard-time abbreviation, and its daylight saving counterpart is BST, so the KST-to-GMT difference applies specifically when GMT is in use rather than BST.
The practical effect is easy to see in common conversions. 9:00 KST = 0:00 GMT, 12:00 KST = 3:00 GMT, 15:00 KST = 6:00 GMT, and 18:00 KST = 9:00 GMT. These examples show that much of the Korean daytime maps to very early morning hours in GMT, which matters for cross-border scheduling, overnight support coverage, and international project handoffs.
KST is used in North Korea and South Korea. GMT is used across a broad set of countries and territories including the United Kingdom, Ireland, Iceland, Ghana, Senegal, Sierra Leone, Liberia, Guinea, Guinea-Bissau, Mali, Mauritania, Togo, Gambia, Burkina Faso, Ivory Coast, Sao Tome and Principe, Saint Helena, Guernsey, Jersey, and the Isle of Man, so this conversion appears often in multinational trade, shipping, customer support, and public-sector coordination.
Best Times for Calls and Meetings Between KST and GMT
The biggest scheduling challenge is that standard office hours in Korea fall very early in GMT. Using the fixed examples, 9:00 KST = 0:00 GMT and 12:00 KST = 3:00 GMT, so a typical Korean morning is midnight to early morning for GMT participants, which is rarely suitable for live meetings unless one side is working an overnight shift.
The most workable overlap usually appears later in the KST day. 15:00 KST = 6:00 GMT and 18:00 KST = 9:00 GMT, so late afternoon to early evening in Korea aligns with early morning in GMT. That pattern can work for industries that start early, such as financial news desks, aviation operations, cloud infrastructure teams, and global customer support groups.
For business calls between Seoul and London during periods when London is on GMT rather than BST, a 15:00 KST to 18:00 KST window is often the most realistic starting point because it corresponds to 6:00 GMT to 9:00 GMT. It is also useful for organizations coordinating with GMT-based teams in Accra, Reykjavik, Dublin, or Dakar, where early morning check-ins can support same-day approvals, shipment updates, and engineering handoffs before the Korean workday ends.
If your team needs a recurring slot, the visual grid helps you avoid picking a time that looks normal in Korea but lands too early in GMT. A Korean team proposing 9:00 KST is really proposing 0:00 GMT, while a later slot such as 18:00 KST becomes 9:00 GMT, which is far more practical for standard business communication.
Frequently Asked Questions
What is the time difference between KST and GMT?
KST is 9 hours ahead of GMT, and GMT is 9 hours behind KST. In UTC terms, KST is UTC+9 and GMT is UTC+0, so the gap is fixed when both abbreviations are being used as stated.
When is 9 AM KST in GMT?
9:00 KST = 0:00 GMT. This means a 9 AM start in Korea falls at midnight in GMT, which is usually too early for standard office meetings in places such as the United Kingdom, Ireland, Ghana, or Iceland when they are observing GMT.
When is 12 PM KST in GMT?
12:00 KST = 3:00 GMT. That places a Korean lunchtime meeting in the middle of the night or very early morning for GMT participants, so it is more suitable for asynchronous updates than for live calls.
When is 3 PM KST in GMT?
15:00 KST = 6:00 GMT. This is one of the more usable conversion points for live coordination because it lets a Korean afternoon align with an early GMT morning, which can work for operations teams, support desks, and early-start business units.
When is 6 PM KST in GMT?
18:00 KST = 9:00 GMT. This is often the clearest overlap for normal business communication because it reaches a conventional morning hour in GMT while still staying within the Korean early evening.
Does the difference between KST and GMT change during DST?
KST itself does not observe DST, so the KST side remains stable all year. GMT is a standard-time abbreviation, and its daylight saving counterpart is BST, which means the stated 9-hour difference applies when GMT is in effect rather than BST.
Which months does the KST to GMT difference change?
The KST to GMT difference does not change on the Korean side because KST stays on the same standard time year-round. The difference changes only during periods when locations that otherwise use GMT switch to BST, since GMT and BST are not the same abbreviation and do not represent the same seasonal clock setting.
What is the best meeting time between KST and GMT?
The most practical live-meeting window from the examples given is usually 15:00 KST to 18:00 KST, which equals 6:00 GMT to 9:00 GMT. Earlier Korean times such as 9:00 KST or 12:00 KST convert to 0:00 GMT and 3:00 GMT, making them poor choices for normal office-hour meetings in GMT regions.
Which countries use KST and which countries use GMT?
KST is used in North Korea and South Korea. GMT is used in Burkina Faso, Gambia, Ghana, Guernsey, Guinea, Guinea-Bissau, Iceland, Ireland, Isle of Man, Ivory Coast, Jersey, Liberia, Mali, Mauritania, Saint Helena, Sao Tome and Principe, Senegal, Sierra Leone, Togo, and the United Kingdom, making this conversion relevant for diplomacy, shipping, technology outsourcing, and international customer communication.