Convert BST to GMT
Compare British Summer Time and Greenwich Mean Time with a live conversion table, meeting planner, and calendar export tools.
How BST Converts
British Summer Time is UTC+1 while Greenwich Mean Time is UTC+0, so BST is 1 hour ahead of GMT. This converter applies the correct offset automatically and updates for seasonal clock changes.
Hour-by-Hour Comparison Table
Use the visual hour-by-hour table to compare BST and GMT across the day. Scan working hours quickly, then export selected times with ICS download or add them to Google Calendar and Gmail.
Schedule Meetings Across Zones
Find suitable meeting times between British Summer Time and Greenwich Mean Time using the comparison grid and shared-hour view. Time calculations adjust automatically using the IANA timezone database for DST accuracy and historical changes.
BST (British Summer Time, UTC+1) is 1 hour ahead of GMT (Greenwich Mean Time, UTC+0), so converting from BST to GMT means subtracting one hour.
Looking for Bangladesh Standard Time? See /time-converter/bst-bangladesh-time-zone.
Looking for Bougainville Standard Time? See /time-converter/bst-bougainville-time-zone.
How to Convert BST to GMT
Open the BST to GMT converter: Go to https://www.xconvert.com/time-converter/bst-to-gmt-converter. The page opens with British Summer Time and Greenwich Mean Time in a visual comparison grid, which is useful when you are scheduling a call between the United Kingdom and GMT-based locations such as Ghana, Iceland, or Senegal.
Add relevant comparison cities: Click + Add City to add places that use British Summer Time or Greenwich Mean Time in real business workflows, such as London for UK operations, Accra for West African coordination, or Reykjavik for travel and remote team planning. This helps if you are comparing UK summer office hours with partners in GMT countries including Ghana, Ireland, or Ivory Coast.
Select the meeting window on the grid: Click Select, then drag across the British Summer Time row to highlight a time range in purple; you can drag the center to move it or use the side handles to resize it. For example, selecting 9:00 BST to 12:00 BST shows 8:00 GMT to 11:00 GMT, which is a practical morning overlap for customer support teams, agency calls, and cross-border project check-ins.
Export and share the result: After selecting a range, use the export options for ICS download, Google Calendar, Gmail, Copy to clipboard, or Share link. This is useful when a UK-based team wants to send a confirmed meeting slot to colleagues in GMT countries so everyone receives the correct local time in their own calendar system.
Understanding the BST to GMT Time Difference
British Summer Time is UTC+1, while Greenwich Mean Time is UTC+0. That means GMT is 1 hour behind BST, or viewed the other way, British Summer Time is 1 hour ahead of GMT.
In practical terms, converting from British Summer Time to Greenwich Mean Time is straightforward because you move the clock back by one hour. The most common examples are 9:00 BST = 8:00 GMT, 12:00 BST = 11:00 GMT, 15:00 BST = 14:00 GMT, and 18:00 BST = 17:00 GMT. These examples are especially useful for calendar invites, airline itinerary checks, and remote team handoffs between the United Kingdom and GMT-based countries.
British Summer Time is the daylight saving time abbreviation, and its standard-time counterpart is Greenwich Mean Time. Greenwich Mean Time is the standard-time abbreviation, and its daylight saving counterpart is British Summer Time. Because of that seasonal relationship, the BST-to-GMT difference matters during the part of the year when the UK is observing British Summer Time rather than standard time.
British Summer Time is used in Guernsey, Isle of Man, Jersey, and the United Kingdom. Greenwich Mean Time 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. This makes BST-to-GMT conversion relevant not only inside the British Isles, but also for trade, logistics, nonprofit work, aviation planning, and customer communication across West Africa and North Atlantic locations.
Best Times for Calls and Meetings Between BST and GMT
Because Greenwich Mean Time is 1 hour behind British Summer Time, morning and afternoon meetings are usually easy to arrange without forcing either side into late-night hours. A 9:00 BST start becomes 8:00 GMT, which works well for teams that begin early in GMT locations and need time afterward for follow-up emails or same-day approvals.
A late-morning UK meeting is often one of the most convenient options. For example, 12:00 BST = 11:00 GMT, which fits normal office hours for finance, legal, education, and public-sector coordination between the United Kingdom and GMT countries such as Ghana, Ireland, and Iceland. This slot is also practical for travel planning because airport operations, hotel desks, and regional support teams are typically active on both sides.
Mid-afternoon British Summer Time still remains within standard business hours in Greenwich Mean Time locations. 15:00 BST = 14:00 GMT is a strong option for project reviews, agency-client presentations, and operational check-ins, especially when teams need enough time left in the day to act on decisions.
Early evening in British Summer Time can still be usable for Greenwich Mean Time participants, but it starts to push toward the end of the workday. 18:00 BST = 17:00 GMT can work for urgent handoffs, media deadlines, or end-of-day status calls, but it is less ideal for recurring meetings because GMT participants may be closing out their day.
If you want the broadest overlap, the most practical windows are usually built around the examples above: 9:00 BST / 8:00 GMT, 12:00 BST / 11:00 GMT, and 15:00 BST / 14:00 GMT. Those times support regular communication without requiring very early starts in GMT or evening calls in British Summer Time.
Frequently Asked Questions
What is the time difference between BST and GMT?
British Summer Time is 1 hour ahead of Greenwich Mean Time. In other words, GMT is 1 hour behind BST, so converting from BST to GMT means subtracting one hour from the British Summer Time clock.
When is 9 AM BST in GMT?
9:00 BST = 8:00 GMT. This is a common conversion for UK-based teams starting their workday and coordinating with contacts in GMT countries such as Ghana, Iceland, or Senegal.
Does the difference between British Summer Time and Greenwich Mean Time change during DST?
British Summer Time is the daylight saving time abbreviation, while Greenwich Mean Time is the standard-time abbreviation. That is why the BST-to-GMT relationship is specifically tied to the period when British Summer Time is in use, and during that period the difference is 1 hour.
What is the best meeting time between BST and GMT?
The best meeting times are usually during the shared business day, especially around 9:00 BST = 8:00 GMT, 12:00 BST = 11:00 GMT, and 15:00 BST = 14:00 GMT. These slots work well for recurring calls, client updates, and cross-border operations because both sides are still within normal office hours.
How do I convert BST to GMT quickly?
The fastest method is to subtract one hour from British Summer Time. For example, 12:00 BST becomes 11:00 GMT, and 18:00 BST becomes 17:00 GMT, which makes quick scheduling easier when sending invites or confirming deadlines.
Which countries use British Summer Time and which use Greenwich Mean Time?
British Summer Time is used in Guernsey, Isle of Man, Jersey, and the United Kingdom. Greenwich Mean Time 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, so the conversion is relevant across Europe, the British Isles, and several West African countries.
Is BST British Summer Time or Bangladesh Standard Time?
On this page, BST means British Summer Time (UTC+1). BST can also mean Bangladesh Standard Time (UTC+6), which is a different time zone entirely; for that meaning, use /time-converter/bst-bangladesh-time-zone.