Convert BST to PST
See the 9-hour time difference between BST and PST, compare hours side by side, and plan meetings across time zones.
How to Convert BST to PST
Open the BST to PST converter: Go to https://www.xconvert.com/time-converter/bst-to-pst-converter to load a visual comparison page with BST and PST already set up as reference rows. This page is useful when you are scheduling a call between London-based teams and colleagues on the US West Coast, such as a product review with engineers in San Francisco or a media planning session with partners in Los Angeles.
Add comparison cities if your workflow spans more than two regions: Click + Add City and search for places such as London, Los Angeles, San Francisco, or Vancouver to compare specific business hubs that operate on these time standards. This is especially helpful for industries like software, gaming, film, e-commerce, and venture capital, where UK teams often coordinate with California offices and Pacific-region partners.
Drag across the grid to select a meeting window: Click Select if needed, then drag across the BST row to highlight a time range in purple, such as 9:00 AM to 11:00 AM BST, and the PST row will immediately show the matching local time. In practical terms, 9:00 AM BST = 1:00 AM PST and 11:00 AM BST = 3:00 AM PST, which quickly shows that a normal UK morning is too early for a same-day live meeting with Pacific Time participants.
Export the selected time for sharing: After selecting a workable slot, use the export options shown on the page: ICS download, Google Calendar, Gmail, Copy to clipboard, or Share link. This is useful when a UK operations team finds a narrow overlap such as late afternoon BST and wants to send a calendar-ready invite to a Seattle or Silicon Valley team so everyone sees the meeting in local time automatically.
Understanding the BST to PST Time Difference
BST (British Summer Time) is UTC+1, while PST (Pacific Standard Time) is UTC-8, so the standard BST-to-PST difference is 9 hours, with BST 9 hours ahead of PST. That means when it is 9:00 AM in BST, it is 12:00 AM in PST, and when it is 5:00 PM in BST, it is 8:00 AM in PST.
The complication is that these labels do not stay active all year. BST is the UK’s daylight saving time and runs from the last Sunday in March to the last Sunday in October; in 2025, BST begins on 30 March 2025 and ends on 26 October 2025. PST is the standard-time label for the US and Canada’s Pacific zone and is used roughly from early November to mid-March; in 2025, Pacific Time switches from PST to PDT on 9 March 2025, and returns to PST on 2 November 2025.
Because the UK and North America change clocks on different dates, the BST-to-PST difference is not stable across every week of the year if you are comparing actual local clocks. During the period when the UK is on BST and the US West Coast is on PDT (UTC-7), the real difference is 8 hours, not 9. During the short transition windows—30 March to 8 March does not occur in calendar order, so the important practical windows are 9 March to 29 March and 26 October to 1 November in 2025—the offset can temporarily differ from what users expect if they search only for “BST to PST” instead of checking the actual date.
For real scheduling, the date matters more than the abbreviation. If you are booking a meeting for April, May, June, July, August, or September, London is usually on BST while California is usually on PDT, so London is 8 hours ahead of Pacific local time. If you are planning around late October or early November, or checking archived timestamps from winter, confirm whether the Pacific side is using PST or PDT before sending invites.
Best Times for Calls and Meetings Between BST and PST
The most practical overlap between UK business hours and US Pacific business hours is usually late afternoon in BST and early morning in PST. A strong working window is 4:00 PM to 6:00 PM BST = 7:00 AM to 9:00 AM PST, which gives UK teams enough time to finish morning work and lets West Coast teams join shortly after starting their day. This slot is commonly used for SaaS standups, agency-client reviews, and cross-Atlantic sales coordination.
Another useful option is 5:00 PM to 7:00 PM BST = 8:00 AM to 10:00 AM PST. This tends to work well for structured meetings such as sprint planning, legal reviews, or executive check-ins because Pacific participants are fully online while UK participants are still within or just at the edge of normal office hours. For companies with offices in London, San Francisco, Seattle, San Diego, or Vancouver, this is often the best compromise window.
Earlier BST times are usually poor for live collaboration with PST. For example, 9:00 AM BST = 12:00 AM PST, 12:00 PM BST = 3:00 AM PST, and 2:00 PM BST = 5:00 AM PST, so a standard UK morning overlaps with the middle of the night on the US West Coast. That is why many transatlantic teams push real-time meetings into the UK late afternoon and use asynchronous tools like Slack, email, Jira, or Notion for everything else.
If you are scheduling around actual seasonal local time rather than the fixed abbreviations, remember that much of the summer business overlap is effectively BST to PDT, not BST to PST. In that common summer pattern, 4:00 PM BST = 8:00 AM PDT and 6:00 PM BST = 10:00 AM PDT, which is slightly more comfortable for both sides than the fixed BST-to-PST conversion suggests. This matters for sectors such as fintech, cloud infrastructure, digital marketing, and entertainment, where London and California teams often need recurring weekly calls.
Frequently Asked Questions
What is the time difference between BST and PST?
BST is 9 hours ahead of PST because BST = UTC+1 and PST = UTC-8. So if it is 6:00 PM in BST, it is 9:00 AM in PST on the same day. This fixed difference is accurate when you are specifically comparing the abbreviations BST and PST, but real local clocks may differ seasonally if the Pacific side is actually observing PDT.
When is 9 AM BST in PST?
9:00 AM BST = 12:00 AM PST. In other words, a 9 AM start in the UK corresponds to midnight at the start of the same calendar day on the US West Coast when using PST. This is why UK morning meetings are rarely suitable for California-based teams unless the Pacific participants are working unusual hours.
Does the difference between BST and PST change during DST?
Yes, in practical scheduling it can change because the Pacific region does not use PST all year. BST itself is already a daylight-saving time used in the UK, while the US West Coast switches between PST (UTC-8) and PDT (UTC-7), with PDT beginning on 9 March 2025 and PST returning on 2 November 2025. During most of the UK summer, if London is on BST and California is on PDT, the real local difference is 8 hours, not 9.
What is the best meeting time between BST and PST?
The best shared window is usually 4:00 PM to 6:00 PM BST, which converts to 7:00 AM to 9:00 AM PST. That range works for cross-border product teams, consulting calls, and client handoffs because it avoids forcing UK staff into evening meetings or Pacific teams into pre-dawn starts. If you need a slightly later Pacific start, 5:00 PM BST = 8:00 AM PST is often the easiest single meeting time.
Why is it hard to schedule meetings between the UK and the US West Coast?
The challenge comes from the large westward offset: BST is 9 hours ahead of PST, so most UK office hours fall before the Pacific workday begins. For example, 1:00 PM BST = 4:00 AM PST, which leaves only a narrow overlap near the UK’s late afternoon. This affects remote software teams, ad agencies, investment firms, and customer support operations that need same-day communication between London and California.
Is BST the same as UK time all year?
No. The UK uses GMT (UTC+0) in winter and BST (UTC+1) in summer. In 2025, the UK switches to BST on 30 March 2025 and returns to GMT on 26 October 2025, so any conversion involving London should always be checked against the actual date. This is especially important for recurring meetings, flight planning, and financial market coordination.
How do I convert BST to PST accurately for a specific date?
Use the converter’s date picker first, then drag across the BST timeline to highlight the exact hour range you want to compare. This matters because a meeting in April may effectively be BST-to-Pacific daylight time, while a meeting in November may be BST no longer at all because the UK has returned to GMT. For recurring meetings across quarters, checking each date on the grid helps avoid one-hour mistakes during DST transition weeks.