Convert PST to GMT: Pacific Time to Greenwich Mean Time
Converting US Pacific Time (PST) to Greenwich Mean Time (GMT) is essential for anyone bridging the US West Coast with Europe, Africa, or UTC-based systems. Pacific is the furthest US zone from GMT — the gap is large, so planning matters. Here's the breakdown.
Time Zone Overview
Pacific Time (PST/PDT)
US Pacific Time is PST (UTC−8) in winter and PDT (UTC−7) during US daylight saving.
Greenwich Mean Time (GMT)
GMT is UTC+0 in winter; the UK uses BST (UTC+1) in summer.
Time Difference
US winter (PST) / UK winter (GMT): GMT is 8 hours ahead of PST.
US summer (PDT) / UK summer (BST): GMT (BST) is 7 hours ahead of PDT.
Conversion Formula
GMT = PST + 8 hours (winter) / PST + 7 hours (summer)
Quick Reference Table (PST → GMT/BST)
| PST (winter) | GMT | PDT (summer) | BST (London summer) |
|---|---|---|---|
| 7:00 AM | 3:00 PM | 7:00 AM | 2:00 PM |
| 9:00 AM | 5:00 PM | 9:00 AM | 4:00 PM |
| 12:00 PM | 8:00 PM | 12:00 PM | 7:00 PM |
| 3:00 PM | 11:00 PM | 3:00 PM | 10:00 PM |
| 5:00 PM | 1:00 AM (next day) | 5:00 PM | 12:00 AM (next day) |
| 8:00 PM | 4:00 AM (next day) | 8:00 PM | 3:00 AM (next day) |
Common Use Cases
- Scheduling London–Los Angeles / San Francisco calls
- Tech teams in Silicon Valley coordinating with EU offices
- Converting US West Coast product launches to GMT for EMEA
- Following Pacific-time earnings/events from Europe
Frequently Asked Questions
What is the time difference between PST and GMT?
GMT is 8 hours ahead of PST in winter, 7 in summer (US on PDT, UK on BST).
If it's 9 AM PST, what time is it in London?
5:00 PM GMT (winter) or 4:00 PM BST (summer).
Is PST the same as PT?
PT is the generic term; PST is the winter instance (UTC−8), PDT the summer one (UTC−7).
How do I convert PDT to GMT?
Add 7 hours in summer. In winter (PST), add 8 hours.
Why is the Pacific gap so big?
Los Angeles is the westernmost major US zone, so it sits ~8 hours behind GMT — the largest US–Europe offset.
Use our world clock and meeting planner for live conversion.