Mumbai
London
Convert IST to BST
India Standard Time to British Summer Time — London is 4.5 hours behind Mumbai
Quick Facts
Time Difference
-4.5 hours
IST Full Name
India Standard Time
BST Full Name
British Summer Time
IST to BST Conversion Table
Related Conversions
About IST and BST Time Zones
IST (India Standard Time) is UTC+5:30 and covers cities like Mumbai, Delhi, Bangalore. BST (British Summer Time) is UTC+1 and covers cities like London, Edinburgh, Cardiff.
When it's 12:00 PM (noon) in Mumbai (IST), it's 7:30 AM in London (BST). The time difference between IST and BST is 4.5 hours — London is behind Mumbai.
The best meeting window is 9:00 AM–0.5:00 PM IST (1.5:00 PM–5:00 PM BST).
Use our world clock tool to compare Mumbai and London with a visual timeline, or browse more timezone conversions.
Frequently Asked Questions
What is the time difference between IST and BST?
London (BST) is 4.5 hours behind Mumbai (IST). The offset is -4.5 hours.
Is BST ahead or behind IST?
BST is 4.5 hours behind IST. IST is UTC+5:30 and BST is UTC+1.
When it's 12:00 PM in Mumbai, what time is it in London?
When it's 12:00 PM (noon) in Mumbai (IST), it's 7:30 AM in London (BST).
When it's 5:00 PM in Mumbai, what time is it in London?
When it's 5:00 PM in Mumbai (IST), it's 12:30 PM in London (BST).