London
Mumbai
Convert BST to IST
British Summer Time to India Standard Time — Mumbai is 4.5 hours ahead of London
Quick Facts
Time Difference
+4.5 hours
BST Full Name
British Summer Time
IST Full Name
India Standard Time
BST to IST Conversion Table
Related Conversions
About BST and IST Time Zones
BST (British Summer Time) is UTC+1 and covers cities like London, Edinburgh, Cardiff. IST (India Standard Time) is UTC+5:30 and covers cities like Mumbai, Delhi, Bangalore.
When it's 12:00 PM (noon) in London (BST), it's 4:30 PM in Mumbai (IST). The time difference between BST and IST is 4.5 hours — Mumbai is ahead of London.
The best meeting window is 1.5:00 PM–5:00 PM BST (9:00 AM–0.5:00 PM IST).
Use our world clock tool to compare London and Mumbai with a visual timeline, or browse more timezone conversions.
Frequently Asked Questions
What is the time difference between BST and IST?
Mumbai (IST) is 4.5 hours ahead of London (BST). The offset is +4.5 hours.
Is IST ahead or behind BST?
IST is 4.5 hours ahead of BST. BST is UTC+1 and IST is UTC+5:30.
When it's 12:00 PM in London, what time is it in Mumbai?
When it's 12:00 PM (noon) in London (BST), it's 4:30 PM in Mumbai (IST).
When it's 5:00 PM in London, what time is it in Mumbai?
When it's 5:00 PM in London (BST), it's 9:30 PM in Mumbai (IST).