Mumbai
London
Convert IST to GMT
India Standard Time to Greenwich Mean Time — London is 4.5 hours behind Mumbai
Quick Facts
Time Difference
-4.5 hours
IST Full Name
India Standard Time
GMT Full Name
Greenwich Mean Time
IST to GMT Conversion Table
Related Conversions
About IST and GMT Time Zones
IST (India Standard Time) is UTC+5:30 and covers cities like Mumbai, Delhi, Bangalore. GMT (Greenwich Mean Time) is UTC+0 and covers cities like London, Dublin, Lisbon.
When it's 12:00 PM (noon) in Mumbai (IST), it's 7:30 AM in London (GMT). The time difference between IST and GMT is 4.5 hours — London is behind Mumbai.
The best meeting window is 9:00 AM–11.5:00 AM IST (2.5:00 PM–5:00 PM GMT).
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 GMT?
London (GMT) is 4.5 hours behind Mumbai (IST). The offset is -4.5 hours.
Is GMT ahead or behind IST?
GMT is 4.5 hours behind IST. IST is UTC+5:30 and GMT 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 (GMT).
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 (GMT).