London
Mumbai
Convert GMT to IST
Greenwich Mean Time to India Standard Time — Mumbai is 4.5 hours ahead of London
Quick Facts
Time Difference
+4.5 hours
GMT Full Name
Greenwich Mean Time
IST Full Name
India Standard Time
GMT to IST Conversion Table
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About GMT and IST Time Zones
GMT (Greenwich Mean Time) is UTC+0 and covers cities like London, Dublin, Lisbon. IST (India Standard Time) is UTC+5:30 and covers cities like Mumbai, Delhi, Bangalore.
When it's 12:00 PM (noon) in London (GMT), it's 4:30 PM in Mumbai (IST). The time difference between GMT and IST is 4.5 hours — Mumbai is ahead of London.
The best meeting window is 2.5:00 PM–5:00 PM GMT (9:00 AM–11.5:00 AM 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 GMT and IST?
Mumbai (IST) is 4.5 hours ahead of London (GMT). The offset is +4.5 hours.
Is IST ahead or behind GMT?
IST is 4.5 hours ahead of GMT. GMT 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 (GMT), 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 (GMT), it's 9:30 PM in Mumbai (IST).