Time zone converter
IST to GMT
Convert India Time — Mumbai to London Time — GMT/BST — fast, accurate, and daylight-saving aware.
When it's 9:00 AM in Mumbai, it's 4:30 AM in London. London is 4½ hours behind Mumbai. Use the converter above to turn any IST time into GMT, or scan the hour-by-hour table below for the full day.
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India Time — Mumbai ·
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London Time — GMT/BST ·
Convert a specific timein Mumbai → — in London
IST to GMT at a glance
9:00 AM IST
4:30 AM
GMT · London
12:00 PM IST
7:30 AM
GMT · London
5:00 PM IST
12:30 PM
GMT · London
Planning a meeting between Mumbai and London
Planning a call between Mumbai and London? The best overlap during a standard 9-to-5 workday runs 1:30 PM–5:00 PM IST (9:00 AM–12:30 PM GMT). Aim for that window to reach both sides during business hours.
Hour-by-hour: Mumbai to London
A full day mapped from IST to GMT.
Frequently asked
Is London ahead of or behind Mumbai?
London is 4½ hours behind Mumbai.
What is 12:00 PM IST in GMT?
12:00 PM in Mumbai is 7:30 AM in London.
Does this converter account for daylight saving time?
Yes. Conversions use the IANA time zone database, so IST and GMT automatically reflect the correct daylight-saving offset for the current date.