London to Kolkata — Time Difference
Live clocks · Full 24-hour table · United Kingdom → India
Time Difference: London vs Kolkata
Kolkata is 4 hours and 30 minutes ahead of London. London is in British Summer Time (GMT+1, UTC+1) and Kolkata is in India Standard Time (GMT+5:30, UTC+5:30).
Use the table below to find the equivalent Kolkata time for any hour in London. Click any row to see the full conversion page for that hour.
Business Hours — London to Kolkata
"Good" = both cities within business hours (9 AM–5 PM)
Full 24-Hour Table — London to Kolkata
Frequently Asked Questions
What is the time difference between London and Kolkata?
Kolkata is 4 hours and 30 minutes ahead of London. London uses British Summer Time (GMT+1, UTC+1) and Kolkata uses India Standard Time (GMT+5:30, UTC+5:30).
What time is it in Kolkata when it is 9 AM in London?
9 AM in London (GMT+1) equals 1:30 PM in Kolkata (GMT+5:30).
Is London ahead or behind Kolkata?
Kolkata is 4 hours and 30 minutes ahead of London.
What is the best time to call from London to Kolkata?
The best time to call from London to Kolkata is between 9 AM–1 PM London time, when Kolkata is also within normal working hours (9 AM–5 PM).
Time Zones
London
British Summer Time
GMT+1 · UTC+1
Kolkata
India Standard Time
GMT+5:30 · UTC+5:30
Reverse Conversion
Popular Comparisons