The time difference between Chicago and Kolkata is 11 hours and 30 minutes. When it is 12:00 noon in Chicago, it is 23:30 in Kolkata. Chicago uses the America/Chicago time zone (UTC-6), while Kolkata uses Asia/Kolkata (UTC+5:30).
With a 11 hours and 30 minutes gap, there is no standard business-hours overlap between Chicago and Kolkata. One party will need to adjust their schedule. Early mornings in Kolkata or late evenings in Chicago tend to be the most practical compromise.
Use this table to quickly convert any hour from Chicago time to Kolkata time. Rows highlighted in green indicate overlapping business hours in both cities.
| Chicago | Kolkata | |
|---|---|---|
| 00:00 | 11:30 | Night |
| 01:00 | 12:30 | Night |
| 02:00 | 13:30 | Night |
| 03:00 | 14:30 | Night |
| 04:00 | 15:30 | Night |
| 05:00 | 16:30 | Night |
| 06:00 | 17:30 | |
| 07:00 | 18:30 | |
| 08:00 | 19:30 | |
| 09:00 | 20:30 | |
| 10:00 | 21:30 | |
| 11:00 | 22:30 | |
| 12:00 | 23:30 | |
| 13:00 | 00:30 (+1 day) | |
| 14:00 | 01:30 (+1 day) | |
| 15:00 | 02:30 (+1 day) | |
| 16:00 | 03:30 (+1 day) | |
| 17:00 | 04:30 (+1 day) | |
| 18:00 | 05:30 (+1 day) | |
| 19:00 | 06:30 (+1 day) | |
| 20:00 | 07:30 (+1 day) | |
| 21:00 | 08:30 (+1 day) | |
| 22:00 | 09:30 (+1 day) | Night |
| 23:00 | 10:30 (+1 day) | Night |
Neither Chicago nor Kolkata is currently observing daylight saving time. If either city observes DST, the time difference will change by 1 hour when DST begins or ends. Always double-check before scheduling across these time zones during March–April and October–November.
The time difference is 11 hours and 30 minutes. Kolkata is 11 hours and 30 minutes ahead of Chicago.
It can. If either Chicago or Kolkata observes daylight saving time, the gap will shift by 1 hour during the transition periods (typically March–April and October–November).
There is no ideal window during standard business hours. Consider scheduling at the edges — early morning for the city that is ahead and late afternoon for the city that is behind.
Add 11 hours and 30 minutes to Chicago time to get Kolkata time. Use the hour-by-hour table above for a quick reference.
For sunrise and sunset data, visit TheSunsetTimes.com. For detailed DST schedules, see DaylightSavingTime.info.