Time difference
Houston to Kolkata Time Difference
Kolkata is 10 hours and 30 minutes ahead of Houston — when it's 12:00 PM in Houston, it's 10:30 PM in Kolkata. (Houston (America/Chicago, CDT); Kolkata (Asia/Kolkata, IST).) Below: live local times, the best hours for a call, a full conversion table, and exact daylight-saving dates.
Kolkata is 10 hours and 30 minutes ahead of Houston. Standard 9 AM–5 PM business hours in Houston and Kolkata do not overlap, so a live call needs one side outside normal hours. Clocks change on November 1, 2026, which briefly shifts the gap between Houston and Kolkata — the converter on this page always reflects the correct offset for the date you pick.
- When it's 9:00 AM in Houston, it's 7:30 PM in Kolkata.
- When it's 9:00 AM in Kolkata, it's 10:30 PM the previous day in Houston.
Kolkata is currently 10 hours and 30 minutes ahead of Houston.
Interactive converter
12:00PM
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Best times to meet
Standard 9 AM – 5 PM hours in Houston and Kolkata do not overlap. The least-bad options are an early start in one city or a late evening call in the other — for example a 7–8 AM meeting in Houston, or a 6–8 PM meeting in Kolkata.
Quick conversion table
| Houston | Kolkata |
|---|---|
| 12 AM | 10:30 AM |
| 1 AM | 11:30 AM |
| 2 AM | 12:30 PM |
| 3 AM | 1:30 PM |
| 4 AM | 2:30 PM |
| 5 AM | 3:30 PM |
| 6 AM | 4:30 PM |
| 7 AM | 5:30 PM |
| 8 AM | 6:30 PM |
| 9 AM | 7:30 PM |
| 10 AM | 8:30 PM |
| 11 AM | 9:30 PM |
| 12 PM | 10:30 PM |
| 1 PM | 11:30 PM |
| 2 PM | 12:30 AM (next day) |
| 3 PM | 1:30 AM (next day) |
| 4 PM | 2:30 AM (next day) |
| 5 PM | 3:30 AM (next day) |
| 6 PM | 4:30 AM (next day) |
| 7 PM | 5:30 AM (next day) |
| 8 PM | 6:30 AM (next day) |
| 9 PM | 7:30 AM (next day) |
| 10 PM | 8:30 AM (next day) |
| 11 PM | 9:30 AM (next day) |
Daylight saving
On November 1, 2026, Houston shifts for daylight saving. After that, Kolkata will be 11 hours and 30 minutes ahead of Houston (currently 10 hours and 30 minutes ahead of Houston). The converter and the tables above always reflect the correct offset for the date you pick.
- Houston is currently observing daylight saving time.
- Kolkata does not observe daylight saving time.
Frequently asked questions
- Is Kolkata ahead of or behind Houston?
- Kolkata is 10 hours and 30 minutes ahead of Houston.
- How many hours ahead of Houston is Kolkata?
- Kolkata is 10 hours and 30 minutes ahead of Houston.
- What time is 9 AM in Houston in Kolkata?
- 9:00 AM in Houston is 7:30 PM in Kolkata.
- What time is noon in Houston in Kolkata?
- 12:00 PM in Houston is 10:30 PM in Kolkata.
- What time is 5 PM in Houston in Kolkata?
- 5:00 PM in Houston is 3:30 AM the next day in Kolkata. Useful for end-of-day handoffs between the two offices.
- What time is 3 PM in Houston in Kolkata?
- 3:00 PM in Houston is 1:30 AM the next day in Kolkata.
- Is Houston currently observing daylight saving time?
- Houston is currently observing daylight saving time (summer time).
- Is Kolkata currently observing daylight saving time?
- Kolkata does not observe daylight saving time — its UTC offset stays the same all year.
- Do Houston and Kolkata observe daylight saving?
- On November 1, 2026, Houston shifts for daylight saving. After that, Kolkata will be 11 hours and 30 minutes ahead of Houston (currently 10 hours and 30 minutes ahead of Houston). The converter and the tables above always reflect the correct offset for the date you pick.
- When is the best time to call Kolkata from Houston?
- Houston and Kolkata business hours don't overlap. The closest options are early mornings in Houston or late evenings, when one side stretches outside 9–5.
- When is the best time to call Houston from Kolkata?
- Kolkata and Houston business hours don't overlap. The closest options are early mornings in Kolkata or late evenings, when one side stretches outside 9–5.
- Houston (CDT) to Kolkata (IST) — how do I convert quickly?
- Add 10 hours and 30 minutes to Houston local time to get Kolkata local time. Or use the converter at the top of this page — it stays accurate through daylight-saving changes automatically.
Other conversions
- Houston to New York
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