Houston to IST time conversion
IST is 10 hours 30 minutes ahead of Houston. After the next clock change (): IST is 11 hours 30 minutes ahead of Houston.
Time difference with your location
Houston is 5 hours behind UTC. Compare with your local time →
Choose a date and time
Choose the local time in Houston to convert it to IST on that date.
Skipped clock-change times are unavailable; a repeated time uses its first occurrence.
24-hour conversion chart · Houston → IST
This table converts each hour in Houston to IST on 2026-10-21.
- Working hours
- Outside working hours
- Night hours
| Houston | IST | Shared working hours |
|---|---|---|
| 00:0012:00 AM | 10:3010:30 AM | |
| 01:001:00 AM | 11:3011:30 AM | |
| 02:002:00 AM | 12:3012:30 PM | |
| 03:003:00 AM | 13:301:30 PM | |
| 04:004:00 AM | 14:302:30 PM | |
| 05:005:00 AM | 15:303:30 PM | |
| 06:006:00 AM | 16:304:30 PM | |
| 07:007:00 AM | 17:305:30 PM | |
| 08:008:00 AM | 18:306:30 PM | |
| 09:009:00 AM | 19:307:30 PM | |
| 10:0010:00 AM | 20:308:30 PM | |
| 11:0011:00 AM | 21:309:30 PM | |
| 12:0012:00 PM | 22:3010:30 PM | |
| 13:001:00 PM | 23:3011:30 PM | |
| 14:002:00 PM | 00:3012:30 AM +1 day | |
| 15:003:00 PM | 01:301:30 AM +1 day | |
| 16:004:00 PM | 02:302:30 AM +1 day | |
| 17:005:00 PM | 03:303:30 AM +1 day | |
| 18:006:00 PM | 04:304:30 AM +1 day | |
| 19:007:00 PM | 05:305:30 AM +1 day | |
| 20:008:00 PM | 06:306:30 AM +1 day | |
| 21:009:00 PM | 07:307:30 AM +1 day | |
| 22:0010:00 PM | 08:308:30 AM +1 day | |
| 23:0011:00 PM | 09:309:30 AM +1 day |
Quick conversion examples
These examples use Houston (UTC-5) and IST (UTC+5:30); choosing a date applies the local clock changes.
Conversion formula: IST = Houston + 10h30 · Houston + 11h30.
| Houston | IST |
|---|---|
| 6:00 AM Houston | = 4:30 PM IST |
| 7:00 AM Houston | = 5:30 PM IST |
| 8:00 AM Houston | = 6:30 PM IST |
| 9:00 AM Houston | = 7:30 PM IST |
| 10:00 AM Houston | = 8:30 PM IST |
| 12:00 PM Houston | = 10:30 PM IST |
| 3:00 PM Houston | = 1:30 AM IST (+1 day) |
| 5:00 PM Houston | = 3:30 AM IST (+1 day) |
| 6:00 PM Houston | = 4:30 AM IST (+1 day) |
| 8:00 PM Houston | = 6:30 AM IST (+1 day) |
Overlapping meeting hours
The 08:00–18:00 working days in Houston and IST do not overlap on 2026-10-21.
Clock changes on both sides, 2026–2028
Houston and IST have the following local clock changes in 2026–2028; all times in the table are local to that side.
| Year | Houston | IST |
|---|---|---|
| 2026 | · 02:00 → 03:00 · 02:00 → 01:00 | No clock changes; UTC+5:30 all year. |
| 2027 | · 02:00 → 03:00 · 02:00 → 01:00 | No clock changes; UTC+5:30 all year. |
| 2028 | · 02:00 → 03:00 · 02:00 → 01:00 | No clock changes; UTC+5:30 all year. |
At the start of 2026, IST is 11 hours 30 minutes ahead of Houston. The difference changes during the following periods.
- From 2026-03-08 03:00 Houston until 2026-11-01 01:00 Houston, IST is 10 hours 30 minutes ahead of Houston.
- From 2027-03-14 03:00 Houston until 2027-11-07 01:00 Houston, IST is 10 hours 30 minutes ahead of Houston.
- From 2028-03-12 03:00 Houston until 2028-11-05 01:00 Houston, IST is 10 hours 30 minutes ahead of Houston.
Frequently asked questions
What time is 9 AM Houston in IST?
9:00 AM Houston = 7:30 PM IST, using UTC-5 and UTC+5:30. Choose a date above for the seasonal local time.
Does the time difference between Houston and IST change during the year?
Yes. During 2026–2028: IST is 10 hours 30 minutes ahead of Houston; IST is 11 hours 30 minutes ahead of Houston. The clock-change table gives the dates for both sides.
How do I tell whether it is day or night in IST?
Read the IST clock above: this guide counts 06:00–18:00 local time as daytime and the rest as nighttime, without using sunrise and sunset.
What is the best time to call between Houston and IST?
The 08:00–18:00 working days in Houston and IST do not overlap.
What is the time difference between Houston and IST now?
Right now, IST is 10 hours 30 minutes ahead of Houston. Conversion formula: IST = Houston + 10h30 · Houston + 11h30.