Convert IST to EST: India Time to Eastern Time Conversion
Indian Standard Time to Eastern Time is a long conversion — India is 10.5 hours ahead of US Eastern (9.5 during US DST) and uses a half-hour offset (UTC+5:30), which trips up many calculators.
Time Zone Overview
IST (UTC+5:30)
India uses IST year-round — no DST. The :30 offset matters.
EST/EDT
Eastern is UTC-5 (winter), UTC-4 (summer).
Conversion Formula
EST = IST − 10.5 hours (winter) / − 9.5 hours (US summer)
Conversion Examples
Winter: 12:00 PM IST → 1:30 AM EST (same day)
US summer: 12:00 PM IST → 2:30 AM EDT
Quick Reference Table (IST → EST)
| India (IST) | US Eastern |
|---|---|
| 9:00 AM | 10:30 PM (prev day) |
| 12:00 PM | 1:30 AM |
| 3:00 PM | 4:30 AM |
| 6:00 PM | 7:30 AM |
| 9:00 PM | 10:30 AM |
| 11:30 PM | 1:00 PM |
Common Use Cases
- US–India outsourcing and engineering handoffs
- Family calls between the US and India
- Scheduling with Bangalore teams
Frequently Asked Questions
How far ahead is India from US Eastern?
10.5 hours (9.5 in US summer) — note the half-hour offset.
Why is India UTC+5:30 not +5?
Historical solar-time alignment; the :30 keeps clocks close to local noon.
If it's noon IST, what time is it in NY?
1:30 AM EST (winter) or 2:30 AM EDT (summer).
Does India observe DST?
No.
How do I convert EST to IST?
Add 10.5 (winter) or 9.5 (summer) hours.
Use our world clock for live IST and Eastern times.