Convert IST to GMT
See the 5 hour 30 minute time difference, compare hours side by side, and schedule calls or meetings from IST to GMT.
How IST to GMT Works
IST is India Standard Time at UTC+5:30, while GMT is Greenwich Mean Time at UTC+0. This converter shows the exact 5 hour 30 minute difference and updates times automatically.
Hour-by-Hour Comparison Table
Use the visual grid and hour-by-hour table to compare IST and GMT across the day. Check overlapping business hours and export selected times with ICS download or Google Calendar.
Schedule Meetings Accurately
Plan meetings between India Standard Time and Greenwich Mean Time with automatic timezone adjustment. DST and historical timezone changes are tracked using the IANA timezone database.
How to Convert IST to GMT
Open the IST to GMT page: Go to https://www.xconvert.com/time-converter/ist-to-gmt-converter. The page loads with IST and GMT already set up in the comparison grid, which is useful when you are scheduling a client call between India and the United Kingdom or lining up support coverage across teams working on GMT time.
Add comparison cities: Click + Add City and search for cities that matter to your workflow, such as London for UK business hours, Dublin for teams in Ireland, or Mumbai for India-based operations, outsourcing, and engineering coordination. This makes the grid more practical for real work, especially if you manage finance, IT services, consulting, or customer support teams that need to see both regional office hours at once.
Select a time range on the grid: Click Select, then drag across the colored timeline in the IST row to highlight a meeting window in purple. For example, if you drag across 9:00 IST to 12:00 IST, the grid shows the matching GMT times as 4:00 GMT to 7:00 GMT; if you drag 15:00 IST to 18:00 IST, it maps to 10:00 GMT to 13:00 GMT, which is often more practical for daytime coordination with GMT-based teams.
Export and share the result: After selecting a range, use the export options that appear: ICS download, Google Calendar, Gmail, Copy to clipboard, or Share link. This is useful when you need to send a confirmed meeting block to a distributed team so everyone receives the appointment in their own calendar system without rechecking the IST to GMT conversion manually.
Understanding the IST to GMT Time Difference
IST means India Standard Time and uses UTC+5, while GMT means Greenwich Mean Time and uses UTC+0. The difference is -5 hours behind, so GMT is 5 hours behind IST; when it is 9:00 IST, it is 4:00 GMT, and when it is 18:00 IST, it is 13:00 GMT.
This gap matters most for business scheduling because a standard morning in India lands very early in GMT. The examples make that clear: 12:00 IST = 7:00 GMT and 15:00 IST = 10:00 GMT, so midday and afternoon in India usually align better with the start of the workday in GMT locations such as the United Kingdom, Ireland during GMT periods, Ghana, and Iceland.
DST can affect the relationship because IST is a standard-time abbreviation and its DST counterpart is IDT, while GMT is a standard-time abbreviation and its DST counterpart is IST. That means the difference changes during parts of the year when regions move away from standard time into their daylight-saving counterpart, so the exact month-by-month relationship depends on whether the location using the abbreviation is on standard time or daylight time at that point in the calendar.
The abbreviation itself also needs attention because IST is used in India, Ireland, and Israel, and GMT is used across countries including the United Kingdom, Ireland, Ghana, Iceland, and Senegal. For conversion work involving India, the relevant meaning here is India Standard Time, not Irish Standard Time or Israel Standard Time, which is why using a dedicated IST to GMT converter avoids ambiguity in international scheduling.
Best Times for Calls and Meetings Between IST and GMT
The most workable overlap usually comes from late morning to early evening in IST, because that corresponds to early morning through early afternoon in GMT. Using the fixed examples, 15:00 IST = 10:00 GMT and 18:00 IST = 13:00 GMT, which creates a practical daytime meeting block for teams handling software delivery, agency work, consulting, or cross-border operations between India and GMT-based offices.
By contrast, 9:00 IST = 4:00 GMT is too early for most standard office schedules in GMT countries. That makes early India morning better suited to asynchronous updates, handoff notes, ticket queues, or email summaries rather than live meetings.
A stronger live-call window appears around 12:00 IST to 18:00 IST, which corresponds to 7:00 GMT to 13:00 GMT based on the listed examples. This range can work well for sales check-ins, project standups, procurement calls, and remote hiring interviews where India-based teams need overlap with London, Dublin during GMT periods, or other GMT-region contacts.
If you need the least disruptive slot for both sides, aim closer to the middle of that overlap rather than the edges. For example, the example pair 15:00 IST = 10:00 GMT is often easier than 9:00 IST = 4:00 GMT, because it keeps the meeting inside normal business hours for GMT participants while still fitting into a standard afternoon block in India.
Frequently Asked Questions
What is the time difference between IST and GMT?
IST is UTC+5 and GMT is UTC+0, so the difference is -5 hours behind. In practical terms, GMT runs 5 hours behind India Standard Time, which means a workday in India starts much earlier from the perspective of GMT-based teams.
When is 9 AM IST in GMT?
9:00 IST = 4:00 GMT. This is an important conversion for global teams because a 9 AM start in India falls before normal office hours in many GMT locations, so it is usually better for background processing, overnight support review, or scheduled updates than for live calls.
When is 12 PM IST in GMT?
12:00 IST = 7:00 GMT. That timing can work for early-start teams in GMT regions, especially in industries such as operations, logistics, media, or support functions where staff may begin earlier than a standard 9-to-5 office schedule.
When is 3 PM IST in GMT?
15:00 IST = 10:00 GMT. This is one of the most useful conversion points for meetings because it places both sides comfortably into the business day, making it suitable for project reviews, vendor calls, and customer meetings between India and GMT-based offices.
When is 6 PM IST in GMT?
18:00 IST = 13:00 GMT. That creates a solid overlap for afternoon India meetings with lunchtime or early afternoon participants in GMT, which is often convenient for consulting teams, offshore delivery managers, and account teams working across both regions.
Does the difference between IST and GMT change during DST?
Yes, the relationship can change when locations move from standard time to their daylight-saving counterpart. IST is a standard-time abbreviation and its DST counterpart is IDT, while GMT is a standard-time abbreviation and its DST counterpart is IST, so the exact difference changes during the parts of the year when daylight saving is in effect rather than standard time.
What is the best meeting time between IST and GMT?
A practical live-meeting window is usually built around the example range from 12:00 IST to 18:00 IST, which corresponds to 7:00 GMT to 13:00 GMT. Within that span, 15:00 IST = 10:00 GMT is especially useful because it avoids the very early GMT hours while still staying inside a normal afternoon schedule in India.
Why is IST sometimes confusing in time conversion?
IST can refer to India, Ireland, or Israel, so the abbreviation is not unique worldwide. For accurate scheduling, especially in contracts, interviews, remote team coordination, and travel planning, you need to make sure IST is being used as India Standard Time when converting to GMT.