Convert BST to IST Time - London to Mumbai Converter

Q: How many hours ahead is IST from BST?

India Standard Time (IST) is 4 hours and 30 minutes ahead of British Summer Time (BST), or 5 hours and 30 minutes ahead of Greenwich Mean Time (GMT). When it's 12:00 PM BST in London, it's 4:30 PM IST in Mumbai.

Q: What time is it in India when it's 9 AM in London?

When it's 9:00 AM BST in London, it's 1:30 PM IST in India. Popular conversions include 8 AM London = 12:30 PM India, 12 PM London = 4:30 PM India, and 6 PM London = 10:30 PM India. This 4.5-hour difference makes the afternoon in London evening in India.

Q: What time is it in London when it's 9 AM in Mumbai?

When it's 9:00 AM IST in Mumbai, it's 4:30 AM BST in London. Key conversions include 12 PM Mumbai = 7:30 AM London, 3 PM Mumbai = 10:30 AM London, and 6 PM Mumbai = 1:30 PM London. Subtract 4.5 hours from India time to get London time.

Q: Which cities use BST and IST time zones?

BST (British Summer Time) covers UK cities like London, Manchester, Birmingham, Glasgow, and Edinburgh. IST (India Standard Time) includes all Indian cities such as Mumbai, Delhi, Bangalore, Chennai, and Kolkata. The entire UK switches between GMT and BST seasonally, while all of India uses IST year-round.

Q: When does BST start and end in 2025?

BST begins on March 30, 2025, at 1:00 AM and ends on October 26, 2025, at 2:00 AM. During BST (March-October), India is 4.5 hours ahead of the UK. During GMT (October-March), India is 5.5 hours ahead. India never changes its time zone and stays at UTC+5:30 throughout the year.

Q: What's the best time for business meetings between UK and India?

The optimal meeting window is 9:00 AM to 1:30 PM BST, corresponding to 1:30 PM to 6:00 PM IST. This allows excellent overlap between UK business hours (9 AM-5 PM) and Indian business hours (9 AM-6 PM). Avoid scheduling before 9 AM BST or after 1:30 PM BST for comfortable timing on both sides.

Q: How does UK daylight saving time affect BST to IST conversion?

The UK switches between GMT (winter) and BST (summer), changing the time difference with India. During the BST period (March-October), India is 4.5 hours ahead. During the GMT period (October-March), India is 5.5 hours ahead. India never observes daylight saving time, so IST remains constant at UTC+5:30 throughout the year.

Q: What's the easiest way to convert BST to IST quickly?

The fastest method is to add 4.5 hours to UK time during summer (BST) or 5.5 hours during winter (GMT). For smartphone users, add "Mumbai" to your world clock widget or simply ask Siri/Google Assistant, "What time is it in India?" For instant web conversion, Google iformat.io and click on bst to ist.

Convert British Summer Time (BST) to India Standard Time (IST, UTC+5.5) with our professional time zone converter. Designed for international business meetings between London to Mumbai, this tool provides real-time conversion, optimal meeting time suggestions, business hours comparison, and 24-hour conversion tables. Features include live clock displays, meeting scheduler, time zone maps, and daylight saving time handling. Perfect for international business coordination, global team management, and cross-border communication. No registration required - works instantly on all devices with offline capability.

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BST

British Summer Time

Current Time

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🕐

IST

India Standard Time

Current Time

Converted Time

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Time Difference

Your Local Time

UTC Time

BST to IST Time Zone Difference

India Standard Time is 4 hours and 30 minutes ahead of British Summer Time

Always up-to-date and accurate

24-Hour BST to IST Conversion Chart

Complete hourly conversion for British Summer Time to India Standard Time

British Summer Time	India Standard Time	24-Hour BST	24-Hour IST
12:00 AM	4:30 AM	00:00	04:30
1:00 AM	5:30 AM	01:00	05:30
2:00 AM	6:30 AM	02:00	06:30
3:00 AM	7:30 AM	03:00	07:30
4:00 AM	8:30 AM	04:00	08:30
5:00 AM	9:30 AM	05:00	09:30
6:00 AM	10:30 AM	06:00	10:30
7:00 AM	11:30 AM	07:00	11:30
8:00 AM	12:30 PM	08:00	12:30
9:00 AM	1:30 PM	09:00	13:30
10:00 AM	2:30 PM	10:00	14:30
11:00 AM	3:30 PM	11:00	15:30
12:00 PM	4:30 PM	12:00	16:30
1:00 PM	5:30 PM	13:00	17:30
2:00 PM	6:30 PM	14:00	18:30
3:00 PM	7:30 PM	15:00	19:30
4:00 PM	8:30 PM	16:00	20:30
5:00 PM	9:30 PM	17:00	21:30
6:00 PM	10:30 PM	18:00	22:30
7:00 PM	11:30 PM	19:00	23:30
8:00 PM	12:30 AM (next day)	20:00	00:30
9:00 PM	1:30 AM (next day)	21:00	01:30
10:00 PM	2:30 AM (next day)	22:00	02:30
11:00 PM	3:30 AM (next day)	23:00	03:30

12:00 AM

BST

4:30 AM

IST

00:00 04:30

1:00 AM

BST

5:30 AM

IST

01:00 05:30

2:00 AM

BST

6:30 AM

IST

02:00 06:30

3:00 AM

BST

7:30 AM

IST

03:00 07:30

4:00 AM

BST

8:30 AM

IST

04:00 08:30

5:00 AM

BST

9:30 AM

IST

05:00 09:30

6:00 AM

BST

10:30 AM

IST

06:00 10:30

7:00 AM

BST

11:30 AM

IST

07:00 11:30

8:00 AM

BST

12:30 PM

IST

08:00 12:30

9:00 AM

BST

1:30 PM

IST

09:00 13:30

10:00 AM

BST

2:30 PM

IST

10:00 14:30

11:00 AM

BST

3:30 PM

IST

11:00 15:30

12:00 PM

BST

4:30 PM

IST

12:00 16:30

1:00 PM

BST

5:30 PM

IST

13:00 17:30

2:00 PM

BST

6:30 PM

IST

14:00 18:30

3:00 PM

BST

7:30 PM

IST

15:00 19:30

4:00 PM

BST

8:30 PM

IST

16:00 20:30

5:00 PM

BST

9:30 PM

IST

17:00 21:30

6:00 PM

BST

10:30 PM

IST

18:00 22:30

7:00 PM

BST

11:30 PM

IST

19:00 23:30

8:00 PM

BST

12:30 AM

IST

(next day)

20:00 00:30

9:00 PM

BST

1:30 AM

IST

(next day)

21:00 01:30

10:00 PM

BST

2:30 AM

IST

(next day)

22:00 02:30

11:00 PM

BST

3:30 AM

IST

(next day)

23:00 03:30

Best Meeting Times between British Summer Time and India Standard Time

Optimal hours for calls between BST and IST

Business hours overlap available

9:00 AM BST → 1:30 PM IST

Business Hours

10:00 AM BST → 2:30 PM IST

Business Hours

11:00 AM BST → 3:30 PM IST

Business Hours

Based on standard business hours (9:00 AM - 6:00 PM) in each time zone

Time Zone Details

Technical information for both time zones

BST

British Summer Time

Source timezone

UTC Offset 1.0 hours

Abbreviation BST

Type Standard Time

Status Active

IST

India Standard Time

Target timezone

UTC Offset 5.5 hours

Abbreviation IST

Type Standard Time

Status Active

Convert BST to IST Time - London to Mumbai Converter

BST to IST Time Zone Difference

24-Hour BST to IST Conversion Chart

Best Meeting Times between British Summer Time and India Standard Time

Time Zone Details

British Summer Time

India Standard Time

Convert BST to IST Time - London to Mumbai Converter - FAQs

How many hours ahead is IST from BST?

What time is it in India when it's 9 AM in London?

What time is it in London when it's 9 AM in Mumbai?

Which cities use BST and IST time zones?

When does BST start and end in 2025?

What's the best time for business meetings between UK and India?

How does UK daylight saving time affect BST to IST conversion?

What's the easiest way to convert BST to IST quickly?

Convert BST to other time zones