How do you convert EST to GMT?

Use GMT = EST + 5 hours. For 15:00 EST that gives 20:00 GMT.

What does 15:00 EST actually mean?

It sits between 12 and 18 EST; the table on this page shows how those compare.

15:00 EST to GMT

20:00 GMT

15:00 Eastern Standard Time equals 20:00 Greenwich Mean Time.

These are standard-time offsets, which never change. What changes is which one a place observes: New York is on EST in winter but EDT (an hour later) during daylight saving, and the UK is on GMT in winter and BST in summer. If you mean "the time in New York right now", use the full converter — it reads live offsets.

How the conversion works

This one is a formula rather than a single multiplier:

GMT = EST + 5 hours → 20:00 GMT

Going the other way: 20:00 GMT to EST.

Convert a different time zone

EST =20:00 GMT

Open the full time zone converter for every other unit.

Nearby values

EST	GMT
12:00 EST	17:00 GMT
13:00 EST	18:00 GMT
14:00 EST	19:00 GMT
16:00 EST	21:00 GMT
17:00 EST	22:00 GMT
18:00 EST	23:00 GMT

Questions

What is 15:00 EST in GMT?: 15:00 EST is 20:00 GMT.
How do you convert EST to GMT?: Use GMT = EST + 5 hours. For 15:00 EST that gives 20:00 GMT.
What does 15:00 EST actually mean?: It sits between 12 and 18 EST; the table on this page shows how those compare.