How do you convert EST to GMT?

Use GMT = EST + 5 hours. For 10:00 EST that gives 15:00 GMT.

What does 10:00 EST actually mean?

It sits between 7 and 13 EST; the table on this page shows how those compare.

10:00 EST to GMT

15:00 GMT

10:00 Eastern Standard Time equals 15:00 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 → 15:00 GMT

Going the other way: 15:00 GMT to EST.

Convert a different time zone

EST =15:00 GMT

Open the full time zone converter for every other unit.

Nearby values

EST	GMT
07:00 EST	12:00 GMT
08:00 EST	13:00 GMT
09:00 EST	14:00 GMT
11:00 EST	16:00 GMT
12:00 EST	17:00 GMT
13:00 EST	18:00 GMT

Questions

What is 10:00 EST in GMT?: 10:00 EST is 15:00 GMT.
How do you convert EST to GMT?: Use GMT = EST + 5 hours. For 10:00 EST that gives 15:00 GMT.
What does 10:00 EST actually mean?: It sits between 7 and 13 EST; the table on this page shows how those compare.