Our free EST to MST converter instantly translates US Eastern Time into Mountain Time — the conversion between cities like New York, Boston, and Miami and Denver, Salt Lake City, and Albuquerque. The gap is a steady two hours, with one notable exception in Arizona (covered below).
Mountain Time runs two hours behind Eastern Time for most of the country: (Offsets follow the IANA Time Zone Database.)
Eastern Time is 2 hours ahead of Mountain Time for regions that observe daylight saving, constant all year. So 12:00 PM EST is 10:00 AM MST.
Most of Arizona does not observe daylight saving and stays on MST year-round. In summer that makes it 3 hours behind Eastern Daylight Time instead of the usual 2.
Noon EST is 10:00 AM MST. With only a two-hour gap, most business hours line up well across the two zones.
MST is 2 hours behind EST year-round. 100% free, no registration, and fully private — every conversion happens in your browser.
Uses the IANA database for America/New_York and America/Denver, so daylight saving is applied automatically — no manual offset math.
Convert EST to MST the moment you pick a time. No signup, no ads in your way, nothing to install.
Find the New York ↔ Denver overlap fast — both cities are in business hours roughly 11:00 AM–5:00 PM EST.
Every conversion runs locally in your browser using your device clock. Your dates and times never touch a server.
Reverse conversion
From Eastern Time
From Eastern Time
From Eastern Time
From Eastern Time
From Eastern Time
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