International calling guide
The US spans six time zones — EST (UTC−5) to HST (UTC−10) — so always confirm your contact's state before dialling. Most offices run Monday–Friday, 9 AM–5 PM local time. Safest cross-country window: 12–3 PM Eastern, when all zones are open.
United States
+1 · UTC
Local Time Now
--:--:-- AM
See the live time gap between a global reference city and United States at a glance no calculator needed.
Reference
New Delhi Time Now
--:--:-- AM
Destination
Washington, D.C., United States Time Now
--:--:-- AM
Six time zones and wildly different work cultures make US calls easy to miss. These four factors cut through the complexity.
Pro tip: Schedule calls for 10–11 AM Eastern to hit a window where East Coast callers are settled in and West Coast callers are just arriving. Avoid Mondays before 10 AM and Fridays after 3 PM in any time zone.
The US spans EST (UTC−5), CST (UTC−6), MST (UTC−7), PST (UTC−8), AKST (UTC−9), and HST (UTC−10). Always confirm your contact's state — or even city — before dialling.
Most US states observe DST, shifting clocks forward in March and back in November. Arizona (except Navajo Nation) and Hawaii do not — factor this in when scheduling calls.
Finance and law firms on the East Coast start as early as 7 AM. Tech companies on the West Coast often don't hit stride until 10 AM. Match your timing to the industry, not just the clock.
Beyond federal holidays like Thanksgiving and Labor Day, many states observe additional holidays. Check both federal and state calendars for your contact's location.
The time differences range from 8 hours ahead of UTC to 5 hours behind UTC, showcasing the diverse time zones across the globe.
UTC
0 hours
UTC
0 hours
UTC
0 hours
UTC
0 hours
The right window doubles your answer rate. The wrong one sends you straight to voicemail.
Avoid
Call without checking the contact's time zone
Best Window
Tue–Thu, 10–11 AM Eastern
Avoid
Ring on Thanksgiving, Labor Day or July 4
Best Window
Mid-week, confirmed work day
Avoid
Cold call Monday morning before 10 AM
Best Window
Scheduled, pre-announced call
Avoid
Call after 5 PM local (strict finish times)
Best Window
13:30–15:30 local after lunch
Smart timing isn't just courtesy it directly drives better outcomes for every call you make.
Calling mid-morning (10 AM–noon local) on Tue–Wed doubles pickup vs. Monday cold dials in the US.
2×
more pickups
Confirming your contact's US time zone (4 main zones) shows scheduling precision.
+38%
connect rate
Pre-confirmed mid-morning calls see 4× more engagement than unscheduled attempts in the US.
4×
engagement
Calling during the Christmas–New Year period or US federal holidays sends 90% of calls to voicemail.
−90%
voicemail drops
Use these resources to plan every international call with confidence.
Set reminders and plan calls in advance so you never miss the optimal window.
Leverage automated analytics to identify the best call timing for every contact.
Instantly translate your local time to the recipient's timezone before dialling.
Professional outreach with automated scheduling features built into your CRM.
Four simple steps for every international call to United States dial it right, every time.
Press "+" on mobile or "00" from most landlines. This opens an international line.
United States's international code. Every call to United States must start with +1.
US numbers are 10 digits: 3-digit area code + 7-digit number. There is no leading zero to drop — dial all 10 digits after the +1 country code.
Dial all 10 digits. A typical US number: +1 212 555 0100.
Jump to any country's best-time-to-call guide. Click any flag to open the full page.
All countries AZ
Pair perfect timing with carrier-grade routing. TKOS provisions inbound DIDs and outbound termination across 100+ countries on tier-1 interconnects.
Everything you need to know about timing, time zones, and dialing United States (+1). Still have a question? Our wholesale team is one click away.
Tuesday–Thursday, 10:00–11:00 AM Eastern is the safest cross-country window — East Coast is settled in and West Coast is just arriving. The US spans six time zones, so always confirm your contact's state before dialling.