Tehran×Washington
Three numbers. The ones that decide the meeting.
When the world meets at work.
Read the day in both zones.
If it's this in Tehran, it's that in Washington.
When it's 8:00 am in Tehran, it's 12:30 am in Washington — late night there, the same day.
When it's 10:00 am in Tehran, it's 2:30 am in Washington — late night there, the same day.
When it's 12:00 pm in Tehran, it's 4:30 am in Washington — late night there, the same day.
When it's 3:00 pm in Tehran, it's 7:30 am in Washington — morning there, the same day.
When it's 5:00 pm in Tehran, it's 9:30 am in Washington — late morning there, the same day.
When it's 9:00 pm in Tehran, it's 1:30 pm in Washington — midday there, the same day.
Crossing the border. Money, language, plugs.
Money changes hands at the border: Tehran uses the IRR (﷼) and Washington uses the USD ($). Language shifts too — Persian (Farsi) in Tehran, English in Washington. Cars drive on the right in both, so rentals feel familiar.
- Country
- Iran
- Capital
- Tehran
- Currency
- Iranian rial (IRR · ﷼)
- Language
- Persian (Farsi)
- Calling code
- +98
- Drives on
- Right
- Country
- United States
- Capital
- Washington, D.C.
- Currency
- United States dollar (USD · $)
- Language
- English
- Calling code
- +1
- Drives on
- Right
Quick answers. Before you book the call.
What's the time difference between Tehran and Washington?
Tehran is 7.5 hours behind Washington. Tehran runs on GMT+3:30 and Washington on GMT-4. The gap can shift by an hour when either side enters or leaves daylight saving — the live clocks above always reflect the current offset.
When it's 10 am in Tehran, what time is it in Washington?
10:00 am in Tehran is 2:30 am in Washington on the same day — late night there. The same shift applies to any hour; the quick-conversion cards and the 24-hour table above cover the full day.
When it's 3 pm in Tehran, what time is it in Washington?
3:00 pm in Tehran is 7:30 am in Washington on the same day — morning there. The same shift applies to any hour; the quick-conversion cards and the 24-hour table above cover the full day.
When's the best time to schedule a meeting?
Standard 09:00–17:00 workdays don't intersect. Most teams compromise with one side meeting early (before 09:00) or late (after 17:00).
Does daylight saving time change the difference?
Yes, if either city observes DST. When one side shifts and the other doesn't, the gap changes by one hour. The DST badges under each clock show whether each zone is currently shifted and when the next transition lands.
How far is Tehran from Washington?
About 10,176 km as the crow flies (great-circle distance). A non-stop commercial flight cruises that in roughly 12h 28m, not counting airport time, winds, or routing around restricted airspace.
Can I send this meeting time as a calendar invite?
Yes. Pick a time on the slider above, open the meeting card, customize the title and duration, then download the .ics file. It imports cleanly into Google Calendar, Outlook, and Apple Calendar with the correct timezone attached.
What currency do Tehran and Washington use?
Tehran uses the Iranian rial (IRR, ﷼); Washington uses the United States dollar (USD, $). Check the live rate before transferring money or paying with a card abroad — most banks add a 1–3 % FX margin on top of the mid-market rate.
How do I call Tehran from Washington?
Dial the international prefix used by your carrier (often 011), then +98, then the local number — drop any leading zero of the city or mobile code. For free calls, WhatsApp, Signal, and FaceTime work over Wi-Fi regardless of country code.
What language is spoken in Tehran and Washington?
Tehran primarily speaks Persian (Farsi); Washington speaks English. English is widely used in business contexts in major cities of both, but written contracts may need translation.
Do Tehran and Washington drive on the same side of the road?
Yes — both drive on the right. Rental cars feel identical between the two.