How long will mail take? (ZIP to ZIP)
Enter two US ZIP codes, pick a mail class, and set the drop-off time to see a typical arrival window. Business days skip weekends and US federal holidays.
Estimated results
How it works
- ZIP inputs — accepts 5‑digit or ZIP+4 (we use the first 5 digits).
- Service class — uses typical USPS business‑day ranges per class.
- Start date — if you drop after your cutoff or on a non‑business day, we start the next business day.
- Business days — weekends and US federal holidays are skipped; optionally include Saturdays.
- Heuristics — adds modest buffers for national routes and AK/HI/PR.
This tool is informational and not a service guarantee.
Typical class ranges (business days)
- First‑Class Mail (letters/postcards): 1–5
- USPS Ground Advantage: 2–5
- Priority Mail: 1–3
- Priority Mail Express: 1–2 (often guaranteed)
- Media Mail: 2–8
Actual times vary by route, weather, volume, and acceptance scan timing.
Examples
Local
07004 → 07012 · First‑Class
~1–3 business days
Regional
60601 → 46204 · Priority
~1–3 business days
National / Offshore
94103 → 96720 · Ground
~3–6 business days
Tap any label in the calculator to open its picker quickly.
FAQ
Is this an official USPS calculator?
No. Daydelta is independent and provides estimates based on typical service standards.
Do you count Saturdays?
You can toggle Saturdays on/off. Sundays and US federal holidays are always excluded.
What about Priority Mail Express guarantees?
USPS may offer a limited money‑back guarantee for many destinations. Other classes are not guaranteed.
Can I enter ZIP+4?
Yes. We’ll sanitize to digits and use the first 5.
Why can long‑distance routes take longer?
National routes and AK/HI/PR often have longer transit variability, so we add a small buffer to the range.
Methodology & limitations
- Service standards — fixed business‑day ranges per class, then adjusted by zone type (local/regional/national).
- Offshore heuristic — adds a day on AK/HI/PR (except Express).
- Start logic — after cutoff or non‑business day → next business day.
- Holidays — US federal holidays (observed) are skipped.
- Not guarantees — weather, volume, operational issues can change outcomes.
We welcome feedback and real‑world timing reports to improve the estimator.
About this tool
Daydelta is not affiliated with USPS. Use official carriers for guaranteed delivery commitments.