Formula
Day 90 = entry date + 89 calendar days. Day 91 = entry date + 90 calendar days.
USCIS 90-Day Rule Calculator
Calculate day 90 and day 91 from a US entry date for immigration planning discussions.
Worked example
For entry on 2026-06-07, day 90 is 2026-09-04 and day 91 is 2026-09-05.
Professional note
Professional note: print the input values, formula, result and date together so the calculation can be reviewed later.
Regional and unit assumptions
Basis: transparent planning arithmetic using the visible inputs and assumptions on this page.
Assumptions and limitations
- Date arithmetic only. Immigration facts, visa category, intent evidence and legal advice can change the real-world answer.
Methodology & Accuracy
How this calculator is checked
CalculationTime pages are built around visible arithmetic: the formula, assumptions, worked example and practical limitations are shown so the result can be checked rather than simply trusted.
Formula used
Day 90 = entry date + 89 calendar days. Day 91 = entry date + 90 calendar days.
Standard or basis
Basis: transparent planning arithmetic using the visible inputs and assumptions on this page.
Where a calculator follows a named legal, trade or industry standard, that standard is cited visibly. Otherwise the page uses transparent general arithmetic and states its limits.Master's Tip
Professional note: print the input values, formula, result and date together so the calculation can be reviewed later.
Related calculators
Questions
What is the USCIS 90-Day Rule Calculator?
The USCIS 90-day calculator counts 90 calendar days from a US entry date and shows the day-90 and day-91 markers.
Can I rely on this as professional advice?
No. Use it as a transparent planning estimate, then verify the current rule, rate, contract or official source for the decision you are making.