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Immigration, Visa & Travel DocumentsGenerated accuracy model review: 2026-05-06
ESTA Expiration Calculator accuracy and testing
This page documents how Calwarden builds trust for this calculator: source notes, regression-style default tests, limitations, assumptions, unit handling, rounding, and visible change history.
Formula source
- Authorization end date = approval date plus entered validity years. Estimated expiration date = earlier of authorization end date and passport expiration date. Days available at entry = estimated expiration date minus planned entry date.
Test cases
Default input regression check
Generated from the checked-in default inputs and calculate function.
Inputs
- Authorization Approval Date: 2026-05-01
- Authorization Validity: 2 years
- Passport Expiration Date: 2028-04-15
- Planned Entry Date: 2026-11-15
- Maximum Stay to Model: 90 days
- Renewal Buffer: 30 days
Expected outputs
- ESTA Planning Status: Valid on entered entry date; start renewal planning by 2028-03-16
- Estimated Expiration Date: 2028-04-15
- Days Available at Entry: 517 days
- Latest Modeled Exit Date: 2027-02-13
Known limitations
- This calculator does not check live ESTA records, eligibility answers, passport changes, previous denials, admissibility, overstay history, airline requirements, or official CBP decisions.
Assumptions
- The authorization validity years and maximum stay days are user-entered planning values.
- The expiration date is modeled as the earlier of authorization validity end and passport expiration.
- This calculator runs in your browser from the values you enter. It is a planning estimate only, not legal, tax, immigration, or official government advice.
Unit handling
- Authorization Approval Date accepts calendar dates.
- Authorization Validity accepts values in years.
- Passport Expiration Date accepts calendar dates.
- Planned Entry Date accepts calendar dates.
- Maximum Stay to Model accepts values in days.
- Renewal Buffer accepts values in days.
- Days Available at Entry is displayed in days.
Rounding rules
- Number displays use up to 2 decimal places in the calculator UI.
- Input precision follows configured step values where provided.
Version history
1.0.0 - 2026-05-06
Generated accuracy and testing page from the current esta-expiration-calculator calculator definition.
Change log
2026-05-06
Published default regression test documentation and metadata fallbacks for ESTA Expiration Calculator.
Calculator transparency
Accuracy pages are generated from checked-in calculator definitions and can be upgraded with curated review metadata over time.