90 Day Probation Period Calculator
Apply the exact probation length, anniversary convention and confirmed extensions from an employment or appointment record. Inputs stay in your browser.
Probation length, creditable service, extensions and anniversary conventions are not universal. CalcSpan applies only the rule entered from the controlling employment record. Review note: Confirm the probation rule before relying on a date.
Context matters.
- U.S. private-sector employment has no single federal probation-period formula; the signed offer, policy, collective agreement and applicable law control.
- Federal appointment examples can use anniversary-style completion rules, but the exact appointment record and agency HR determination still control.
- A calculated date does not determine employment rights, termination authority, benefits or appeal rights.
Sources & scope
The calculation guide and this source trail show what the result means, where the rule came from and when it was last reviewed. This is source-and-calculation QA, not a claim of medical, legal, tax or other professional review; time-sensitive decisions still belong with the linked authority.
A visible path from input to answer.
Apply the exact probation length, anniversary convention and confirmed extensions from an employment or appointment record. The page keeps the calculation scope and its limits beside the result so the output can be checked, copied or revisited.
- Read the record. The calculator uses Employment / probation start date, Check date, Probation rule source, Period wording and Custom period stated in and 5 additional fields supplied in the form.
- Apply the scope. It applies the Employment-record arithmetic — exact offer, handbook, collective agreement, appointment record and applicable law control reference and the explicit date, unit and counting conventions shown in the result.
- Expose the checkpoints. Intermediate rows, warnings and timeline events stay visible; the emphasized row identifies the primary checkpoint when one exists.
Probation length, creditable service, extensions and anniversary conventions are not universal. CalcSpan applies only the rule entered from the controlling employment record. Review note: Confirm the probation rule before relying on a date.
- Rule sourceSigned offer, handbook or HR record
- Calculated last probation daySep 29, 2026
Calculation purpose: Apply the exact probation length, anniversary convention and confirmed extensions from an employment or appointment record. This is a high-sensitivity reference output; the linked authority or qualified professional controls the final decision.
Calendar inputs use plain year-month-day semantics. Leap days, month ends, date-pair order and unsupported dates are checked before the result is shown.
Rule set 2.0.0 · Last reviewed 2026-08-20 · Next review due 2027-02-20. The source panel below contains the linked evidence.
What to know before using the result.
Is there a universal probation-period length?
No. The signed offer, handbook, collective agreement, appointment record and applicable law can set different lengths and consequences. CalcSpan applies only the exact period entered.
Why can the last day be before the anniversary?
Some appointment and employment records treat the period as completed on the anniversary, making the preceding date the last day in probation. Other records say the employee remains in probation through the anniversary, so the controlling wording must be selected.
Can absence or leave extend probation?
It can under some policies or appointment rules, but not universally. Add only noncreditable or extension days that HR or the controlling record confirms for this employee.