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Contract Expiry Calculator

Find the exact date a contract expires from its start date and term length in days, weeks, months, or years.

Unit

Contract expiry date

Example

January 1, 2026

2026-01-01 · UTC

Based on

Start date
2025-01-01
Term length
12 months

A contract starting 2025-01-01 for 12 months (365 calendar days from start to end) expires on January 1, 2026.

More detail

Duration
12 months (365 calendar days from start to end)

Pair with the Contract Renewal Calculator if your contract requires advance notice before it expires or auto-renews.

Next step: Contract End Date Calculator

When to use this calculator

Use this calculator whenever a contract, license, subscription, or lease uses "expiry date" language for its term end, and you know the start date and term length.

  • License or subscription expiry

    Find the exact expiry date of a software license or subscription from its activation date and term.

  • Lease expiry

    Confirm when a fixed-term lease expires from its start date and length.

  • Warranty expiry

    Check the exact date a product or service warranty term ends from its activation date.

  • Renewal deadline planning

    Pair with the Contract Renewal Calculator to find the deadline to act before this expiry date.

Inputs

  • Start date

    The date the term begins—activation date, contract signing date, or lease start date.

  • Duration and unit

    The term length, in days, weeks, months, or years, as stated in the agreement.

How the calculation works

Enter the contract start date and term length. Days and weeks add calendar days; months and years use calendar-month math on the UTC calendar (with end-of-month clamping when needed, for example January 31 plus one month becomes February 28 or 29)—the same engine behind the Contract End Date Calculator.

The expiry date is the term length added forward from the start date. This calculator does not model auto-renewal, notice periods, or business-day adjustments—use the Contract Renewal Calculator if your agreement requires advance notice before it expires or auto-renews.

Worked example

Start date: 1 March 2025. Duration: 18 months.

Expiry date: 1 September 2026 (18 calendar months added, no clamping needed since the 1st exists in every month).

For a shorter 6-month term from the same start date, the expiry date would be 1 September 2025 instead.

Edge cases

  • Month-end start dates

    A term starting 31 October with a three-month duration expires 31 January (January has 31 days); the same three-month term from 31 August expires 30 November (November has only 30 days—end-of-month clamping applies).

  • Very short or very long terms

    Day- and week-based terms suit short trials or promotional periods; year-based terms suit standard licenses and leases. Both use the same underlying date math, just a different unit.

  • Expiry date on a weekend or holiday

    The computed expiry date is not adjusted off weekends or holidays. If your agreement extends a weekend expiry to the next business day, apply that adjustment manually.

Related Contracts & Legal Calculators

The Contract End Date Guide is the primary reference for how contract end dates are calculated, how they differ from notice periods, and which calculator to use for each step.

The SLA Deadline Guide covers response and resolution SLA deadlines, business-day vs hour-based clocks, and holiday handling for helpdesk and vendor agreements.

The Contract End Date Calculator projects a contract end date from a start date and term length, with 30-, 60-, and 90-day renewal reminder dates.

The Contract Expiry Calculator is the same date math, framed for the 'expiry date' language some contracts, licenses, and subscriptions use instead of 'end date.'

The Contract Duration Calculator works the other way: given a contract's start and end dates, it finds the exact term length in years, months, and days.

The Contract Renewal Calculator works backward from a known end date and a renewal or cancellation notice period, to find the deadline to act before auto-renewal.

The License Renewal Calculator and Certification Renewal Calculator apply the same issue-date-plus-validity-period math to licenses, permits, and professional credentials rather than contracts.

The SLA Deadline Calculator adds hours, calendar days, or business days to a start date and time to produce a response or resolution deadline in UTC.

For notice periods tied to an employment relationship rather than a contract or vendor agreement, see the Notice Period Calculator in HR & Employment.

For business-day counting that contract and SLA deadlines depend on, see the Business Days Calculator and Add Business Days To Date Calculator in Date & Business Days.

FAQ

How do I find when a contract expires?
Enter the contract start date, the term length, and the unit (days, weeks, months, or years). The calculator adds that term forward from the start date and shows the exact expiry date.
How is this different from the Contract End Date Calculator?
Same underlying date math, presented for the "expiry date" framing some contracts, licenses, and subscriptions use instead of "end date." The Contract End Date Calculator also shows 30/60/90-day renewal reminder dates.
Does this account for auto-renewal?
No. This calculator only computes the expiry date from a fixed term. If your contract auto-renews unless you give notice, use the Contract Renewal Calculator to find that notice deadline.
Can I use this for a license or certification instead of a contract?
The date math is the same, but the License Renewal Calculator and Certification Renewal Calculator are framed specifically for issue dates and validity periods, and also show 30/60/90-day renewal reminders.

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