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Contract End Date Calculator

Enter your contract start date and duration to find the exact end date.

Contract ends on

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What this calculator does

This contract end date calculator finds when a fixed-term contract ends. Fixed-term contracts run for a defined length of time from a set start date, and this tool adds your contract duration — in days, weeks, or months — to the start date, treating the start date as day one, to give you the precise final day of the contract.

Worked example

A contract starts on March 1, 2026 for a duration of 6 months. Since the start date counts as day one, the contract runs through August 31, 2026, the day before the 6-month anniversary of March 1.

Common mistakes

  • Off-by-one end dates. A 12-month contract starting January 1 ends December 31, not January 1 of the following year — that date is the start of year two, not the last day of year one.
  • Mixing up weeks and months. "6 months" and "26 weeks" are close but not identical — months vary in length while weeks are always 7 days.
  • Missing notice-to-terminate windows. Some fixed-term contracts require a writtennotice period before the end date if either party wants to avoid automatic renewal — check separately from this calculation.

Frequently asked questions

Is the contract end date inclusive of the start date?+

Yes. This calculator treats the start date as day one, so a 12-month contract starting January 1 ends on December 31 of the same year — the day before the anniversary of the start date.

What if my contract is measured in weeks or days instead of months?+

Select the matching unit. A contract of "26 weeks" and one of "6 months" will usually give slightly different end dates, since 6 months is not always exactly 182 days.

Does this calculator account for contract extensions or renewals?+

No — it calculates a single fixed term from the original start date and duration. If your contract is extended, recalculate using the extension's new start date and length.

What happens after the contract end date?+

That depends on your contract terms: it may auto-renew, convert to a rolling arrangement, or simply terminate. Check your contract's renewal clause well before the end date.

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