The UK Notice Period Calculator helps employees in the United Kingdom work out their final working day after handing in a resignation. It covers the standard notice periods written into most UK employment contracts — one and two weeks, and one, two, or three months — and includes guidance for specific situations like NHS employment, teaching contracts, probation, and immediate resignation.
Who built this
This site is run as an independent personal project. It isn’t affiliated with any government body, employer, recruitment agency, or law firm. We’re not employment lawyers, and nothing on this site is legal advice — if you need formal advice about your contract or a dispute, speak to a solicitor or contact ACAS.
How the calculator works
All calculations run in your browser — nothing about your resignation date or notice period is sent to our servers, because there are no servers. The page is a static HTML file with a small amount of JavaScript that adds the right number of days or calendar months to the date you choose.
Months are added as calendar months: 15 March plus one month is 15 April, and 31 January plus one month rolls back to 28 February (or 29 February in a leap year) because there is no 31st. Weeks are added as calendar days, including weekends. There’s an optional toggle to roll the result back to the previous Friday if it lands on a Saturday or Sunday — that’s a practical convention rather than a legal rule, but it matches how most employers treat the date.
What we’re trying to do
Most people only resign a handful of times in their working life, and when they do they usually want a quick, accurate answer to one question: “when’s my last day?” The goal of this site is to give that answer in under thirty seconds, surrounded by enough context that you understand what the date means and what to do next.
Mistakes and corrections
If you spot a mistake in the calculations or in the guidance, get in touch via the contact page. Corrections are made promptly and credited if you’d like to be.