Notice Period Calculator

How the Notice Period Calculator works

Notice periods are written in plain language, such as one month or four weeks, but turning that into a date is surprisingly easy to get wrong. Does the day you hand in your letter count? What happens to one month's notice given on 31 January? Getting the date a day out can mean an extra day of pay, a missed start date at a new job or a rental deposit dispute.

How the notice period calculator counts

The calculator supports the two counting conventions you will meet in contracts and policies.

• Notice starts the day after is the usual reading. Notice given on Monday 5 October for one week runs from Tuesday 6 October and ends on Monday 12 October, seven full days later.
• Notice day counts as day one treats the day you give notice as the first day. The same week then ends on Sunday 11 October.

Weeks are always seven calendar days. Months move to the same date in a later month: one month from 5 October ends on 5 November, or 4 November when the notice day counts. When the later month is shorter, the date is pulled back to that month's last day, so one month from 31 January ends on 28 February, or 29 February in a leap year.

Reading the result

• Last day of notice is the final day you are bound by the notice, written in full with the weekday.
• ISO date gives the same date as YYYY-MM-DD for forms and spreadsheets.
• Notice runs from shows the first day being counted.
• Calendar days counts every day of the notice, weekends included.
• Weekdays counts Monday to Friday only, a rough guide to working days before any public holidays are taken off.

If notice ends on a Saturday or Sunday, a note gives the last weekday before it. Many people agree with their employer to finish on that Friday, but whether that is allowed depends on your agreement.

Worked examples

One month's notice given on Thursday 15 October, counting from the day after, ends on Sunday 15 November. The note suggests Friday 13 November as the last working day before it, and the notice covers 31 calendar days and 21 weekdays.

Four weeks' notice given on Friday 2 October ends on Friday 30 October.

Thirty days' notice to a landlord given on 1 March ends on 31 March, which is often what a tenancy requires so that the move-out lines up with the end of a rent period.

What this calculator does not decide

The calculator counts dates; it does not tell you how much notice is required. That depends on your employment contract, tenancy agreement, collective agreement or service terms, and on the law where you live. Contracts sometimes say notice must be given in writing, received by a certain day, or end on the last day of a month or a pay period. Read those terms carefully, apply them first, and then use the calculator to find the date.

When notice is sent by post or email, the date it is treated as given may be the date it is received rather than the date it was sent. If the timing is tight, send it a few days early and keep proof of delivery.

Tips for resigning or giving notice

• Check your contract for the length of notice and how it must be given before you write the letter.
• Put the date of your letter and your intended last day in writing, using the date this calculator gives.
• Ask whether unused holiday will be paid out or taken during the notice period, as that changes your last working day.
• If a new employer needs you sooner, ask your current one to agree an earlier date in writing.
• Keep a copy of the letter and any acknowledgement.

Notice for leases and services

The same counting applies to rental agreements, phone contracts, gym memberships and supplier agreements. Tenancies often require notice to end on the last day of a rental period, so check that rule and use the rental lease calculator to see payment dates. For fixed-term contracts with a renewal deadline, the contract end date calculator works back from the end of the term.

How many days each notice period lasts

The formula adds the notice length to the date notice is given; months are calendar months, and a date that does not exist in the target month falls back to that month's last day. For example, one month from Monday 5 October 2026 ends on Thursday 5 November 2026, which is 31 calendar days and 23 weekdays. Each example below starts from the same Monday.

Last day of notice given on Monday 5 October 2026

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