How to Calculate Notice Periods and End Dates

If you've just handed in your notice or received notice that you're leaving, you need to calculate your notice period and find your exact end date. A one-month notice period doesn't mean 30 calendar days—it means one calendar month from the date you serve notice, which could be 31 or 28 days depending on which months you're spanning. Your last working day depends on when notice starts, what day of the week it starts on, and whether it includes bank holidays. Our date calculator helps you find your exact leaving date in seconds. Read on to learn how notice periods work in the UK and how to calculate them by hand.

Understanding Notice Periods in the UK

A notice period is the amount of time between when you (the employee) hand in your resignation and when you actually leave your job. It's also used when an employer terminates your employment—they must give you notice, not just walk you out the door.

According to UK employment law, the minimum statutory notice period is one week. However, your employment contract may require longer notice—often one month, three months, or more depending on seniority and sector. Charities and public sector roles often require three months' notice. Senior management roles might require six months or more.

The key thing about notice periods: they're usually measured in calendar days, not working days. If you hand in your notice on 1 May with one month's notice, your last day is 1 June—whether or not the 1st falls on a Saturday. But here's where it gets tricky: most employers don't ask you to work bank holidays during your notice period, which means your actual working days are fewer than the calendar days.

Example: You hand in one month's notice on 15 April. One calendar month later is 15 May. But if that includes a bank holiday (May Day, the Early May Bank Holiday), you'll only actually work 20 days instead of 21. The notice period still runs for 30 calendar days, but you won't be in the office for all of them.

How to Calculate Your Notice Period End Date

Here's the step-by-step process to find your last working day:

Step 1: Find out when your notice starts. Usually it's the day after you hand in your resignation letter. If you resign on Friday 19 April at 5pm, notice typically starts on Monday 22 April (or the next working day). Some employers backdate it to the date you handed the letter. Check your employment contract or ask HR.

Step 2: Count forward in calendar days. Add the required number of days to your start date. Our add-or-subtract-days calculator makes this instant—you just enter the start date and the number of days. One month = 30 or 31 days depending on the month. One week = 7 days. Three months = 91 days approximately (usually 90–92 depending on which months).

Step 3: Identify weekends and bank holidays. Your notice period includes weekends and bank holidays—the notice clock doesn't stop. But if you're not scheduled to work those days, they don't count toward your working hours. Bank holidays in 2026 in England are: New Year's Day (1 Jan), Good Friday (14 Apr), Easter Monday (17 Apr), Early May Bank Holiday (4 May), Spring Bank Holiday (25 May), Summer Bank Holiday (31 Aug), Christmas Day (25 Dec), Boxing Day (26 Dec). Some countries have different bank holidays; check the gov.uk page for Scotland, Wales, or Northern Ireland.

Step 4: Count working days. For planning purposes—like how many days you'll actually be in the office—calculate the working days between your start date and end date. This strips out weekends and (usually) bank holidays.

Example: You hand in notice on Monday 19 May with three months' notice.

Notice starts: Tuesday 20 May
Add 91 days: Friday 20 August (approximately—let's check: May has 31 days, so 11 days left in May; June has 30 days; July has 31 days; that's 72 days, leaving 19 days in August → 20 August ✓)
But there's a bank holiday on 25 May (Spring Bank Holiday). Your actual working days are fewer, but the notice period still runs for the full 91 calendar days.
Your last working day is Friday 20 August (unless that's a weekend—in this case it's a Friday, so you're good).

Common Notice Period Lengths and Their Calculations

One week's notice

This is the statutory minimum in the UK (after you've been employed for at least one month). Count forward 7 calendar days from when notice starts.

Notice handed in: Monday 5 May
Notice starts: Tuesday 6 May
Last day: Monday 12 May (7 days later)
Working days: 5 (Tuesday–Friday of the first week, plus Monday of the second week)

One month's notice

The most common notice period in office and retail jobs. Count forward 30–31 days depending on which months.

Notice handed in: 1 May
Notice starts: 2 May
Last day: 1 June (30 days later, but May has 31 days, so it's actually 30 days forward = 1 June)
Working days: roughly 21–22 (depends on weekends and any bank holidays in the period)

Three months' notice

Standard for senior roles, management, and specialist positions. Count forward 91 calendar days (13 weeks × 7 = 91).

Notice handed in: 1 February
Notice starts: 2 February
Last day: 3 May (91 days later: 26 days left in February [28–2], 31 in March, 30 in April, + 4 in May = 91)
Working days: roughly 62–65 (most Mondays–Fridays in that period, minus 4 bank holidays in the typical case)

Use our weeks-between-dates calculator to quickly see how many weeks a notice period spans, which helps you visualize the time remaining.

Why Working Days Matter

Here's the catch that surprises people: your notice period is a calendar duration, but your working hours are based on working days only.

Let's say you have one month's notice and your last working day falls right before a long weekend:

Notice handed in: 1 May
Last calendar day: 1 June
If 1 June is a Sunday, your last working day is actually Friday 30 May.
If a bank holiday falls in between, that day doesn't count toward your working hours (but the notice period still runs).

Garden leave: If your employer puts you on garden leave during your notice period, you're still employed (and still paid) but you don't work in the office. The notice period still runs. This is sometimes used for senior roles or sensitive positions (like IT staff with access to systems) to prevent you from sharing confidential information with competitors. Your notice end date doesn't change; you're just not there.

Plan your last working days with our key-dates calendar so you know what you need to hand over and when.

Frequently Asked Questions

Q: Does my notice period include weekends? A: Yes. Your notice period is measured in calendar days, so the clock keeps ticking on weekends. If your last day falls on a weekend, it still counts as the end of your notice period—but your last working day would be the Friday before. Check your employment contract to be sure.

Q: What if I hand in notice but my employer asks me to leave immediately? A: They must either pay you for your notice period (notice in lieu) or allow you to work it. They can't just terminate you without notice or compensation unless you've breached your contract in a serious way (gross misconduct). Anything less requires notice or pay instead. ACAS has detailed guidance on your rights.

Q: Can I negotiate a shorter notice period? A: Yes. Your notice period is usually in your employment contract, but you can ask your manager or HR if they'd agree to a shorter one. Many employers prefer this because it frees you up sooner and avoids the awkward "already left mentally" situation. But they have no obligation to agree.

Q: Do I get paid during my notice period? A: Yes. You're still an employee, so you get your normal salary, benefits, and (usually) holiday pay. If you take holiday during your notice period, it usually comes out of your remaining holiday allowance. Some employers allow you to use remaining holiday on top of your notice period; others require you to use it during.

Q: What if I'm a manager handing in notice—should I give longer notice? A: Not necessarily, but it's professional to consider your team's handover needs. Your employment contract specifies the minimum, but giving longer notice helps your employer find a replacement and you can properly hand over responsibilities. Three months is common for senior roles.

Q: If a bank holiday falls during my notice period, do I still count it as a working day? A: No. Bank holidays are non-working days, so they don't count toward your actual working hours. But your notice period still runs on bank holidays—the calendar doesn't pause. If you have 20 working days of notice left and a bank holiday falls in there, you'll actually work only 19 of those 20 days, but the notice period ends on the same date.

Q: Can my employer make me work through my notice period if I'm offered a job elsewhere? A: Your employer can require you to work your full notice period if it's in your contract. If they agree to release you early, that's generous. If they don't and you leave anyway, they could potentially take legal action (though this is rare in practice). Discuss with HR if you need to leave sooner.

Q: How do I calculate my last day if my notice period spans a long weekend or multiple bank holidays? A: Use our days-between-dates calculator to count the working days, and our date-addition tool to find the calendar end date. Enter your notice start date and the number of calendar days (30, 91, etc.), and the tool tells you the end date. Then count back to find the actual last working day.

Planning Your Notice Period and Last Day

Your notice period is a fixed duration, but how you spend it makes a difference. Plan your key dates and handover tasks so you don't scramble in your final weeks.

Key milestones to mark:

Week 1: Announce your departure to your team (if not already done). List what needs to be handed over.
Week 2–3: Start documentation, train your replacement, transfer passwords and access.
Final week: Ensure all tasks are complete, do final sign-off with your manager, pack your personal items.

For precise calculations, use our date tools:

Add or subtract days from a date — find your exact last day by entering your notice start date and the number of calendar days
Calculate days between two dates — count the working days you'll actually be in the office
Calculate weeks between dates — see how many weeks your notice spans

Your notice period is a finite clock. Make it count, and make sure you know exactly when it ends.