Notice Period Calculator Guide: How to Work Out Your Last Day and Start Date

Overview

Your notice period is the amount of time you must usually give your current employer before your employment ends. The exact calculation depends on the wording of your contract, the date your resignation is received, your normal working pattern, and the employment rules that apply where you work.

A calculator provides an estimate, not a replacement for your employment contract or professional advice. Pay close attention to terms such as calendar days, working days, weeks, months, notice given, and notice received. Two contracts can use the same number of days but produce different results because they define the start date differently.

It is also useful to distinguish between three dates:

• Resignation date: the date you submit your resignation.
• Last working day: the final day you are expected to work, unless your employer agrees otherwise.
• Employment end date: the date your employment formally ends. This may be the same as your last working day, but do not assume it is.

If you are planning a move into remote work, an internship, or an entry-level role, confirming these dates early can help you give a realistic answer when an employer asks, “When can you start?” For broader offer comparisons, see our salary and take-home pay guide.

How to estimate your notice period

Use the following process for a repeatable estimate.

1. Find the notice clause. Check your employment contract, offer letter, staff handbook, or other written terms. Look for separate rules covering probation, resignation, dismissal, fixed-term work, or changes in role.
2. Identify the unit of time. Determine whether the notice is stated in calendar days, working days, weeks, or months. “Four weeks” should not automatically be treated as “one calendar month.”
3. Confirm when notice starts. Some arrangements count from the day notice is received; others begin on the following day or on a specified date. If the wording is unclear, ask your manager or HR team to confirm in writing.
4. Enter the notice date and length. Use the date your resignation is actually delivered or acknowledged, rather than the date you drafted it.
5. Apply the counting rule. Count each calendar day or working day as required. For a week-based notice, check how the contract treats the matching weekday and any cut-off times for submitting notice.
6. Check the final date manually. Compare the calculator result with the contract wording. If the result falls on a weekend, public holiday, or scheduled non-working day, confirm whether that changes your final working day or only your practical handover arrangements.
7. Plan the new start date. The safest general assumption is that you start the new job after your current employment has ended, unless both employers agree to another arrangement.

A simple worksheet can look like this:

• Date resignation is received: __________
• Notice length: __________
• Counting method: calendar days / working days / weeks / months
• Expected last working day: __________
• Expected employment end date: __________
• Earliest proposed new start date: __________
• Dates requiring confirmation: __________

Inputs and assumptions

A reliable notice period calculator needs more than a single number. Gather these inputs before calculating:

Notice length and counting method

Record the precise wording. A notice of 10 calendar days includes days that are not normally worked, subject to the applicable contract and employment rules. A notice of 10 working days may exclude weekends and other non-working days. A notice stated in months can require particular care because calendar months have different lengths.

Date notice is received

Keep evidence of when you submitted your resignation and when it was received. An email timestamp, HR acknowledgement, or signed letter may help resolve confusion. If you submit notice outside normal working hours, the contract or workplace procedure may determine whether it is treated as received that day or the next working day.

Working pattern

Part-time employees, shift workers, and people working compressed schedules should check how their contract defines a working day. Your personal roster may affect the last shift you work, while the notice calculation may still follow a separate contractual rule.

Holiday and absence

Unused holiday, approved leave, sickness absence, and scheduled closure periods can affect your handover plan. They do not necessarily shorten the contractual notice period. Ask how outstanding holiday will be taken, paid, or carried into the final pay calculation under the rules that apply to you.

Changes agreed with the employer

Your employer may agree to a shorter notice period, a later release date, or another arrangement. Do not rely on a verbal conversation alone; request written confirmation of any change, including the final employment date and any impact on pay or benefits.

For related calculations, you may also want to review a take-home pay calculator guide and a job offer comparison guide.

Worked examples

Example 1: Calendar-day notice

Assume a contract requires 14 calendar days and your resignation is confirmed as received on 3 April. Under the assumption that counting begins on the following day, count 4 April as day one and 17 April as day 14. The estimated final date is therefore 17 April. If the contract counts the receipt date as day one, the result would be one day earlier. This difference is why the counting rule must be confirmed.

Example 2: Week-based notice

Assume the contract requires two weeks and notice is received on a Tuesday. If the contract treats the notice period as two complete weeks ending on the corresponding weekday, the estimated end point may fall on the Tuesday two weeks later. Your last day actually worked could be different if Tuesday is not part of your normal schedule or if the contract specifies another convention.

Example 3: Holiday during notice

Assume you have a four-week notice period and two days of approved holiday during that period. The holiday may remain inside the notice period rather than extending it, but the answer depends on the contract, workplace policy, and applicable rules. Ask for confirmation of both your employment end date and the treatment of unused holiday.

Example 4: Planning a new start date

If your estimated last working day is 30 June, propose 1 July as the earliest start date only after confirming that your current employment ends on 30 June and that no additional restriction applies. Build in a small buffer if you need time for travel, relocation, onboarding paperwork, or a final payroll check. An employer may prefer a later start date, so present the estimate as “available from” rather than as an unconditional promise.

When to recalculate

Recalculate your notice period whenever an input changes. This includes a revised resignation date, a delayed HR acknowledgement, a change to your work schedule, a newly approved holiday period, or a written agreement with your employer. Recheck it if you move from probation into a permanent role, change contracts, or receive a counteroffer with different terms.

Before sending your resignation, complete this action list:

1. Read the current contract rather than relying on an older offer letter.
2. Write down the notice length, unit, and start rule.
3. Calculate the estimated last working day and employment end date separately.
4. Ask HR or your manager to confirm any ambiguous wording.
5. Check holiday, benefits, bonus, commission, equipment return, and payroll arrangements.
6. Tell the prospective employer your confirmed or estimated availability honestly.
7. Save written confirmation of the final date and any agreed variation.

Once your dates are settled, organize applications and follow-ups with a job application tracker. If you are still comparing opportunities, research the employer using our company research worksheet. Revisit this calculation whenever the contract, dates, or agreed arrangements change, and use local official guidance or qualified advice when the result could affect your legal rights or pay.