Practical guide
Notice Period Calculator: 1 Week, 2 Weeks, 1 Month, 4 Weeks (UK)
Calculate notice days remaining after time served and approved leave, with common weekly, monthly, and UK statutory examples.
By StackCalcs · Updated · Sources checked
A notice period calculator works out how many days of contractual notice remain, given your total notice period, days already served, and any approved leave offset. It covers any notice length in days — including 1 week (7 days), 2 weeks (14 days), 1 month (about 30 days), 4 weeks (28 days), 6 weeks (42 days), and 3 months (about 90 days) — so it works for both UK-style weekly notice and month-based contracts elsewhere.
This tool calculates days, not a departure date
The Notice Period Calculator calculates contractual notice days minus days already served and an approved leave offset, with a floor of zero. A 90-day clause less 37 served days and 6 approved offset days produces 47 remaining days. Use the number only after the employer has confirmed that the leave counts as an offset.
1 month vs 4 weeks notice, and UK statutory minimums
“1 month’s notice” and “4 weeks’ notice” are not the same: 1 month is roughly 30 or 31 days depending on the calendar month, while 4 weeks is fixed at 28 days — a difference of 2–3 days that matters for a precise last working date. In the UK, the Employment Rights Act 1996 sets a statutory minimum notice of 1 week once an employee has one month’s service, rising to 1 week per full year of service up to a maximum of 12 weeks; an employment contract may specify longer notice (commonly 1 month or 3 months for senior roles) but cannot legally specify less than the statutory minimum. Acas guidance is the primary UK reference; notice rules elsewhere can differ.
The calculator does not convert days into a calendar last-working date. Weekends, public holidays, start-date rules, garden leave, notice buyout, resignation acceptance, and local employment law can change the real outcome. Acas guidance is useful primary reading for its UK context; employment terms elsewhere can differ.
Keep the contract clause, resignation acknowledgement, and written leave approval together. If the calculation reaches zero because inputs exceed the contractual period, that is merely the tool’s floor, not confirmation that the employer has waived a notice obligation.
FAQ
Can I use this to calculate notice buyout money?
No. It has no salary or buyout formula.
Does approved leave always reduce notice?
No. Enter it only where the employer has approved it as an offset.