Plain-English calculators for holiday entitlement, working days, holiday pay, rolled-up holiday pay, part-time staff and leavers. No email gate, no hidden result, and the working is shown so you can check the calculation.
More resources: Blog · Help & guides · Compare tools · All resources
Use this page when you need a UK annual leave calculator, holiday pay calculator or working days calculator. Each tool gives a practical answer for employers and explains the assumptions, formulas and limits behind the result.
Start here if you need to work out statutory holiday entitlement for a full-time, part-time, days-based or hours-based worker. The calculator shows the 5.6 weeks rule, applies the statutory cap where relevant, and gives a shareable result.
These are built around real employer tasks: setting annual allowances, checking part-time entitlement, calculating holiday pay, working out rolled-up holiday pay, handling leavers and counting working days.
Work out the payroll value of closing over Christmas, the days it takes from each person's allowance, and the leave, paid or unpaid options.
Open calculatorWork out statutory holiday entitlement for common UK working patterns, including days, hours and starter scenarios.
Open calculatorPro-rate a full-time holiday allowance for someone who works fewer days or hours than a full-time employee.
Open calculatorCompare holiday accrued by the leaving date with holiday already taken, then work out pay in lieu or overtaken leave.
Open calculatorEstimate a week of holiday pay using the 52-week reference period approach, including regular pay components where relevant.
Open calculatorCalculate the 12.07% holiday pay line for eligible irregular-hours and part-year workers, with a payslip-style result.
Open calculatorCount working days between two dates, with weekends and UK bank holidays handled separately by region.
Open calculatorScore sickness absence patterns with B = S² × D, see the working, and understand sensible trigger thresholds and the caveats before acting on a score.
Open calculatorCalculate Statutory Sick Pay under the 2026 rules: day-one entitlement, £123.25 flat rate or 80% AWE for lower earners, 28-week maximum.
Open calculatorWork out total SMP cost across all 39 weeks, how much HMRC refunds at 92% or 109%, and the net cost to the business. Updated for the £194.32 rate.
Open calculatorFind the statutory minimum notice period under ERA 1996 s.86 for employer or employee, based on continuous service length. Working shown.
Open calculatorWork out the total payroll value of your team's annual leave, the cost per employee and leave as a percentage of your salary bill.
Open calculatorThe fastest way to get the right answer is to start with the situation, not the formula.
Most holiday problems do not start with a clean formula. They start with a messy workplace question: someone joined mid-year, someone works three days a week, someone is leaving, or payroll needs a holiday pay figure.
That is why each calculator explains the calculation, shows the working and links to the matching plain-English guide.
A calculator is useful for working out a figure. But the record still needs to be managed after that: allowance set, requests approved, bank holidays shown, sickness separated and remaining balance kept up to date.
That is where a leave tracker matters. Book Time Off keeps employee allowances, approved leave, leave types and team calendars in one place.
These calculators are written for practical use, but the underlying guidance is checked against official UK sources wherever possible.
| Source | Used for | Link |
|---|---|---|
| GOV.UK holiday entitlement calculator | Statutory annual leave entitlement, working patterns and starter/leaver checks. | Official calculator |
| GOV.UK bank holidays feed | UK bank holiday dates by England and Wales, Scotland and Northern Ireland. | Official JSON feed |
| ACAS holiday entitlement guidance | Plain-English employer guidance on holiday entitlement and taking holiday. | ACAS guidance |
| GOV.UK holiday pay reforms guidance | Holiday pay and entitlement rules for irregular-hours and part-year workers. | GOV.UK guidance |
| ACAS rolled-up holiday pay guidance | Rolled-up holiday pay conditions, payslip separation and worker categories. | ACAS guidance |
The calculators give you the number. These guides explain the employer rules, examples and common mistakes behind the number.
Requests, approvals, clashes, records and tracking for small UK teams.
EntitlementThe foundational guide to 5.6 weeks, 28 days, working patterns and statutory holiday entitlement.
Part-timeHow to calculate pro-rata holiday, handle bank holidays and avoid unfair part-time treatment.
LeaversHow to handle accrued holiday, untaken leave, overtaken holiday and final pay calculations.
Irregular hoursPost-April 2024 rules, 12.07% accrual, rolled-up pay and worked examples.
AbsenceSickness, return-to-work meetings, trigger points, reasonable adjustments and records.
PoliciesAnnual leave, sickness absence, family leave, compassionate leave, dependants and TOIL.
Yes. The Book Time Off calculators are free to use, with no email signup required to see the result. Each calculator also shows the working so employers can understand the calculation rather than just copy a number.
The calculators are designed to help UK employers understand common annual leave and holiday pay calculations. They are not legal advice. For complex cases, check the contract, use official GOV.UK or ACAS guidance, and take professional advice where needed.
Use the part-time holiday calculator if you are pro-rating a full-time allowance to a part-time working pattern. Use the annual leave entitlement calculator if you need a broader statutory holiday calculation with working days, hours or starter scenarios.
Use the leaver holiday pay calculator if you need to compare holiday accrued by the leaving date against holiday already taken, then work out the pay in lieu or overtaken holiday position.
Use the rolled-up holiday pay calculator if you are paying an eligible irregular-hours or part-year worker an extra holiday pay line each pay period. Use the holiday pay calculator if you need a week's holiday pay under the 52-week reference period approach.
No. A calculator helps you work out a figure at a point in time. A leave tracker helps you keep allowances, bookings, approvals, bank holidays and remaining balances up to date for the whole team.
Yes. The standalone calculator pages are designed for practical use and include shareable calculation links where supported. That means you can send the calculation to a colleague, manager, bookkeeper or payroll contact.
Once you know the right allowance, Book Time Off is where you keep it clean. Set custom annual allowances per person, approve requests in one click, view the whole team on a calendar or wallchart, and let UK bank holidays load automatically.