Free HR calculators (UK)
Quick, accurate answers to the sums UK employers do every week - built on current statutory rules and updated each April.
Pick a calculator
Free, no sign-up, and each one explains the rules behind the result.
Overtime pay calculator
Hours × rate × your contract's multiplier - time and a half, double time or flat - with the TOIL-equivalent alongside.
Calculate overtime pay → Sickness & absenceBradford Factor calculator
S² × D with exclusions built in - plus what published thresholds actually say, which is that they disagree wildly.
Calculate a score → Managing peopleStaff turnover calculator
Total and voluntary turnover, retention and replacement cost - against real CIPD sector figures, not a vague average.
Calculate turnover → Performance9-box grid (interactive)
Plot your team on performance and potential and get the conversation each box calls for - plus the uses to avoid.
Open the grid → HiringCost per hire calculator
Agency fees, advertising, tools and the internal interview time most employers forget - divided by hires made.
Calculate cost per hire → Sickness & absenceAbsence cost calculator
What sickness costs in pounds - salary for days not worked, cover, and the SSP you can't reclaim.
Calculate the cost → Sickness & absenceAbsence rate calculator
Percentage of working time lost and days per employee, benchmarked against the current UK average of 9.4 days.
Calculate absence rate → Sickness & absenceSSP cost calculator (2026 rules)
Day-one sick pay at the lower of £123.25 or 80% of weekly earnings - see what any absence actually costs your business.
Calculate SSP cost → Pay & ratesTrue cost of an employee
Salary + 15% employer NI + pension, with an Employment Allowance toggle - what a hire really costs in 2026/27.
Calculate the true cost → Pay & ratesMaternity pay employer cost
Gross SMP over 39 weeks and the net cost after the HMRC reclaim - small employers usually get back more than they pay.
Calculate SMP cost → Pay & ratesRedundancy cost (employer total)
Statutory pay with the 2026/27 caps, plus the notice and holiday payout the gov.uk calculator leaves out.
Calculate the full cost → Pay & ratesPENP calculator
The part of a termination payment taxed as earnings - and what is left for the £30,000 exemption.
Calculate PENP → Pay & ratesNotice pay
The statutory ladder, contractual overrides, and what paying in lieu actually costs.
Calculate notice → Employment lawNotice period dates
From notice date to last day of employment - the day-after start rule and month counting done right.
Work out the last day → Pay & ratesPayroll cut-off dates
Six months of cut-offs and paydays from your payday rule and processing lead time.
Build the calendar → Pay & ratesPaternity pay (SPP)
The weekly rate, the HMRC reclaim - and the 2026 catch: leave is day-one, pay isn't.
Calculate SPP → Time offIrregular hours holiday (12.07%)
Accrued hours and pay for zero-hours and part-year workers, with the rolled-up rules.
Calculate accrual → Pay & ratesSalaried minimum wage checker
Is that salary legal at the hours actually worked? Unpaid overtime and deductions included.
Check compliance → Time offAnnual leave purchase
The monthly cost of buying extra days, and the employer's NI saving through salary sacrifice.
Calculate the scheme → Time offTerm-time only holiday
School and nursery patterns under the post-Brazel 12.07% rules - accrued hours and their pay value.
Calculate term-time → Time offLeaver holiday (final pay)
Accrued to the leaving date, days owed or overtaken, and when a deduction is actually lawful.
Calculate final pay → Time offPro-rata holiday calculator
Part-timers, mid-year starters and leavers - statutory 5.6 weeks or your own allowance, rounded up to the half day.
Calculate entitlement → Expenses & travelMileage claim calculator
AMAP at 55p and 25p, including the claim that crosses 10,000 miles mid-year, passenger payments, and whether you owe tax or are owed relief.
Open the calculator → Benefits & pensionsPension contribution calculator
Contributions on qualifying earnings, total or basic pay, which auto-enrolment category a worker falls into, and what salary sacrifice saves in NI.
Open the calculator →Also here: All free resources · 66 guides · 30 templates · 12 comparisons
CoDash does these sums automatically
Entitlements from working patterns, overtime to TOIL or payroll at your rates, absence costs visible at a glance - for the whole team, all year.