Free HR Tools & Calculators
Four free calculators for UK employers. Every rule cited to GOV.UK. No sign-up, no email, no catch.
Getting UK employment maths right is fiddly, and the rules move. Holiday accrues differently for irregular-hours staff. Statutory Sick Pay changed materially in April 2026. Redundancy pay depends on age as well as service. These calculators do the arithmetic and, more usefully, show you the working, so you can check it or paste it into a note for your records.
They run entirely in your browser. Nothing you type is sent anywhere, and you do not need an account.
Holiday entitlement calculator
Works out statutory holiday for full-time, part-time, irregular-hours and part-year workers. Handles pro-rata for mid-year starters and leavers, the 12.07% accrual method, and bank holidays for England and Wales, Scotland and Northern Ireland separately - which most calculators quietly ignore.
Use it when someone joins or leaves partway through your leave year, or when you take on your first irregular-hours worker and the usual sums stop applying.
Statutory Sick Pay calculator
Updated for the 2026/27 rules. The three waiting days and the Lower Earnings Limit were both abolished on 6 April 2026, and SSP became the lower of the flat weekly rate or 80% of average weekly earnings. If your sickness policy still mentions waiting days, it is out of date and underpaying people.
Enter average weekly earnings, qualifying days and days off sick, and it shows the rate, the daily figure and the total.
Working time and rest checker
Checks hours and rest against the Working Time Regulations 1998: the 48-hour average week and its 17-week reference period, 11 hours of rest between shifts, weekly rest, and the 20-minute in-work break.
It also answers the TOIL question honestly. There is no statutory right to time off in lieu in the UK - it is contractual - so the checker tests the rules that actually carry legal consequences instead.
Redundancy pay calculator
Works out statutory redundancy pay from age, length of service and weekly pay, applying the age-banded multipliers and the statutory weekly pay cap.
Why these are free
Because a calculator behind an email form is not a tool, it is a lead magnet with a form attached. These are useful whether or not you ever look at HR Henry.
If you do find yourself running these numbers often, that is usually the point where a spreadsheet stops being the right home for them - and that is what HR Henry is for.
Frequently asked questions
Do I need to sign up to use these calculators?
No. There is no sign-up, no email gate and no account. Every tool runs entirely in your browser and nothing you enter is sent anywhere.
Are the figures kept up to date?
Yes. Every statutory figure lives in one config file with its GOV.UK, legislation.gov.uk or ACAS source, and is reviewed each February when HMRC publishes the new tax year rates. The rates on these pages were last checked on 31 August 2026.
Can I rely on these for a tribunal or a payroll run?
They are accurate guides to the statutory minimum, and each one shows its working and cites its source so you can check it. They are not legal advice, and your contracts may be more generous than the statutory floor.
Which calculator should I use for someone on a zero-hours contract?
Use the holiday entitlement calculator in irregular-hours mode, which applies the 12.07% accrual method. For sick pay, use the SSP calculator - since April 2026 there is no earnings threshold, so casual staff with employee status are far more likely to qualify than they used to be.