Welcome to our free HR calculators. Each tool is free to use and shows its working, which means you can check the result and explain it to a colleague. Pick a group below, enter your figures and read the answer.
Free HR calculators for UK pay and leave
These free HR calculators cover pay, holiday, sickness and notice for UK employers and employees. Each one uses the current UK rules, which means you can use the answer in a pay review or a conversation with payroll.
- Pro Rata Salary Calculator UK: turn a full-time salary into pay for part-time hours.
- Hourly Rate Calculator UK: change a salary into an hourly rate, or an hourly rate into a salary.
- Day Rate Calculator: compare a day rate with a yearly income.
- Pay Rise Calculator: see the new salary after a percentage rise.
- FTE Calculator: turn part-time hours into a full-time equivalent.
- Holiday Pay Calculator: work out holiday pay, with the working shown.
- Pro Rata Holiday Calculator UK: find holiday entitlement for part-time staff, starters and leavers.
- Statutory Sick Pay Calculator: work out statutory sick pay from average weekly earnings.
- Bradford Factor Calculator: score absence and see where trigger points fall.
- Notice Period Calculator UK: find the statutory notice for a length of service.
- Employer NI Calculator: estimate employer National Insurance, with Employment Allowance as an option.
- Salary Sacrifice Calculator: see how a salary sacrifice changes take-home pay.
- NHS Pay Calculator 2026/27: check NHS pay by band, including part-time pay.
- Working Days in a Year 2026: count the working days in 2026 for England and Wales.
Free HR calculators for US pay and leave
These free HR calculators cover pay, overtime, leave, survey scores and employer costs for US employees and employers. They use US dollars and US rules, which means you can compare the results with your own payroll records.
- Pay Raise Calculator: turn a percent raise into new pay, or find the percent behind a new salary or hourly rate.
- Overtime Calculator: work out overtime pay at time and a half, double time or your own rate.
- Time and a Half Calculator: see the time and a half, double time and double time and a half rates for any hourly wage.
- Payroll Hours Calculator: add clock-in and clock-out times and work out overtime and gross pay.
- PTO Accrual Calculator: turn a yearly PTO allowance into hours per pay period or per hour worked.
- NPS Calculator: turn survey counts into a Net Promoter Score or an employee NPS.
- Employee Cost Calculator: see what an employee costs a US employer in a year.
- Working Days in a Year 2026: the same page also counts the working days for the US.
Free tools for team and communication
These tools help with the people side of work. They give you ideas and wording you can use as they are, which means you spend less time staring at a blank page.
- Christmas Party Ideas Picker: choose a party idea that suits your team.
- Boss Day Message: pick from 120 ideas for a card, an email or a team note.
Using the free HR calculators well
Rates and thresholds change each tax year, which means you should check any result against the official rules before you act on it. For holiday, the GOV.UK holiday entitlement calculator is a good second check.