True Employee Cost Calculator
Salary is only the starting point. Add employer pension, insurance, payroll taxes, and fixed costs to see what an employee really costs.
Overtime Pay Calculator
Work out weekly, monthly, and annual pay with overtime hours at time-and-a-half (1.5×) and double time (2×).
Pro-Rata Salary Calculator
Convert a full-time salary to a part-time equivalent by FTE fraction or days per week — with the hourly rate included.
Annual Leave Calculator
Calculate entitled annual leave or PTO days and hours for part-time staff, part-year joiners, and leavers.
Meeting Cost Calculator
See what a meeting really costs based on attendees' time — and what a weekly meeting adds up to over a year.
Pay Rise Calculator
Apply a percentage pay rise or work backwards from a target salary, with monthly and hourly differences shown.
Headcount Budget Planner
Plan your people budget: add roles, headcount, average salaries, and on-costs to get a total annual budget.
Why use BizOpsKit?
You set the rates — the tools do the maths
Tax rates, pension contributions, and payroll rules differ between the UK, the US, and everywhere else, and they change over time. BizOpsKit never hard-codes them: you enter your own percentages and figures, so the results match your country, your scheme, and your payroll.
Built for budget conversations
Every calculator shows its formula and a worked breakdown, so you can explain a number in a meeting instead of just presenting it. Hiring managers, founders, and finance teams can sanity-check a figure in under a minute.
Private by design
Salary figures are sensitive. Nothing you type is uploaded, saved, or shared — all calculations run in your own browser, and closing the tab erases everything.
Frequently asked questions
Is BizOpsKit really free?
Yes. Every calculator is completely free, with no account, subscription, or usage limit.
Does BizOpsKit work for both the UK and the US?
Yes. The tools are deliberately rate-driven: you enter your own pension, insurance, and payroll-tax percentages, so they work with UK employer costs, US employer costs, or any other country's.
Is my salary data saved anywhere?
No. All calculations happen in your browser. We have no accounts, no database, and nothing you enter is sent to a server.
Can I rely on these numbers for payroll?
Treat the results as planning estimates. Always run final figures through your payroll system or confirm them with a qualified professional.