Free HR and Psychology Calculators
What free HR calculators are available here?
Forty-six, covering hiring and selection, absence and pay, employment law in Pakistan, India, the UK, the US, Canada and the EU, I/O psychology methods, and the ways a number can mislead you. Each answers one specific question — whether a selection rate clears the four-fifths rule, what a departure really costs, whether an improvement was ever real. They run entirely in your browser: nothing is uploaded, nothing is stored, and there is no sign-up.
Most business calculators take four numbers and print a fifth. These print the number and then tell you what it does not mean.
Eight of them use the same arithmetic as the paid tool they link to, so the free version cannot drift away from the one people buy. The other four are companions to a paid tool, and say so. The thirty-four newest, on employment law and regulation in Pakistan, India, the UK, the US, Canada and the EU, and on I/O psychology methods, are free in full; each cites the law or the papers behind it and the date it was last checked.
Built by Muhammad Shahzeb Anwar, MSc Industrial and Organizational Psychology. Every one of these refuses to answer at least one question people expect it to answer, and says why.
Forty-six tools, grouped by the question you arrived with
Pakistan employment law6 tools
What the law entitles a worker to, worked out from the Acts themselves, with the province selected.
India3 tools
The four Labour Codes in force since November 2025, and the POSH Act's Internal Committee.
UK employment law4 tools
The 2026 and 2027 changes from the Employment Rights Act 2025, and the working time limit.
United States5 tools
Pay transparency, AI in hiring, non-competes, layoff notice and family leave, state by state.
Canada4 tools
Every province and territory: what is owed when a job ends, on holidays and for vacation, and what a job posting must say.
EU regulation and hiring law5 tools
The AI Act, the Pay Transparency Directive, and the questions regulators ask about hiring.
I/O psychology and psychometrics7 tools
The calculations behind content validity, selection utility, job design, motivation and team-level data, with the papers they come from.
Hiring and selection4 tools
Whether a process is fair, whether it works, and what it is worth.
Absence, pay, turnover and engagement4 tools
The people numbers that get reported upward, and how each can mislead.
Reading a number without being fooled by it4 tools
Four ways a figure can be true and still mean the opposite of what it looks like.
Why a shop full of tools gives some away
There is a straightforward answer and it is worth saying plainly: a calculator you can use without paying is how you find out whether the paid one is any good. Where a free tool has a paid version, it runs the identical arithmetic: the paid version does more — more groups, saved records, control limits, a report you can hand to somebody — but it does not compute a different answer. The rest are companions, answering the question next to the one a paid tool answers, and each of those pages says so.
There is a second reason, and it is the one that decided which tools got built. Search for a free turnover cost calculator and you will find nine of them on the first page. Search for a regression to the mean calculator and you will get linear regression, which is a different thing entirely. Where a tool is a generic computation the space is full; where it is a named misunderstanding there is nothing at all. That gap is where these were built.
The consequence is that several of these calculators exist nowhere else on the internet, and that the answer they give is often the opposite of what the person asking expected. A test that is 80% accurate does not give you 80% good hires. Two groups can both improve while the combined figure falls. A better hiring method is worth nothing at all if you hire everyone who applies.
About these calculators
Are these calculators really free?
Yes. There is no sign-up, no email wall and no trial. Nothing you type is sent anywhere - every calculation runs in your own browser, and closing the tab discards it.
Who built them?
Muhammad Shahzeb Anwar, MSc Industrial and Organizational Psychology. Where a free tool has a paid version, the two use the same arithmetic, so they cannot drift apart. The others are companions to a paid tool rather than cut-down copies of one, and each page says which it is.
Can I use the results in a report?
Yes, and every tool carries a citation block showing how to reference it. Say which figures you put in, because most of these answers depend on an assumption you chose rather than on a measurement.
Which one should I start with?
If you are defending a hiring process, start with the adverse impact calculator. If you are being told an intervention worked, start with regression to the mean. If somebody has quoted you a rating or a percentage, start with review rating confidence. If you are settling a final payment for someone leaving a job in Pakistan, start with the final settlement calculator.