TinyTools Work Hours & Pay Calculators

Learn the rules

Guides

Plain explanations of how work-hours and pay calculations work — the rules, the formulas, and the edge cases. Each guide links to the calculator that does the maths for you and cites its primary source (US Department of Labor, IRS, state agencies) so you can check it.

There are 27 guides, grouped below to match the four families of calculators. They are written for the US, with notes for Canada, the UK, and Australia where the rules differ. Everything here is general information, not legal or tax advice — see the Disclaimer.

Hours & timekeeping

Turning clock times into paid hours, and the rules employers follow.

Overtime

The formula, the thresholds, and who is actually entitled to it.

Salary & a work year

Converting between hourly and annual pay, and how many hours a year holds.

Paycheck & deductions

Why take-home is less than gross, and how to read what came out.