Punch Clock Math

Punch Clock Math is a set of free time card, hours and overtime calculators that apply the federal rule and each state's own overtime rules, for all 50 states and DC. It adds up time cards the way payroll does, in whole minutes, across midnight and on daylight-saving nights, and splits the hours into regular time and overtime.

It has 18 calculators, including a time card calculator, hours, time-to-decimal and military time converters, time clock rounding, overtime by state, a no-tax-on-overtime deduction calculator, unpaid overtime, regular rate with bonuses, hourly and salary conversions, pay raises, gross pay, business days, PTO accrual and work hours in a year, plus two reference tables: overtime laws by state and break laws by state.

Every rule comes from a primary source and is shown with the date it was checked. The site is written for hourly workers checking their own time and pay, and for small-business owners who run payroll themselves. No calculator needs an account, and what you type stays in your browser unless you press Save. It is not a law firm, payroll company or tax preparer; results are estimates, not legal or tax advice.