TimeCardTools is a set of free calculators for the everyday math of work time: hours worked, weekly time cards, overtime pay, decimal-hour conversions, military time, time zones, business days and dates. Enter your times, get the total, and check a number before it goes on a timesheet or a paycheck.
The reason the site exists is plain. Most time math is simple arithmetic that is easy to get wrong in small ways, and small ways add up. Read 7:45 as 7.45 hours instead of 7.75 and you have shorted half a week over a month. Forget that overtime starts at 40 in a week, not 80 in a pay period, and a paycheck comes up light. A calculator that handles the conversions and the overnight wrap, and shows the worked example, settles the question fast.
Chris Terry built and runs TimeCardTools through Encore Promotional Products, alongside the sibling calculator and reference sites linked in the footer. There is no anonymous "team" behind the tools here, one person is accountable for the formulas and for fixing them when a reader flags a problem. TimeCardTools is not a payroll provider, a staffing agency, or a paywall; every tool is open to anyone, with no sign-up, and runs entirely in your browser, so nothing you type is stored or sent anywhere. See the authors page for who writes the guides on this site and what gets checked before a page publishes.
Every tool uses standard, published methods rather than house rules. Hours worked is end time minus start time, with unpaid breaks removed, converted to decimal hours by dividing minutes by 60. Overtime follows the federal Fair Labor Standards Act: at least one and one-half times the regular rate for hours over 40 in a workweek, with the workweek defined as a fixed, recurring 168 hour period. Military time conversion subtracts 12 from afternoon hours; time zone conversion works through UTC so daylight saving is handled by the date. Where a figure is a legal rule, we cite the Department of Labor or the relevant primary source on the page. The full method, with citations, is on our editorial standards page.
Results are estimates for your own planning. They show gross figures, not take-home pay, because withholding depends on your filing status and deductions. State law can also be more generous than the federal floor, with daily overtime in California and a few other states, and your employer's rounding and break policies may differ. For anything that affects your actual pay, confirm the final number with your employer or payroll department.
Display ads and a handful of affiliate links to related payroll and HR services cover the cost of running this for free. Clicking through and signing up or buying something may earn us a commission, at no added cost to you. Nobody pays us to change a rounding rule, skip a citation, or feature a product; the same overtime math applies whether or not you ever click an ad. The disclosure sits in the footer of every page rather than a submenu somewhere.