Free time card, work-hours, overtime and date calculators, each one built from the same rule the Department of Labor uses, not a house shortcut. Add up clock-in/out times, handle breaks and overnight shifts, and get weekly totals and pay instantly. No more squinting at a calculator at 11pm, doing the same sum four times, and getting four different answers.
From a single shift to a full week. Totals and pay in seconds, no mental math required.
Hours worked between a start and end time, minus breaks.
Open calculator →Add up daily hours into a weekly total with pay.
Open calculator →A full week of clock-in/out times with daily and weekly totals.
Open calculator →Overtime pay at 1.5× or 2× your regular rate.
Open calculator →Days between dates, or add and subtract days.
Open calculator →Working days between dates, or add business days skipping weekends and holidays.
Open calculator →Enter your times and we handle breaks, overnight shifts, overtime and pay, accurately and instantly, with nothing stored. You bring the hours, we bring the arithmetic. Everybody wins, especially you at 5pm on a Friday.
Overtime here follows the federal Fair Labor Standards Act's time-and-a-half rule over 40 hours in a workweek, with the Department of Labor fact sheet linked on the editorial standards page, so you can check the rule against the source instead of taking a widget's word for it.
The 2026 work hours and overtime dataset lists the current BLS average workweek and the federal overtime threshold with their observation dates, plus a downloadable CSV, so a number you cite traces back to a named release.
Guides like how to calculate hours worked and how to calculate overtime pay walk the math by hand, decimal conversion and all, so you can catch a rounding error on your own pay stub instead of trusting a black box.
Every time tool on this site runs the same core method: convert clock times to minutes since midnight, do plain arithmetic on whole minutes, and convert back at the end. A 9:00 AM punch becomes 540 minutes; a 5:30 PM punch becomes 1,050. Working in minutes is what keeps 7 hours 45 minutes from being mistyped as 7.45 hours (which is 7 hours 27 minutes, and a shortfall of 18 minutes of pay). When a shift ends on a smaller number than it started, the tools add 24 hours to the end time, so an overnight 10:00 PM to 6:30 AM shift computes to 8.5 hours instead of a negative number.
Results appear in two formats side by side, hours-and-minutes for humans and two-decimal hours for payroll, because the conversion between them is where most timesheet errors live. The tools themselves do not round your punches; if your employer's system rounds to the nearest quarter hour, as federal regulation permits when it averages out fairly, that happens before your numbers ever reach this page. Overtime, where a tool computes it, follows the federal FLSA standard: time and a half for hours past 40 in a workweek. States that add daily overtime on top, California most prominently, are flagged in the notes on the relevant pages rather than silently baked into a total.
TimeCardTools is built and maintained by the Encore Editorial team; the authors page says who wrote what, and the editorial standards page explains how figures get sourced and rechecked. Guides carry a byline and a dated update line. When a rule or a reference number changes, the page changes, and the date under the byline moves with it.
Thirteen calculators is a lot of doors. The fastest way through is the question that brought you here.
"My paycheck looks wrong." Work smallest to largest. Check the one suspicious day with the Time Calculator, rebuild the whole week in the Time Card Calculator, and if the week crossed 40 hours, price the difference with the Overtime Calculator. Most disputes end at the first step: a mistyped punch, or an unpaid lunch deducted twice.
"I need a date." Deadline arithmetic turns on one detail, whether weekends count. Notice periods and contract windows measured in calendar days go to the Date Calculator. Anything measured in business days, a ten-business-day response window for instance, belongs in the Business Days Calculator, which also knows where the federal holidays fall.
"The formats don't match." A timesheet in hours and minutes feeding a payroll field that wants decimals is the Decimal Hours Calculator. A schedule written in 24-hour time is the Military Time Converter. A meeting proposed in somebody else's afternoon is the Time Zone Converter.
Still not sure? Open the Time Card Calculator. It is the hub the rest of the site orbits, and a filled-in week answers most of the other questions on the way past.
Each calculator page carries a worked example computed by hand before any code ran, and the tool has to reproduce that example exactly before a change ships. When a result involves a rule rather than plain arithmetic, the rule is cited where it is used: the overtime pages point to the Department of Labor's FLSA guidance, the rounding discussion points to the actual regulation at 29 CFR 785.48, and the 2026 work-hours dataset names the release each figure came from and the date it was observed.
Guides carry a byline and a dated update line, and the date moves when the content does, not on a schedule. If you find a figure here that disagrees with its cited source, say so through the contact page; the page gets corrected, not defended. Two boundaries stay fixed regardless: everything you type stays in your browser and is never sent to a server, and every output is a planning estimate rather than a payroll record or legal advice. For the disputes that matter, the cited primary source outranks this site, and the links exist so you can go check.