TimeMathNow is a focused set of time and work-hours calculators. It’s built for people who deal with hours every week: hourly workers checking their pay, supervisors approving timesheets, small-business owners running payroll, and anyone who needs to know how long something took or when it will finish.
What makes these tools different
- They work straight away. No sign-up, no pop-ups, no “click to start”. Results update as you type.
- They handle real-world cases. Overnight shifts, split shifts, unpaid breaks, overtime rules, daylight-saving changes and public holidays are all handled automatically.
- Payroll-friendly results. Every work-hours result is shown in hours and minutes and in decimal hours, because that’s what payroll systems ask for.
- Print, copy and share. Print a clean time card, copy the totals into a message, or send a link that opens the calculator with your numbers filled in.
- Built for phones. Large buttons, number keyboards and layouts that fit a small screen.
How we check accuracy
The calculations behind every tool are covered by automated tests that run before each update, including overnight shifts, overtime splits, minute-to-decimal rounding, military-time edge cases, leap years, and U.S. and UK holiday dates checked against official calendars. Holiday dates are calculated by rules rather than typed in, so they stay correct year after year.
Your privacy
There are no accounts, and the numbers you type are worked out in your own browser rather than sent to us. Your last inputs can be remembered on your own device for convenience, and every tool has a Clear button. See the privacy policy for details, including how ads work on this site.
Please note
The calculators give estimates for planning and checking. They aren’t legal, tax or payroll advice. Overtime and break rules vary by state, country and employer, so check with your employer or an official source before relying on a result. See our terms.
All tools
- Hours CalculatorAdd up hours worked across one or more shifts, with breaks and pay.
- Time Card CalculatorA full week or two of shifts with lunch, overtime and a printable card.
- Minutes to Decimal HoursConvert hours and minutes to decimal hours for payroll, and back.
- Time Duration CalculatorExact time between two clock times, or two dates and times.
- Time CalculatorAdd and subtract hours, minutes and seconds, or shift a clock time.
- Business Days CalculatorCount working days or add them to a date, with US and UK holidays.
- Military Time ConverterSwitch between 12-hour and 24-hour time, with a printable chart.
Found a mistake or have an idea for a tool? Get in touch.