Time Card Calculator
Enter a week of start times, end times, and breaks. Get exact daily hours, a weekly total, the overtime split, and pay, all handled automatically, rounding included.
Quick answer: To total a time card, subtract start time from end time for each day, subtract unpaid breaks, convert minutes to decimal by dividing by 60, and add up the week. Overtime kicks in after 40 hours per week under standard U.S. federal rules. Enter your own week below for exact numbers.
Your weekly time card total will appear here.
What is a time card calculator?
A time card calculator totals the hours behind a work week, taking daily start times, end times, and unpaid breaks and turning them into exact decimal hours, a weekly total, and, if you want it, a full pay breakdown including overtime. It replaces the manual math of subtracting punch times by hand, which is exactly the kind of base-60 time math that trips people up under a payroll deadline.
This tool is useful for employees checking their own hours before submitting a timesheet, freelancers totaling billable time, and small business owners doing a quick manual check without needing full payroll software for a single pay period.
How to calculate hours from a time card
Start by subtracting the start time from the end time for each day to get gross time worked. Subtract any unpaid break time from that number to get net hours. Then convert minutes to decimal hours by dividing by 60, since payroll systems work in decimal hours rather than clock-format minutes: 15 minutes becomes 0.25 hours, 30 minutes becomes 0.5 hours, and 45 minutes becomes 0.75 hours. Add the decimal totals for every day to reach your weekly total.
Example: Clock in 9:00 AM, clock out 5:30 PM, 30-minute unpaid lunch.
Gross time: 8 hours 30 minutes. Minus 30-minute break: 8 hours net.
Repeated five days: 8 ร 5 = 40.0 total hours for the week.
How rounding actually works
Many workplaces round punch times to the nearest 5, 10, or 15 minutes instead of tracking to the exact minute, mostly for simplicity in older manual systems. U.S. Department of Labor guidance allows this practice as long as it's applied consistently and doesn't systematically shortchange employees over time, meaning the rounding should even out in the employee's favor roughly as often as it doesn't, rather than always rounding down.
This calculator applies your selected rounding increment to each day's net hours after breaks are subtracted, giving a close, practical approximation of how most simple rounding-based payroll systems handle a standard shift.
How overtime is calculated
Under the federal Fair Labor Standards Act, most non-exempt employees in the U.S. are entitled to overtime pay of at least 1.5 times their regular hourly rate for any hours worked beyond 40 in a single workweek, defined as any fixed, regularly recurring period of 168 hours. This calculator applies that standard 40-hour threshold automatically whenever you enter an hourly rate, splitting your total into regular and overtime hours and calculating pay for each separately.
Non-exempt employees, which includes most hourly workers, are entitled to this overtime protection. Exempt employees generally are not, and typically must meet three conditions: earning at least a set minimum weekly salary, being paid on a salary rather than hourly basis, and performing primarily executive, administrative, or professional duties. Manual labor and first-responder roles remain non-exempt and entitled to overtime regardless of how highly paid the role is.
Some states apply stricter rules on top of the federal standard, such as daily overtime after 8 hours in a single day rather than only weekly overtime after 40. This calculator reflects the federal weekly standard only, so check your state's labor department if a daily overtime rule might apply to you.
A surprisingly interesting history of the time card
Time cards trace back further than most people expect. The rise of factory labor during industrialization created a real need to track workers' hours accurately, and in 1894, Daniel M. Cooper's Rochester Time Recorder became the first machine to print exact clock-in and clock-out times directly onto a card each employee carried between shifts.
It wasn't the first attempt, though. In 1888, William Bundy's Key Recorder printed a time and employee key number onto a paper tape, while Alexander Dey's Dial Recorder had workers select their number on a large dial and push a pointer arm to print the exact time. By the early 20th century, IBM had built an entire Time Recorder Division around the technology, at one point even printing arrival times in red ink when an employee clocked in late. Modern systems have since moved on to RFID badges and biometric scanners, but the underlying question, exactly how many hours did someone actually work, hasn't changed at all.
Turning a week into a pay period
A single time card only covers one week at a time. If you're trying to figure out how many weeks or days fall inside a full pay period, or how many workdays remain before a deadline, the Days Between Dates Calculator handles that calendar-level math, complementing this tool's within-a-week hour totals.
And if you're curious what portion of your total week actually went to work versus everything else, once you have your weekly hours total from this calculator, the Time Percentage Calculator can turn that number into a clear percentage of your week, useful for spotting a pattern before it becomes an actual work-life balance problem.
Time Card Calculator FAQs
How do I calculate hours worked from a time card?
Subtract the start time from the end time for each day, then subtract any unpaid break time from that result to get net hours worked. Convert minutes to decimal by dividing by 60, so 15 minutes becomes 0.25 hours, 30 minutes becomes 0.5 hours, and 45 minutes becomes 0.75 hours. Add up the decimal hours for every day in the week to get your total weekly hours.
What does it mean to round time card entries?
Rounding time card entries means adjusting recorded clock-in and clock-out times to the nearest set increment, commonly 5, 10, or 15 minutes, rather than tracking to the exact minute. U.S. Department of Labor guidance allows rounding as long as it's applied consistently and doesn't systematically shortchange employees over time, meaning rounding should even out in the employee's favor about as often as it doesn't.
How is overtime calculated on a time card?
Under the Fair Labor Standards Act, most non-exempt employees in the U.S. are entitled to overtime pay of at least 1.5 times their regular hourly rate for any hours worked beyond 40 in a single workweek. A workweek is defined as any fixed, regularly recurring period of 168 hours, not necessarily Monday through Sunday. This calculator applies that standard 40-hour threshold automatically when you enter an hourly rate.
What's the difference between an exempt and non-exempt employee?
Non-exempt employees are entitled to both minimum wage and overtime pay under the FLSA, and most hourly workers fall into this category. Exempt employees are not entitled to overtime pay, and generally must meet three conditions: earning at least a set minimum salary, being paid on a salary rather than hourly basis, and performing primarily executive, administrative, or professional duties. Manual labor and first-responder roles are generally non-exempt regardless of salary or duties.
Should I round each punch time or round the total for the day?
Most payroll systems round the individual clock-in and clock-out punches rather than the final daily total, since rounding punches keeps the practice consistent and auditable across every entry. This calculator rounds each day's net time to the selected increment after subtracting breaks, which produces a very close approximation for typical shift lengths and is simpler to verify by eye.
Can this calculator handle an overnight shift that crosses midnight?
Yes. If your end time is earlier than your start time, such as clocking in at 10:00 PM and out at 6:00 AM, the calculator automatically treats the shift as crossing into the next day and calculates the correct total hours rather than returning a negative or nonsensical result.
Does this calculator handle state-specific overtime rules?
No. This calculator applies the standard federal FLSA threshold of overtime after 40 hours in a workweek. Some states have additional rules, such as daily overtime after 8 hours worked in a single day, that go beyond the federal standard. If your state has stricter overtime rules, check your state labor department's guidance, since this calculator's overtime split reflects federal rules only.
Where did time cards and time clocks come from?
Time cards trace back to the late 19th century, driven by industrialization and the growing need to track factory labor accurately. Daniel M. Cooper's Rochester Time Recorder, introduced in 1894, printed precise clock-in and clock-out times directly onto a card each worker carried. Earlier machines, including William Bundy's 1888 Bundy Key Recorder and Alexander Dey's Dial Recorder, laid the groundwork, and IBM later built an entire Time Recorder Division around the technology in the early 20th century.
This tool is for educational purposes only. Always verify important results with a qualified professional.
