How to Calculate Work Hours (Free Time Card Calc)

Adding up hours by hand is fiddly, especially across a week with unpaid breaks and times crossing noon or midnight. This guide explains how to total work hours correctly and walks you through the Time Card Calculator, where you enter clock-in, clock-out and breaks for each day to get your weekly hours and estimated pay from an hourly rate. It is a free online timesheet calculator that runs in your browser with no sign-up.

How work hours are calculated

The basic formula for a day is:

Hours worked = (clock-out - clock-in) - unpaid break

The catch is the math is in hours and minutes, not decimals. Subtract the start time from the end time, then subtract any unpaid break. To convert minutes to decimal hours for pay, divide minutes by 60: 30 minutes is 0.5 hours, 15 minutes is 0.25. Pay is then hours worked multiplied by your hourly rate. The calculator does the time arithmetic and the decimal conversion automatically.

How to use the Time Card Calculator

Fill in your week in a few minutes:

1. Open the Time Card Calculator.
2. For each day, enter your clock-in and clock-out times.
3. Enter any unpaid break (for example a 30-minute lunch).
4. Add your hourly rate to estimate pay.
5. Read your daily hours, weekly total and estimated pay.

It handles shifts that cross midnight and times around noon, so you do not have to worry about AM and PM math.

A worked example

Suppose you work Monday to Friday from 9:00 to 17:30 with a 30-minute unpaid lunch.

• Gross per day: 17:30 minus 9:00 = 8.5 hours
• Minus break: 8.5 - 0.5 = 8.0 hours
• Weekly total: 8.0 x 5 = 40 hours

At 18 dollars per hour, estimated pay is 40 x 18 = 720 dollars for the week. If one day you stayed to 18:00, that day becomes 8.5 hours and the week totals 40.5 hours, lifting pay to 729 dollars.

Minutes to decimal hours reference

Payroll uses decimal hours, so it helps to know common conversions:

The calculator converts automatically, but this table is handy for double-checking a payslip.

Use cases

A time card calculator is useful for:

• Hourly workers totalling a weekly timesheet
• Freelancers billing clients by the hour
• Small business owners running simple payroll
• Checking that a paycheck matches the hours you worked
• Tracking overtime above a 40-hour week

For planning gaps between shifts or project durations, the Time Duration Calculator helps, and the Salary Calculator converts an hourly rate to annual pay. Browse more in calculators.

Converting clock time to decimal hours

Payroll runs on decimal hours, not hours and minutes, so 8 hours 30 minutes is entered as 8.5, not 8.30. The conversion is to divide the minutes by 60. This is where hand calculations most often go wrong, because people treat the minutes like a decimal already and record 7:45 as 7.45 instead of the correct 7.75. To convert a full day, change the minutes part first, then add it to the whole hours. For a shift of 7 hours 20 minutes: 20 / 60 = 0.33, so the day is 7.33 hours. Here is a fuller reference than the rounded table above:

The calculator converts every entry for you, but understanding the divide-by-60 rule lets you sanity-check a payslip in seconds.

Handling overnight shifts and breaks

Shifts that cross midnight need care, because clock-out is a smaller number than clock-in. Suppose you start at 22:00 and finish at 06:30 the next morning. Subtracting directly gives a negative number, so add 24 hours to the end time first: 06:30 becomes 30:30, then 30:30 minus 22:00 is 8 hours 30 minutes, or 8.5 hours. Subtract any unpaid break from there. Breaks themselves have rules worth knowing: short paid rest breaks count toward worked time, while a genuine unpaid meal break does not and should be subtracted. Consider a 9-hour span with a 1-hour unpaid lunch and two paid 15-minute breaks. You subtract only the lunch, giving 8 hours of paid time; the two paid breaks stay in because they are already inside the span and are not deducted. Always confirm which breaks your employer treats as paid before you total the week.

Calculating overtime pay

In many places, hours worked beyond a weekly threshold, commonly 40, are paid at a higher rate, often 1.5 times the regular rate (time and a half). To work out gross pay with overtime, split the week into regular and overtime hours, pay each at its rate, then add them. Suppose you worked 46 hours in a week at a base rate of 20 dollars per hour, with overtime above 40 paid at 1.5 times.

That is 980 dollars gross, before tax and deductions. Note the overtime threshold and multiplier depend on your local laws and contract, so check yours. Add up your daily hours in the calculator first, then apply the regular and overtime split to the weekly total.

Tips and privacy

Keep your timesheet accurate:

• Confirm whether breaks are paid or unpaid; only subtract unpaid ones.
• Use 24-hour time, or be careful with AM and PM, for shifts crossing noon or midnight.
• Track overtime separately, since it is often paid at a higher rate.

The Time Card Calculator runs entirely in your browser, so your hours and pay details are never uploaded or stored, keeping them private. It is free with no sign-up. Bookmark the Time Card Calculator for each pay period. See all tools for more.