What This Calculator Does

Calculate one explicit datetime interval or a weekly or biweekly time card. Deduct multiple breaks and read daily and total net time as HH:MM and decimal hours. A two-week card also shows separate week totals.

When to Use It

Use it for shift records, lunch deductions, project hours and preliminary billing. Convert a pay scale with salary to hourly. Decide overtime eligibility separately using the applicable contract and local rules.

Inputs Explained

Single intervals use the browser’s local timezone and explicit dates, with a 366-day maximum. Weekly cards have seven rows and biweekly cards fourteen; each row is one shift of at most 24 hours. Blank rows are days off, but incomplete rows are errors. Mark next-day end for overnight cards. Enter up to ten breaks as whole minutes separated by commas, such as 30, 15. Break totals cannot exceed the shift or 1440 minutes. In interval mode break input is used only when deduction is checked.

How the Calculation Works

Elapsed minutes = end minus start. Net minutes = elapsed minutes minus total breaks. Decimal hours = net minutes/60. HH:MM separates whole hours and remaining minutes. Week totals sum the corresponding seven rows. Time cards compare clock times without timezone or daylight-saving adjustments; single datetime intervals compare actual local timestamps, so the modes can differ on a daylight-saving transition.

Example

Monday through Friday, 09:00–18:00 with 30, 30 minutes of breaks, gives eight net hours per day. Leave weekends blank: the week is 40:00 or 40.0000 hours. Two identical weeks total 80:00. An overnight 22:00–06:00 shift with next-day end and 30, 15 breaks gives 7:15 or 7.25 hours.