Hours Between Times Calculator

Calculate hours between two clock times, including overnight spans, unpaid breaks, decimal-hour output, rounded hours, gross-value notes and a printable shift, appointment, classroom or job-time record.

Hours between times09:15 to 17:45 = 8h 30m elapsed (8.5 h) · minus 30 break minutes = 8 net hours · rounded to 15-minute increment

Start hour0–23Start minuteminEnd hour0–23End minuteminUnpaid breakminRounding incrementmin

Live math canvas

Your numbers, formula and explanation together

Hours Between Times Calculator: 8 hours. 09:15 to 17:45 = 8h 30m elapsed (8.5 h) · minus 30 break minutes = 8 net hours · rounded to 15-minute increment

Formula applied

The exact method behind this answer

CalculationTime keeps the method visible so the number can be checked instead of blindly trusted.

Start minutes = start hour × 60 + start minute. End minutes = end hour × 60 + end minute. Elapsed minutes = end minutes − start minutes; if negative, add 1,440. Net minutes = max(0, elapsed minutes − break minutes). Decimal hours = net minutes ÷ 60. Rounded hours = round(net minutes ÷ rounding increment) × rounding increment ÷ 60. Optional value = rounded hours × hourly rate.

Apply the formulaStart minutes = start hour × 60 + start minute. End minutes = end hour × 60 + end minute. Elapsed minutes = end minutes − start minutes; if negative, add 1,440. Net minutes = max(0, elapsed minutes − break minutes). Decimal hours = net minutes ÷ 60. Rounded hours = round(net minutes ÷ rounding increment) × rounding increment ÷ 60. Optional value = rounded hours × hourly rate.8 hours09:15 to 17:45 = 8h 30m elapsed (8.5 h) · minus 30 break minutes = 8 net hours · rounded to 15-minute increment

Your live breakdown

Current inputs in the calculation

These values come from the controls above and update when the calculator changes.

Start hour: 9 0–23
Start minute: 15 min
End hour: 17 0–23
End minute: 45 min
Unpaid break: 30 min
Rounding increment: 15 min
Optional hourly value: 0 per hour

Resulting answer

8 hours

09:15 to 17:45 = 8h 30m elapsed (8.5 h) · minus 30 break minutes = 8 net hours · rounded to 15-minute increment

Answer: 8 hours
Live support: 09:15 to 17:45 = 8h 30m elapsed (8.5 h) · minus 30 break minutes = 8 net hours · rounded to 15-minute increment

Assumptions used

What this answer assumes

Best for shifts, lessons, appointments, rentals, site visits, equipment logs, tutoring sessions and classroom duration worksheets where the clock times, break deduction and decimal-hour total need to stay visible.

Clock times use a 24-hour day; if the end time is earlier than the start time, the calculator treats the end as next day.
Break minutes are deducted after elapsed clock time is measured and cannot make the net result negative.
Rounding affects the displayed rounded-hour and optional value notes; exact elapsed minutes remain visible for checking.
This is duration arithmetic, not a timezone or daylight-saving calculator. Local clock changes, legal deadlines and payroll rules may need separate confirmation.
Optional hourly value is simple gross arithmetic before tax, deductions, overtime, penalty rates, minimum-wage rules, invoice terms or employer approval.

Master’s Tip

How to use the result well

Master’s Tip: print the start time, end time and break deduction together. A decimal-hour total without the original clock times is hard to audit for shifts, tutoring sessions, appointments or job-site records.

Printable record

What belongs in the saved calculation

Save the inputs, result, formula, assumptions, page URL and date together so the calculation can be reviewed later.

Start hour: 9 0–23
Start minute: 15 min
End hour: 17 0–23
End minute: 45 min

Embeddable calculator

Embed this calculator

Copy a clean iframe version with the required CalculationTime attribution link built in.

Formula

Start minutes = start hour × 60 + start minute. End minutes = end hour × 60 + end minute. Elapsed minutes = end minutes − start minutes; if negative, add 1,440. Net minutes = max(0, elapsed minutes − break minutes). Decimal hours = net minutes ÷ 60. Rounded hours = round(net minutes ÷ rounding increment) × rounding increment ÷ 60. Optional value = rounded hours × hourly rate.

Worked example

From 9:15 to 17:45, elapsed time is 8 hours 30 minutes, or 510 minutes. Subtract a 30-minute break to get 480 net minutes. Decimal hours = 480 ÷ 60 = 8.00 hours. With 15-minute rounding, the rounded total is still 8.00 hours.

Professional note

Regional and unit assumptions

Standard or basis: civil 24-hour clock duration arithmetic with 60 minutes per hour and 1,440 minutes per day. The calculator is a transparent time-record worksheet, not a jurisdiction-specific payroll or labour-law engine.

Assumptions and limitations

Clock times use a 24-hour day; if the end time is earlier than the start time, the calculator treats the end as next day.
Break minutes are deducted after elapsed clock time is measured and cannot make the net result negative.
Rounding affects the displayed rounded-hour and optional value notes; exact elapsed minutes remain visible for checking.
This is duration arithmetic, not a timezone or daylight-saving calculator. Local clock changes, legal deadlines and payroll rules may need separate confirmation.
Optional hourly value is simple gross arithmetic before tax, deductions, overtime, penalty rates, minimum-wage rules, invoice terms or employer approval.

Methodology & Accuracy

How this calculator is checked

CalculationTime pages are built around visible arithmetic: the formula, assumptions, worked example and practical limitations are shown so the result can be checked rather than simply trusted.

Formula used

Standard or basis

Where a calculator follows a named legal, trade or industry standard, that standard is cited visibly. Otherwise the page uses transparent general arithmetic and states its limits.

Master's Tip

Questions

How do I calculate hours between two times?

Convert both clock times to minutes after midnight, subtract start from end, add 1,440 minutes if the result is negative, then divide the net minutes by 60.

What if the end time is after midnight?

If the end clock time is earlier than the start time, this calculator treats the end as the next day. For example, 22:30 to 02:15 is 3 hours 45 minutes.

Can I subtract lunch or unpaid breaks?

Yes. Enter break minutes and the calculator subtracts them after measuring the elapsed clock span. The printed report keeps both elapsed and net time visible.

Is this the same as a payroll calculator?

No. It can prepare a time record, but it does not decide overtime, penalty rates, legal rounding, tax, awards, contracts or employer payroll rules.

What should I print for an hours-between-times record?

Print the start time, end time, overnight note if any, break minutes, exact net minutes, decimal hours, rounding increment, optional value, formula, assumptions, page URL, date and job or approval notes.

Calculation note

Hours-between-times arithmetic is simple when the clock span stays inside one day. The trust problem appears when the record crosses midnight, includes breaks or gets rounded for billing. Showing the minutes and assumptions prevents a clean-looking total from hiding the rule used to make it.

Clock time is not the same as elapsed duration

A start and end time are labels on a 24-hour clock. Duration appears only after the two labels are converted to minutes and compared, with special handling when the end label belongs to the next day.

Breaks should stay separate from elapsed time

For work, lessons and appointments, the raw clock span and the net counted time often differ. Keeping break minutes visible makes the record easier to check later.

Printable time records reduce disputes

A filed note with start time, end time, break deduction, rounding basis and notes is more useful than a bare decimal-hour number for payroll prep, invoices, rentals and classroom examples.

Sources and further readingNIST — SI Units: Time BIPM — The International System of Units U.S. Department of Labor — Hours Worked under the FLSA