Time Duration Calculator

Compute the duration between two times of day, even across midnight.

Time Duration Calculator

Compute the duration between two times of day, even across midnight.

Start time

End time

Break to deduct (minutes)

Enter values above and click Calculate — results will appear here with the formula explained.

minutes = (end − start); wrap through midnight if negative

How does this work?

Clock arithmetic isn't ordinary subtraction because hours wrap at 24. From 22:00 to 06:00 is not negative sixteen hours but eight — the overnight wrap is the single most common duration error.

Expressing results in decimal hours bridges to payroll and billing systems, where 7¾ hours must be entered as 7.75. Keep the minutes view for humans and decimals for spreadsheets.

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Quick Answer

Time Duration Calculator: Compute the duration between two times of day, even across midnight. Formula: minutes = (end − start). Example: 22:00 to 06:00 minus a 45-minute break: wraps to 480 minutes, less 45, giving 7 h 15 min — 7.

How to Use This Calculator

1Type both times in HH:MM, 24-hour format.
2Deduct any unpaid break minutes if relevant to get the accurate net work duration.
3Overnight intervals resolve automatically past midnight.

Formula Used

minutes = (end − start); wrap through midnight if negative

Clock arithmetic isn't ordinary subtraction because hours wrap at 24. From 22:00 to 06:00 is not negative sixteen hours but eight — the overnight wrap is the single most common duration error.

Expressing results in decimal hours bridges to payroll and billing systems, where 7¾ hours must be entered as 7.75. Keep the minutes view for humans and decimals for spreadsheets.

AdSense ready — add NEXT_PUBLIC_GOOGLE_ADSENSE_PUBLISHER_ID

728×90 — AdSense

Worked Example

22:00 to 06:00 minus a 45-minute break: wraps to 480 minutes, less 45, giving 7 h 15 min — 7.25 decimal hours.

AdSense ready — add NEXT_PUBLIC_GOOGLE_ADSENSE_PUBLISHER_ID

728×90 — AdSense

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Frequently Asked Questions

QHow do I enter PM times?

Use 24-hour notation: 2 pm is 14:00. It removes all AM/PM ambiguity.

QWhat about durations longer than a day?

For multi-day spans use the date difference calculator, then add leftover time-of-day minutes.

QWhy decimal hours?

Payroll and invoicing multiply rate × decimal time. 8¼ hours is 8.25, never 8.15.

Formula Used

minutes = (end − start); wrap through midnight if negative

Clock arithmetic isn't ordinary subtraction because hours wrap at 24. From 22:00 to 06:00 is not negative sixteen hours but eight — the overnight wrap is the single most common duration error.

Expressing results in decimal hours bridges to payroll and billing systems, where 7¾ hours must be entered as 7.75. Keep the minutes view for humans and decimals for spreadsheets.

Frequently Asked Questions

QHow do I enter PM times?

Use 24-hour notation: 2 pm is 14:00. It removes all AM/PM ambiguity.

QWhat about durations longer than a day?

For multi-day spans use the date difference calculator, then add leftover time-of-day minutes.

QWhy decimal hours?

Payroll and invoicing multiply rate × decimal time. 8¼ hours is 8.25, never 8.15.