100% local and secure
Your data stays on your device and is never sent to our servers.
Time Duration Calculator
Instantly find the number of hours and minutes between two times, including periods that cross midnight.
- 100% local
- Instant
- Free
- No account
- Works offline
Enter two valid times.
Calculated duration
Total minutes
Decimal hours
Why use this tool?
Calculate the exact duration between two clock times in hours and minutes, including intervals that cross midnight and end on the following day.
Smart processing
Generate, convert, or validate technical data with purpose-built controls.
Supported formats
Technical formats and syntaxes suited to each generator, converter, or validator.
Save time
Get a clean, ready-to-use result in seconds without installing software or configuring a complex workflow.
Fonctionnement
How does this tool work?
The engine converts both the start and end times into minutes elapsed since midnight. When the end time is earlier than the start time, it automatically adds 24 hours and interprets the end as occurring on the following day. The difference is then displayed as hours and minutes, total minutes and decimal hours. This simple rule handles ordinary daytime intervals and periods that cross midnight in a predictable way.
Use cases
Planning
Use this calculation to prepare a deadline or schedule with a value that can be checked immediately.
Verification
Check a result produced elsewhere and identify an input or method mistake more easily before using it.
Everyday use
Get an immediate answer for a common timing need without building a spreadsheet or repeating manual arithmetic.
Guide
How to use this tool
- 1
Enter the values
Provide the dates, times or durations requested by the tool.
- 2
Adjust the options
Choose the units or parameters that match your situation.
- 3
Review the result
The result recalculates automatically whenever an input changes.
Tips and best practices
- Check the entered values before using the result in a document, schedule or decision.
- The calculation runs locally in your browser and your data is not sent to a server.
- Reset the tool whenever you want to start a new scenario with clean inputs.
Frequently asked questions
Is the calculation automatic?
Yes. The result updates as soon as the required values are valid, without sending your data to a server.
Does my data stay local?
Yes. The entered information is processed directly in your browser by the shared Dates & time engine.
Can I change values after a calculation?
Yes. Change any input at any time and the result is immediately recalculated using the new values.
Was this tool useful?
Read next
GuideBest practicesBeginner
How to calculate work hours with a break
Calculate actual working time between a start and end time, subtract breaks and handle shifts that cross midnight.
8 September 20262 minRead
GuideBest practicesBeginner
Date and time calculations: a practical guide
Date differences, durations, business days, ISO weeks, recurrences and formats: choose the right date and time calculation.
7 September 20262 minRead
GuideConcepts and technologiesBeginner
Durations and time: calculate, convert and handle midnight crossings
Understand the difference between a clock time and a duration, calculate intervals between times, and convert seconds, minutes, hours, days and weeks.
28 August 20263 minRead
GuideBest practicesIntermediate
How to calculate business hours between two dates and times
Understand the difference between business days, business hours and working time, then calculate useful time inside opening hours.
8 September 20262 minRead
Recommended workflow
Continue your processing
Discover tools that naturally fit before, after, or alongside this one.
Complementary tools
Dates & time
Beta
Add or Subtract Time from a Date
Add or subtract days, weeks, months or years from a date.
100% localNew
Use this toolDates & time
Beta
Duration Converter
Convert seconds, minutes, hours, days and weeks.
100% localNew
Use this toolDates & time
Age calculator
Calculate an exact age from a date of birth and a reference date.
100% local
Use this tool