Choose the right mode
Add durations, compare two clock times, shift a clock time, or convert decimal hours.
FREE ONLINE TIME CALCULATOR
Time Calculator
Add or subtract durations, find the exact time between clock times, shift a clock time, or convert decimal hours — all without base-60 math in your head.
Runs in your browserNo sign-upSecond-level precision
DURATION MATH
Add or subtract time durations
Blank values count as zero. Minutes and seconds over 59 are normalized automatically.
ELAPSED TIME
Find time between two clock times
If the end time is earlier than the start time, the calculator treats it as the next day.
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CLOCK SHIFT
Add or subtract a duration from a clock time
TIMESHEET CONVERSION
Convert decimal hours and h:m:s
Useful for timesheets: 7.75 hours equals 7 hours 45 minutes, not 7 hours 75 minutes.
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HOW TO USE
How to Use Motricialy Time Calculator
Enter your time values
Use days, hours, minutes, and seconds. Large minute or second values are normalized automatically.
Use the normalized result
Read the duration in h:m:s, decimal hours, total minutes, or total seconds and copy what you need.
KEY FEATURES
Key Features of Motricialy Time Calculator
Add and subtract durations
Combine up to ten signed rows of days, hours, minutes, and seconds.
Overnight-aware time between
Calculate elapsed time across midnight without manually adding a day.
Clock time shifting
Move a starting clock time forward or backward and see the day offset clearly.
Decimal hours conversion
Convert timesheet-style decimal hours to hours, minutes, and seconds in either direction.
Multiple result formats
See normalized duration, decimal hours, total minutes, and total seconds together.
Browser-only processing
No account, no API call, and no time entries sent to a server.
TIME MATH GUIDE
Why time calculations feel harder than ordinary arithmetic
Clock and duration math uses groups of 60 rather than groups of 10. That is why 2 hours 45 minutes plus 1 hour 30 minutes becomes 4 hours 15 minutes, not 3 hours 75 minutes.
60 seconds1 minute
Seconds carry into minutes.
60 minutes1 hour
Minutes carry into hours.
24 hours1 day
Clock times wrap at midnight.
If you are preparing work logs or timesheets, you can move the result into Motricialy's Online Excel Editor or Online CSV Editor without installing desktop software.
FAQ
Time Calculator questions
How does the calculator add hours and minutes?
Each duration is converted to total seconds, the requested addition or subtraction is applied, and the result is normalized back into days, hours, minutes, and seconds.
What happens when the end time is earlier than the start time?
In Time Between mode, the calculator treats the end as occurring on the next day. For example, 10:30 PM to 6:15 AM is calculated as an overnight duration.
Can I use values greater than 59 minutes or seconds?
Yes. The duration modes normalize those values automatically, so 90 minutes becomes 1 hour 30 minutes.
What are decimal hours?
Decimal hours express fractions of an hour as decimals. For example, 7.75 hours equals 7 hours 45 minutes because 0.75 × 60 = 45.
Does this Time Calculator upload my entries?
No. The calculation logic runs locally in your browser, so your time values do not need to be uploaded.
Can I use the result in a spreadsheet?
Yes. Decimal hours are especially useful in timesheets, and you can continue working with them in Motricialy's Online Excel Editor.