Number base converter
Convert integers exactly between bases 2–36, including negative and very large values, with common base results shown together.
Add and subtract durations
Total time entries without wrapping at 24 hours, subtract durations and convert the result to seconds, minutes or hours.
One duration per line. HH:MM means hours and minutes; a minus sign subtracts time.
Updates as you type or change an option
Total time
About this tool
Total time entries without wrapping at 24 hours, subtract durations and convert the result to seconds, minutes or hours.
How to use
Enter one duration per line. In clock format, 01:30 means one hour and thirty minutes; 00:01:30 means ninety seconds. Prefix an entry with − to subtract it. Alternatively choose numeric seconds, minutes or hours.
Totals retain milliseconds and do not wrap at midnight. Numeric input supports the local decimal separator but must resolve to whole milliseconds. Copy the formatted total or individual conversions. Limits: 10,000 entries, 256 KiB input and an absolute total of 10^18 milliseconds.
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