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
Add work sessions or media segment lengths without treating a total above 24 hours as a clock time.
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.
Common questions
Does 01:30 mean ninety seconds?
No. Clock input 01:30 means one hour and thirty minutes. Use 00:01:30 for ninety seconds, or select numeric seconds. A leading minus subtracts an entry.
Why can a copied minute value be rejected when I enter it again?
Numeric input must represent a whole number of milliseconds. One second is a repeating decimal in minutes, so its displayed or copied approximation may fail that check. Reuse the exact clock result or the seconds value instead; these retain the tool’s millisecond precision.
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