Skip to content
Numio

Duration Calculator

Add or subtract durations in HH:MM:SS format, including values longer than 24 hours and negative results.

Mode

Input

Result

Type or paste on the left — the result updates as you type.

Minutes and seconds must be 00–59. This adds durations, not clock times or time zones; hours support up to 12 digits.

Up to 100,000 UTF-16 units per input and 1,000,000 per result. See the supported formats and examples below.

Format references

Tool page updated: