Countdown Percentage Complete Calculator

See what percentage of a countdown has elapsed from the original duration and elapsed time.

How to use Countdown Percentage Complete Calculator

1. Enter Original Duration, Elapsed Time. 2. Plain numbers mean minutes; labelled d, h, min and sec are accepted. Durations are non-negative and a duration day means 24 hours. Static answers round to seconds, with nonzero subsecond values labelled. No holiday calendar or daylight-saving adjustment is applied. 3. Select Calculate or press Enter from a single-line field. In multiline text fields, Enter inserts a line break. 4. Select Copy result to copy the answer, or Reset to clear the form and result.

Why use this tool?

Use Countdown Percentage Complete Calculator when you need percentage complete. Plain numbers mean minutes; labelled d, h, min and sec are accepted. Durations are non-negative and a duration day means 24 hours. Static answers round to seconds, with nonzero subsecond values labelled. No holiday calendar or daylight-saving adjustment is applied.

How the calculation works

Completion = elapsed duration ÷ positive original duration × 100, capped at 100% with overtime labelled. Plain numbers mean minutes; labelled d, h, min and sec are accepted. Durations are non-negative and a duration day means 24 hours. Static answers round to seconds, with nonzero subsecond values labelled. No holiday calendar or daylight-saving adjustment is applied.

Example

Worked example: Original Duration = "10 min"; Elapsed Time = "3 min". Result: 30%.

Practical tip

Check the countdown percentage complete input and output convention before reusing the result.