Multi-Countdown Duration Planner

Add several countdown durations together to find their combined running time.

How to use Multi-Countdown Duration Planner

1. Enter Timer Durations. 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. Separate durations with commas, semicolons or new lines. This page totals a plan; it does not run multiple alarms. 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 Multi-Countdown Duration Planner when you need combined countdown time. 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. Separate durations with commas, semicolons or new lines. This page totals a plan; it does not run multiple alarms.

How the calculation works

Planned duration = sum of entered durations. 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. Separate durations with commas, semicolons or new lines. This page totals a plan; it does not run multiple alarms.

Example

Worked example: Timer Durations = "1 min, 30 sec, 90 sec". Result: 3 min.

Practical tip

Check the multi-countdown duration planner input and output convention before reusing the result.