Meeting End Estimator
Add agenda item lengths and the buffer between items to get a meeting's end time in any time zone, with each item's start and end and clock changes counted. How it works
Use the Meeting End Estimator
About the Meeting End Estimator
End time = start + the sum of the item lengths + buffer × (items − 1): three 30-minute items with a 5-minute buffer from 9:00 end at 10:40, 1 hr 40 min later. The Meeting End Estimator lists when each item starts and ends in the time zone you choose and counts real minutes across a daylight saving change. Fill in Must finish by and it works backward: the same agenda that has to end at 10:00 must start by 8:20 AM.
Meeting length with 30-minute items
| Items | No buffer | 5 min buffer | 10 min buffer |
|---|---|---|---|
| 3 | 1 hr 30 min | 1 hr 40 min | 1 hr 50 min |
| 4 | 2 hr | 2 hr 15 min | 2 hr 30 min |
| 5 | 2 hr 30 min | 2 hr 50 min | 3 hr 10 min |
Add the length to the start: from 9:00, 3 items with a 5-minute buffer end at 10:40.
Clock changes in New York: three 30-minute items, 5-minute buffer
| Date and start typed | Starts | Ends | What happens |
|---|---|---|---|
| 2026-07-15, 09:00 | 9:00 AM EDT | 10:40 AM EDT | No clock change. |
| 2026-03-08, 02:30 | 3:30 AM EDT | 5:10 AM EDT | 02:30 does not exist that day, so the start moves forward by the gap. |
| 2026-03-08, 01:00 | 1:00 AM EST | 3:40 AM EDT | The clocks go forward during item 2, which runs 1:35 AM EST to 3:05 AM EDT. |
| 2026-11-01, 01:30 | 1:30 AM EDT | 2:10 AM EST | 01:30 happens twice; the earlier one is used, and item 1 ends at 1:00 AM EST. |
Each meeting is 100 real minutes. When the clocks change during a meeting, every time in the table names its zone.
Frequently asked questions
- Is the buffer added after the last agenda item?
- No. The buffer is the change-over between two items, so 3 items have 2 buffers: three 30-minute items with 5 minutes between them take 1 hr 40 min, not 1 hr 45 min.
- What if the meeting starts in the hour the clocks skip?
- The start moves forward by the gap, the compatible rule that the JavaScript Temporal API also uses. In New York on March 8, 2026, a 02:30 start becomes 3:30 AM EDT, and three 30-minute items with 5-minute buffers end at 5:10 AM EDT; the page says the typed time does not exist.
- What if the start time happens twice when the clocks go back?
- The earlier one, before the clocks go back, is used. In New York on November 1, 2026, 01:30 is 1:30 AM EDT; the first 30-minute item ends at 1:00 AM EST, and every time in the table names its zone.
- How long is a meeting with 4 agenda items and 10-minute breaks?
- With 30-minute items, 2 hr 30 min: 4 × 30 + 3 × 10 = 150 minutes, so a 9:00 start ends at 11:30.
- What does Running over a 1-hour slot mean?
- The total is compared with 60 minutes. Three 30-minute items with 5-minute buffers run 40 minutes over, and the page suggests cutting 14 minutes (40 ÷ 3, rounded up) from each item or splitting the meeting. For a slot of any other length, fill in Must finish by with the end of the slot: the page gives the latest start and says how far your start time finishes before or after it.
- Can I share an agenda?
- Yes. Share link copies a link with the start time, date, time zone, finish-by time and item lengths, such as ?start=09:00&date=2026-07-15&tz=America/New_York&buffer=5&items=30,30,30 (minutes, up to 20 items); the descriptions stay out of it. Copy agenda copies the plan as plain text, one line per item with its start, end, length and elapsed time. The tool saves nothing.
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