Tools › Kalshi deadline calculator
Worked example from September 25, 2026; the calculator counts days from today · runs in your browser
A deadline ladder prices each date's Yes separately, and a later deadline includes the earlier ones. With 20¢ for before October 31 and 35¢ for before December 31, the market gives 18.8% for the second period if nothing has happened by the first date: (35 - 20) / (100 - 20). That is about 17.2% a month in the first period and 9.8% a month in the second; a falling monthly chance is how a ladder prices a slowing event.
| Deadline | Days in period | Yes price | Chance in this period, if not before | Per month |
|---|
| Deadline | Days in period | Yes price | Chance in this period, if not before | Per month |
|---|---|---|---|---|
| October 31, 2026 | 36 | 20.0% | 20.0% | 17.2% |
| December 31, 2026 | 61 | 35.0% | 18.8% | 9.8% |
Per month: the constant monthly chance that compounds to the period's chance over its days (30.44-day months).
Related: expiration · close time · odds converter · live Kalshi odds · all tools
Each date in the ladder is its own Yes/No market that pays $1 if the event happens before that date under the rules. A later date covers the earlier ones, so its price should be at least as high.
Take the gap between two deadlines and divide it by what was left after the earlier one: (later - earlier) / (1 - earlier). 20¢ and 35¢ give (35 - 20) / 80 = 18.75%.
Then the ladder contradicts itself: the later market includes the earlier one and should cost at least as much. Check the rules for different wording, then the order books; the calculator flags the case.
No. It reads the market's chances; for trading costs use the fee calculator.