Story points vs days with Sprint Poker
This page opens on Calibration, the Sprint Poker Pro view ($29 once) that lines up the story points you voted with how long each issue really took. Preview it free with the built-in sample sprints to see the chart straight away. The estimating itself is free: close the view to start a Fibonacci room with keyed stories, so your estimates are ready to match once you have Pro.
- Click "Preview with sample sprints" to see the result first, free: three sprints of estimates plotted against cycle time, the range per card value and the stories that took longest per point.
- Close Calibration and start a free room. It has five stories with keys (APP-501 and so on); replace them with your issues, keeping a key in front of each title so they can be matched later.
- Estimate as usual. Each final value is saved with its key in this browser's session history as soon as you set it.
- After the sprint, export the same issues from your tracker with a cycle time column, or start and done dates (for example Created and Resolved in Jira).
- With Pro, drop that CSV into Calibration, check the columns it picked, and import: each issue's final estimate is plotted against the days it really took. Without Pro, dropping the file opens the upgrade.
What to know
There is no universal conversion from story points to days. Points are relative to a team's own reference stories, so one team's 3 can take two days and another team's a week. The only honest conversion is your own history: for each card value, how long did those stories actually take? That is what Calibration computes from two things you already have, your estimates and your tracker's export.
Expect a range rather than a number. Even in a well-calibrated team, stories estimated at 3 often take anywhere from one day to two weeks, because waiting for review, blocked dependencies and interruptions are not in the estimate. A useful reading is "most of our 3s take two to five days", and the outliers listed under "took longest per point" are the stories worth discussing in the retrospective.
The import accepts a cycle time column in days (also "3d", "36h" or "1w"), or a start and an end date from which the days are computed; Jira dates like 12/Mar/26 4:15 PM are understood. Keys are matched case-insensitively, and numeric IDs become #123 to match GitHub or Azure DevOps items. Only the per-issue numbers are stored, in this browser, and in your team space if you use one.
What is free and what is Pro: running the estimation and keeping keyed estimates in your browser is free, and the sample preview shows every Calibration chart on made-up sprints. Matching your own actuals is Pro, for every sprint including the latest one: the estimate-versus-cycle-time chart, the range per card value such as "your 5s take 3 to 9 days", and the sprint-over-sprint trend of days per point.
Updated · Cosmovex
Questions
How many days is one story point?
It depends on the team: points are relative to your own reference stories. Calibration answers it with your data by plotting each estimated story against the cycle time it really had.
Is Calibration free?
No. Calibration on your own data is part of Sprint Poker Pro, $29 once, and that includes your latest sprint. The free plan lets you preview it with built-in sample sprints and keeps your keyed estimates ready in this browser.
What file does Calibration need?
A CSV with an issue key column and either a cycle time, a start and a done date, or actual story points. A Jira export with Issue key, Created and Resolved works; so does a two-column file of key and days.
Why do my keys not match?
Calibration matches the keys of stories you estimated in Sprint Poker in this browser. Stories added without a key, such as a plain title, cannot be matched, so keep keys in front of titles when you add the backlog.
Is my tracker data uploaded?
No. The CSV is read in your browser and only the key with its days or points is kept, in this browser. With a Pro team space, those numbers are also saved to the team.
The free plan covers everything on this page. Sprint Poker Pro ($29, paid once) is described on the Sprint Poker page.
