Release Calculator
For background, see the original post. Use whatever estimation units you prefer – days, story points etc.
| Historical velocities (optional) | |||
|---|---|---|---|
| Historical Velocities | hv | (velocities achieved in recent iterations, comma-separated) | |
| Inputs | |||
| Planned release backlog | pb | (estimation units) | |
| Velocity | v | (estimation units achieved on average per iteration) | |
| Velocity variation (%) | vv | (standard deviation of velocity as percentage of velocity) | |
| Creep | rc | (estimation units added to backlog per iteration) | |
| Calculated | |||
| Effective velocity |
ev | v – rc | |
| Expected iterations (50% confidence) |
ni | pb / ve | |
| Iteration length variation | lv | (1/(1 – vv) – 1) * 100% | |
| Contingency (2 s.d.) |
c | 2 * sqrt(ni) * lv | |
| ri | ni + c | ||
The v and vv fields will be calculated from the historical velocities hv if these are provided.
Example: pb = 100 (story points), v = 20 (story points per iteration), rc = 2 (story points per iteration), vv = 20 (percent) gives ni = 5.6 and ri = 6.7. You should plan for up to 7 iterations, not the 5 the basic velocity calculation would give you.
2 thoughts on “Release Calculator”
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Enjoyed using your calculator. I will try again with real number and comeback to with feedback.