Average your recent sprints into a velocity, then see how many sprints the remaining backlog takes at your best, likely and worst pace.
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Velocity = average points completed across recent sprints. Sprints remaining = points remaining / velocity. The best and worst cases divide by your fastest and slowest observed sprints, which is the honest range given how few data points three sprints is.
Three to six. Fewer and one unusual sprint dominates; more and you are averaging over a team that has since changed shape. If the spread between your fastest and slowest is wide, the range matters more than the average.
No. Points are calibrated inside one team, so a 5 on one team is not a 5 on another. Comparing velocities across teams reliably produces point inflation rather than more work.
Only as a range, and only if the backlog is stable. A single-number forecast from three sprints implies precision that is not there, which is why the worst case is the number worth committing to.
The same numbers, live off the rows your team already edits, in a spreadsheet that rolls them up for you. Start your 7-day free trial, no credit card required.