Burndown Chart Calculator

This calculator relies on fundamental Agile metrics to evaluate project health. First, your current velocity (sp_speed_cur) is calculated by dividing the total story points burnt (spBurnt) by the elapsed day count (dayCount). To determine what is needed to reach the sprint goal, it computes the remaining story points (sp_difference = total_sp - spBurnt) and divides that by the remaining days in the sprint (sprint_duration - dayCount). This yields the required speed (sp_speed_req). If your current speed meets or exceeds the required speed, your sprint is on track for successful delivery.

Imagine your team is managing a 14-day sprint with a total scope of 70 story points (total_sp = 70, sprint_duration = 14). Today is day 6 of the sprint (dayCount = 6), and your team has successfully burnt a total of 30 story points (spBurnt = 30). First, we calculate your current velocity: 30 story points divided by 6 days equals 5.0 story points per day. Next, we determine the remaining work: 70 total points minus 30 burnt points leaves 40 story points remaining. With 8 days left in the sprint (14 minus 6), the required speed to finish the sprint is 40 divided by 8, which equals 5.0 story points per day. Because your current speed matches your required speed, your sprint trajectory is perfectly balanced.

Update your story points daily to ensure accurate velocity tracking and early anomaly detection. Watch out for scope creep; if total story points increase mid-sprint, your required speed will spike instantly. Use the gap between current speed and required speed as an early warning system to negotiate backlog adjustments during daily standups before the sprint review.