A burndown chart shows the amount of work that remains over a defined period.
The horizontal axis shows time. Meanwhile, the vertical axis shows the remaining effort. Teams may measure this effort in hours, tasks, or story points.
The chart usually includes an actual progress line and an ideal progress line. Therefore, teams can compare current progress with the planned rate. If the actual line remains above the ideal line, the team may not finish all planned work on time. In contrast, a lower line indicates faster progress.
Teams often update the chart daily during a sprint. Moreover, changes in scope may cause the remaining effort to increase. As a result, the chart can reveal delays, unrealistic estimates, and added work.
However, the chart does not explain why progress changes. Teams must therefore combine it with backlog reviews and regular communication.
A burndown chart supports progress tracking, short-term forecasting, and transparent sprint planning.
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