Burndown Chart vs Burnup Chart
Verdict: A burndown chart shows remaining work trending downward toward zero as a sprint or project progresses — simple and widely used, but it hides scope changes. A burnup chart shows completed work trending upward, plotted against a separate line representing total scope — more complex to read, but it makes scope changes visible, which a burndown chart doesn't. Burnup charts are generally more informative when scope is likely to change; burndown charts are simpler and sufficient when scope is genuinely stable.
Quick facts
- A burndown chart plots one line: remaining work, decreasing toward zero.
- A burnup chart plots two lines: completed work (increasing) and total scope (which can also change over time).
- This connects to Project Management Triangle Explained, since scope changes are a core trade-off both chart types help visualize differently.
Side-by-side comparison
| Burndown Chart | Burnup Chart | |
|---|---|---|
| What it shows | Remaining work, trending toward zero | Completed work, trending toward total scope |
| Number of lines | One (remaining work) | Two (completed work and total scope) |
| Shows scope changes clearly? | No — a scope increase looks the same as slower progress | Yes — a scope line shift is visible directly on the chart |
| Simplicity | Simpler, more widely used and understood at a glance | Slightly more complex to read, but more informative |
| Best for | Stable-scope sprints where simplicity is valued | Projects or sprints where scope is more likely to change |
Why the difference matters
A burndown chart's core weakness is that it can't distinguish between two very different situations that look identical on the chart: the team working slower than expected, or scope being added mid-sprint. Both cause the remaining-work line to fall more slowly than planned, but they mean very different things for the team and stakeholders. A burnup chart solves this by showing total scope as its own separate, trackable line — if scope increases, you can see the total-scope line move up directly, distinguishing it clearly from a genuine slowdown in the team's completion rate.
How to read a burndown chart
The x-axis shows time (days within a sprint); the y-axis shows remaining work (in story points or hours). An ideal, straight diagonal reference line typically shows the "expected" pace; the actual line tracks real remaining work. If the actual line sits above the ideal line, the team is behind pace; if scope increases mid-sprint (new work added), the line can unexpectedly rise or flatten in a way that's easy to misread as pure slow progress.
How to read a burnup chart
The x-axis again shows time; the y-axis shows amount of work completed. Two lines are plotted: the total scope line (which stays flat if scope doesn't change, or steps upward if scope is added) and the completed work line (steadily rising as work finishes). The gap between the two lines at any point shows remaining work — and critically, if the total scope line itself moves, that change is immediately visible and distinguishable from the team's actual completion rate.
A worked example
A team starts a sprint with 40 story points of planned work. Partway through, a stakeholder adds an urgent item worth 8 points. On a burndown chart, remaining work briefly increases or plateaus in a way that looks like the team stalled — a viewer unfamiliar with the change might incorrectly conclude the team is behind. On a burnup chart, the total scope line visibly steps up from 40 to 48 points at the point the new item was added, while the completed work line continues rising steadily — making it immediately clear that the apparent "slowdown" was actually a scope increase, not reduced team performance.
Common mistakes with burndown and burnup charts
- Using a burndown chart for a project where scope changes frequently, making it hard to distinguish real delays from scope additions.
- Not explaining the chart's limitations to stakeholders, letting them draw incorrect conclusions from an ambiguous burndown pattern.
- Failing to update either chart consistently, undermining its usefulness as a real-time tracking tool.
- Assuming a flat or rising burndown line always means poor team performance, without checking whether scope changes are the actual cause.
FAQ
Which chart is easier to understand for stakeholders unfamiliar with agile metrics? Burndown charts are generally simpler and more intuitive at a glance, though this simplicity comes at the cost of hiding scope change information that a burnup chart makes visible.
Can a team use both charts? Yes — some teams use burndown charts for quick, simple sprint tracking and burnup charts for longer-term or higher-scope-volatility projects where distinguishing scope change from progress matters more.
Do these charts apply to Kanban as well as Scrum? Burndown and burnup charts are most commonly associated with Scrum's sprint-based structure, though similar concepts (like cumulative flow diagrams) serve an analogous purpose in Kanban.
How often should these charts be updated? Ideally daily, since their main value comes from providing real-time visibility into progress — infrequent updates significantly reduce their usefulness for spotting problems early.