A burndown chart is one of the most recognizable tools in agile project management. It shows how much work remains versus how much time is left, and it tells you at a glance whether a sprint is on track.
Track sprint progress, compare actual work remaining with your ideal burndown, and estimate whether your team is on schedule to finish on time.
Project Settings
Enter the number of working days completed, from 0 through the sprint duration.
Use the same unit as total planned work.
Optional new scope added during the sprint.
Daily Completed Work (Optional)
Enter the amount of work completed on each elapsed day. These are daily completion amounts, not remaining work. Leave blank to use the total completed-work value above. If supplied, the sum must match the total completed work according to your selected scope option.
Burndown Chart
Daily Burndown Data
| Day | Ideal remaining | Actual remaining | Actual completed to date |
|---|
Step-by-Step Calculation
The ideal line assumes work decreases evenly from the initial scope to zero by the final sprint day. Actual progress uses the work completed and scope entered above. Future actual values are estimates based on average completion to date; they are not guaranteed outcomes.
The burndown chart calculator builds that chart from your sprint data and computes the key metrics.
This guide covers what a burndown chart is, the ideal vs actual lines, how to use a burndown chart calculator step by step, velocity and scope changes, common mistakes, and practical applications. For related business and finance tools, you may also find our doubling time calculator and average percentage calculator useful.
What Is a Burndown Chart?
A burndown chart is a line graph that plots work remaining (on the vertical axis) against time (on the horizontal axis).
At the start of a sprint, the total work is known. Each day, completed work is subtracted. The chart shows how quickly the team is burning through the backlog.
Why It Matters
The burndown chart makes progress visible. It reveals whether the team will finish on time, and it flags problems early enough to react.
The Two Lines
| Line | Meaning | Shape |
|---|---|---|
| Ideal | Perfect linear progress | Straight diagonal |
| Actual | Real progress | Jagged, stepped |
Burndown Chart Calculator: What It Computes
A burndown chart calculator handles several tasks:
- Ideal burndown — the straight line from total work to zero
- Actual burndown — the real progress line
- Daily remaining work — after each day’s completions
- Velocity — average work completed per day
- Projected completion — when the team will finish at current pace
- Scope change detection — when work is added or removed
Input Options
Most calculators accept:
- Total story points — the sprint backlog
- Sprint length — days or weeks
- Daily completed points — progress data
- Scope changes — work added or removed mid-sprint
Output Format
Quality calculators display:
- The ideal line
- The actual line
- Daily remaining values
- Velocity and projected finish
Quick Reference: Inputs and Outputs
| Input | Example |
|---|---|
| Total points | 100 |
| Sprint length | 10 days |
| Ideal daily burn | 10 points/day |
| Actual day 1 | 12 done |
| Remaining day 1 | 88 |
The Formulas Behind the Burndown Chart Calculator
Ideal Burndown
Ideal Remaining (Day d) = Total Points − (Total Points / Sprint Days) × d
This gives a straight line from total points to zero.
Actual Burndown
Actual Remaining (Day d) = Total Points − Cumulative Points Completed
If scope changes, add or subtract the change from the total.
Velocity
Velocity = Total Points Completed / Days Elapsed
Projected Completion
Projected Days = Remaining Points / Velocity
Scope Change
New Total = Original Total + Points Added − Points Removed
Formula Reference Table
| Metric | Formula |
|---|---|
| Ideal remaining | Total − (Total/Days) × d |
| Actual remaining | Total − Cumulative done |
| Velocity | Done / Days |
| Projected finish | Remaining / Velocity |
| New total | Original ± Scope change |
Step-by-Step: Using a Burndown Chart Calculator
Step 1: Enter the Total Story Points
This is the sprint backlog estimate.
Step 2: Enter the Sprint Length
Days or weeks. The calculator computes the ideal daily burn.
Step 3: Enter Daily Progress
Each day, record the points completed.
Step 4: Note Scope Changes
If work is added or removed, enter the change.
Step 5: Read the Chart
The calculator plots the ideal and actual lines.
Step 6: Interpret the Result
If the actual line is above the ideal, the team is behind. If below, ahead.
Burndown Chart Calculator: Special Cases
Ahead of Schedule
The actual line is below the ideal. The team will finish early.
Behind Schedule
The actual line is above the ideal. The team may not finish.
Flat Line
No work completed for a day. Common at sprint start or during blockers.
Scope Creep
Work added mid-sprint. The total line jumps up.
Scope Reduction
Work removed. The total line drops.
Summary Table
| Pattern | Meaning | Action |
|---|---|---|
| Below ideal | Ahead | Maintain pace |
| Above ideal | Behind | Investigate blockers |
| Flat | No progress | Identify impediment |
| Jump up | Scope added | Re-estimate |
| Drop down | Scope removed | Re-baseline |
Ideal vs Actual Burndown
The Ideal Line
The ideal line assumes constant progress. It is a planning tool, not a prediction.
The Actual Line
The actual line reflects reality. It is jagged because work does not complete evenly.
Why the Gap Matters
The gap between ideal and actual tells you how much risk remains.
Interpretation Table
| Gap | Interpretation |
|---|---|
| Actual below ideal | Ahead of schedule |
| Actual on ideal | On track |
| Actual above ideal | Behind schedule |
| Actual flat then drops | Batch completion |
| Actual jumps up | Scope added |
Velocity and Projected Completion
Velocity
Velocity is the average points completed per day (or per sprint). It is the team’s throughput.
Using Velocity to Project
If velocity is 8 points/day and 40 points remain, the team needs 5 more days.
Why Velocity Matters
Velocity stabilizes over time and becomes a reliable planning input.
Velocity Table
| Day | Points Done | Cumulative | Velocity |
|---|---|---|---|
| 1 | 12 | 12 | 12 |
| 2 | 8 | 20 | 10 |
| 3 | 10 | 30 | 10 |
| 4 | 6 | 36 | 9 |
| 5 | 14 | 50 | 10 |
Practical Applications
Sprint Planning
The burndown chart shows whether the sprint scope is realistic.
Daily Standups
The chart gives the team a shared view of progress.
Stakeholder Communication
The chart communicates status without jargon.
Release Planning
Multiple sprints chain together into a release burndown.
Process Improvement
Patterns in the chart reveal systemic issues.
Common Mistakes and How to Avoid Them
Mistake 1: Ignoring Scope Changes
If work is added, the total must change.
Solution: Update the total whenever scope changes.
Mistake 2: Confusing Burndown with Burnup
Burndown shows work remaining. Burnup shows work completed.
Solution: Pick one and use it consistently.
Mistake 3: Overreacting to One Day
Daily noise is normal.
Solution: Look at the trend, not a single point.
Mistake 4: Not Updating Daily
Stale data makes the chart useless.
Solution: Update at the same time each day.
Mistake 5: Using Hours Instead of Points
Hours are volatile. Points are stable.
Solution: Use story points for the burndown.
Burndown Chart Calculator with Steps: What to Expect
Quality step-by-step tools show:
- The total points and sprint length
- The ideal line calculation
- Daily actual progress
- Remaining work per day
- Velocity
- Projected completion
Related Calculators on Our Site
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- Time Percentage Calculator — for time-based percentage calculations
- Percent to Goal Calculator — for tracking progress toward targets
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- Bessel Function Calculator — for advanced engineering applications
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- Free Online Calculator Tools — for a full suite of math tools
Frequently Asked Questions
1. What is a burndown chart calculator?
It builds a burndown chart from sprint data, showing work remaining versus time.
2. What is the ideal burndown line?
A straight line from total work to zero over the sprint length.
3. What is the actual burndown line?
The real progress line, based on daily completed work.
4. What is velocity?
The average work completed per day or per sprint.
5. How do I calculate the ideal daily burn?
Total points divided by sprint days.
6. What if the actual line is above the ideal?
The team is behind schedule.
7. What if the actual line is below the ideal?
The team is ahead of schedule.
8. What is scope creep?
Work added mid-sprint, causing the total to rise.
9. What is the difference between burndown and burnup?
Burndown shows work remaining. Burnup shows work completed.
10. Should I use hours or story points?
Story points are more stable for burndown charts.
11. How often should I update the chart?
Daily, at the same time.
12. What does a flat line mean?
No work completed, often due to blockers.
13. Can the burndown chart predict completion?
Yes, using velocity to project the remaining work.
14. How accurate is the burndown chart?
It is a planning tool, not a guarantee. Accuracy improves with consistent data.
15. What tools can I use besides an online calculator?
Spreadsheets, Jira, Trello, and other agile tools generate burndown charts.
Call to Action
Ready to track your sprint with clarity? Try our free Burndown Chart Calculator to plot the ideal and actual lines, compute velocity, and project completion. Whether you are a scrum master or a product owner, our tool makes sprint progress visible.
Launch the Burndown Chart Calculator →
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