TL;DR: Most waterfall diagram tutorials end at "insert chart." This one covers the full Excel build, explains what the diagram actually communicates in project planning, and identifies the specific point where a static spreadsheet stops serving IT teams that need live dependency tracking and task ownership.
What a waterfall diagram actually shows
A waterfall diagram in project management is a sequential phase chart where each bar represents a distinct stage (Discovery, Design, Build, Test, Deploy) and the next bar starts only when the previous one ends. The visual reads left to right, showing cumulative progress and hard dependencies between phases.
This is not the same thing as a financial waterfall chart. The financial version shows how an opening value increases or decreases through contributing factors (revenue gains, cost deductions) to arrive at a closing value. If you need that, see how to build a waterfall chart in Excel for budget tracking and variance analysis. Different purpose, different data structure.
For a waterfall diagram in project management, what matters is:
Phase sequence. Each block depends on the one before it. No overlap by design.
Cumulative duration. The total project timeline is the sum of all phases, making scope creep in any single phase immediately visible.
Gate clarity. The boundary between bars is a decision point: does this phase pass review before the next begins?
This structure works best when your project genuinely flows in one direction. Before building anything in Excel, you need a work breakdown structure that splits the project into phases. Without that, the diagram has nothing accurate to show.
How a waterfall diagram differs from a Gantt chart
A Gantt chart plots tasks as horizontal bars against a calendar. Each bar shows start date, end date, and duration. Bars can overlap, which makes Gantt charts useful when multiple workstreams run in parallel.
A waterfall diagram in project management does something different. It shows phases stacked in strict sequence, where each phase's starting point depends on the previous phase's completion. The visual emphasis is on cumulative progress and phase-to-phase dependency, not on calendar overlap.
Waterfall diagram | Gantt chart | |
|---|---|---|
Primary axis | Cumulative progress or effort | Calendar timeline |
Overlap allowed | No (sequential by design) | Yes (parallel tasks) |
Best for | Phase-gate projects, approval-driven workflows | Multi-resource scheduling |
Visual structure | Stacked sequential blocks | Horizontal duration bars |
Pick the waterfall vs Gantt chart decision based on your project's structure. If your IT project moves through defined gates (requirements, design, build, test, deploy) and no phase starts until the prior one closes, a waterfall diagram communicates that constraint clearly. If tasks overlap or resources shift between workstreams, a Gantt chart fits better.
Many teams need both. You might use a Gantt for daily scheduling and a waterfall diagram for executive reporting on phase completion. Before building either, consider breaking the project into phases so your data is clean from the start.
How to create a waterfall diagram in Excel, step by step
You can build a waterfall diagram in Excel two ways: using the native chart type (available in Excel 2016, Excel 2019, Excel 2021, and Microsoft 365) or manually stacking bars in older versions. The native option is faster but designed primarily for financial data (revenue bridges, budget variances). For project phase visualization, you will likely need the manual method regardless of your Excel version, because the native waterfall chart type does not support sequential phase blocks with dependency logic. It renders individual value increases and decreases, not duration-based stages.
Manual method (works in all Excel versions):
Set up your data table with four columns: Phase Name, Invisible Base, Phase Duration, and Cumulative End. The Invisible Base for each row equals the Cumulative End of the previous row. For example, if "Requirements" runs from week 0 to week 3, its Invisible Base is 0 and Duration is 3. "Design" starts at week 3, so its Invisible Base is 3 and Duration is 2.
Select all four columns and insert a Stacked Bar Chart (Insert > Bar Chart > Stacked Bar). Excel will render two color blocks per row: the invisible base and the visible phase duration stacked on top.
Click the Invisible Base series, right-click, choose Format Data Series, and set Fill to "No Fill" and Border to "No Border." This makes the base disappear, leaving only your phase blocks floating at the correct position along the horizontal axis.
Format the visible phase blocks with distinct colors per phase. Keep contrast high. Add data labels showing the phase name and duration (right-click series > Add Data Labels > format to show Category Name and Value).
Set the horizontal axis to represent your project timeline in weeks or days. Remove gridlines if they clutter the view. Add a chart title that names the project and date range.
Native waterfall chart (Excel 2016+):
If your phases are purely sequential and you want a quick visual, select your Phase Name and Duration columns, then go to Insert > Waterfall Chart. Excel will treat each value as an increment. Set the final bar as a "Total" by right-clicking it and selecting "Set as Total." This approach works for showing cumulative project length but does not encode dependencies or parallel work.
The manual method takes 10 to 15 minutes the first time and produces a reusable template. For a deeper walkthrough of the financial waterfall variant, see how to create a waterfall chart in Excel. The project-phase version described above adapts the same stacked-bar logic but reframes the axis as a timeline rather than a dollar figure.
One limitation worth knowing upfront: neither method auto-updates when phases shift. Every scope change means manually recalculating your Invisible Base column. That matters for the next section, where we cover when this approach stops being worth the effort.
Advantages and disadvantages of using a waterfall diagram
A waterfall diagram works well in project management when the scope is locked, phases run sequentially, and stakeholders need a single visual showing how work flows from initiation to delivery. For fixed-bid IT projects with contractual phase gates, it communicates timeline and dependency at a glance.
Where it earns its place:
Makes sequential dependencies obvious, so teams know what must finish before the next phase starts
Forces you to complete breaking the project into phases before you diagram it, which sharpens scope definition upfront
Gives executives a clean, linear read of project progress without needing context on daily task movement
Where it falls apart:
Parallel workstreams disappear. If your dev and QA teams overlap, the diagram lies by implication
Scope changes require a full rebuild. In Excel, that means re-stacking invisible base bars from scratch
It conflates time spent with progress made. A long bar might mean complexity or might mean the team was blocked for three weeks
The waterfall diagram advantages and disadvantages split cleanly along one line: predictability of scope. If your project has fewer than two expected change orders and a defined end state, a waterfall diagram in project management is the right visual. If scope shifts monthly, you will spend more time rebuilding the chart than reading it.
For financial variance work, a waterfall chart in Excel for budget tracking and variance analysis is a better fit than forcing project phases into the same format.
Can you use a waterfall diagram for agile project management
Short answer: poorly, but not uselessly.
A waterfall diagram assumes sequential, non-overlapping phases. Phase B starts only after Phase A finishes. That maps cleanly to fixed-scope projects with hard gates, but it contradicts how agile teams actually work. Sprints overlap, scope shifts mid-cycle, and priorities re-rank every two weeks. Trying to force iterative delivery into a sequential bar chart creates a diagram that's outdated before the ink dries.
Where a waterfall diagram can still earn its place in agile project management: as a high-level release roadmap. If your team ships quarterly releases with defined feature sets, a waterfall diagram communicates the intended sequence of major milestones to stakeholders who think in phases, not sprints. The key distinction is treating it as a communication artifact showing intent, not a live execution plan tracking iteration.
The moment you start updating it sprint-by-sprint, you've built yourself a maintenance burden that fights the methodology.
For teams running agile but reporting to leadership that expects phase-based visuals, a better approach is pairing the roadmap-level waterfall diagram with actual workflow examples for project management that reflect how work moves day to day. The diagram stays static and strategic. The workflow stays dynamic and operational.
Where Excel waterfall diagrams hit their limit for IT teams
Excel's native waterfall chart type (available since Excel 2016) was designed for financial variance analysis, not project phase tracking. When IT teams repurpose it as a waterfall diagram in Excel for project management, every sprint close, scope change, or budget reallocation means manually rebuilding the chart. The data series doesn't link to live task status. You're copying, pasting, and reformatting a static picture of last week's plan.
For a five-phase project with biweekly sprints, that's roughly 10 manual rebuilds per quarter, each taking 20 to 40 minutes if your categories stay clean. They rarely do.
The deeper problem: the diagram lives in a file, disconnected from the work it represents. By the time you share it, it's already stale.
Taro solves this by letting you build diagrams embedded directly inside tasks. When a phase shifts or a dependency changes, the waterfall diagram project management view updates with the task data. No separate rebuild cycle, no version-control headaches across Slack threads.
If your current workflow still starts with breaking the project into phases before you diagram it, Taro keeps that structure live rather than frozen in a spreadsheet.
Closing
A waterfall diagram in Excel works only when your project truly flows in one direction—phases locked, scope stable, dependencies clear. The moment scope shifts or teams overlap, you're rebuilding invisible base columns instead of tracking actual progress. If your IT projects already move faster than your Excel rebuild cycle, there's a better way: embed your diagram inside Taro's whiteboard, where phases update as work moves and dependencies live alongside task ownership—no separate file to maintain.
FAQ
Q. How do I create a waterfall diagram in Excel?
A. Use the manual stacked-bar method: create columns for Phase Name, Invisible Base, Phase Duration, and Cumulative End. Insert a Stacked Bar Chart, hide the Invisible Base series by removing its fill and border, then format phase blocks with distinct colors and data labels. Takes 10–15 minutes and works in all Excel versions.Q. What is a waterfall diagram used for in project management?
A. It visualizes sequential project phases where each stage depends on the previous one completing. The diagram shows cumulative timeline, phase-to-phase gates, and scope impact—useful for fixed-bid IT projects with contractual approval points.Q. How does a waterfall diagram differ from a Gantt chart?
A. Waterfall diagrams show phases in strict sequence with no overlap; Gantt charts plot tasks on a calendar and allow parallel work. Use waterfall for phase-gate workflows; use Gantt for multi-resource scheduling.Q. What are the advantages and disadvantages of using a waterfall diagram?
A. Advantages: makes dependencies obvious, forces upfront scope definition, gives executives a clean progress read. Disadvantages: hides parallel workstreams, requires full rebuild on scope changes, conflates time spent with progress made.Q. Can I use a waterfall diagram for agile project management?
A. No. Waterfall diagrams assume locked scope and sequential phases; agile thrives on iterative cycles and scope flexibility. A Gantt chart or burndown chart fits agile workflows better.Q. What data do I need before building a waterfall diagram in Excel?
A. A completed work breakdown structure that splits your project into sequential phases, each with a defined duration in weeks or days. Without that, the diagram has no accurate data to show.
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Ryan Mitchell is a Productivity Specialist & Operations Consultant who helps fast-growing teams stop dropping balls and start moving with clarity. With experience scaling ops at startups across three continents, he writes about task systems, team accountability, and how the best businesses build workflows that actually stick.