Sankey Diagram — Create Flow Diagrams Online
Visualize flows, transfers, and proportions with an interactive Sankey diagram. Add nodes and links to see how quantities move between categories. All data stays in your browser — nothing leaves your device.
How to Use the Sankey Diagram Tool
- Add nodes — create the categories or stages you want to visualize flows between.
- Add links — select a source and target node, then set the flow value (weight).
- View the diagram — the Sankey diagram renders automatically showing proportional flow widths.
- Load a sample — click "Load Sample" to see a budget flow example instantly.
- Export — download the diagram as an SVG file for reports or presentations.
Why Use Sankey Diagrams
Sankey diagrams are uniquely effective at showing flows and transfers between stages or categories. The width of each link is proportional to the flow quantity, making it easy to spot where resources go, where they're lost, and how they redistribute.
They're invaluable for energy audits, budget analysis, user journey mapping, and any scenario where you need to visualize how a quantity moves through a system. Unlike bar charts or pie charts, Sankeys show direction and magnitude simultaneously.
Frequently Asked Questions
A Sankey diagram is a flow visualization where the width of arrows or links is proportional to the flow quantity. It shows how resources, energy, or data move between stages in a system.
You add nodes individually and then create links between them with numeric values. Each link represents a flow from one node to another, and the diagram scales the link width by the value.
Absolutely. Sankey diagrams are commonly used for energy audits, budget allocation, water flow analysis, and supply chain visualization. The proportional widths make imbalances immediately obvious.
Use Cases
Energy Flow Analysis
Visualize how energy moves through a building or industrial process, identifying losses and inefficiencies at each stage.
Budget Allocation
Track how money flows from income sources through various expense categories, revealing spending patterns at a glance.
User Journey Mapping
Map how users move through a website or app, showing drop-offs and conversions at each funnel stage.
Supply Chain Visualization
Illustrate how materials and components flow through a supply chain from raw materials to finished products.