Sankey Diagram Generator

A Sankey diagram is a flow visualization where the width of each arrow or band is proportional to the quantity it represents. Use them when you want to show how a total quantity (money, energy, users, votes) splits and moves through multiple stages or categories. They're especially effective for budgets, energy audits, user journey analysis, and supply chain flows.

Each line should follow the pattern: Source [Amount] Target — for example, Revenue [500] Operations. The source and target are node names (any text), and the amount must be a positive number inside square brackets. You can have multiple flows from the same source or into the same target; just add one per line.

Yes — intermediate nodes receive flow from upstream sources and pass flow to downstream targets. For example, 'Operations' might receive from 'Revenue' and then distribute to 'Salaries' and 'Infrastructure'. This is how multi-stage flows are modeled in Sankey diagrams.

Node alignment determines how nodes are positioned horizontally across the diagram. 'Justify' spreads nodes to fill the full width (most common), 'Left' pushes all nodes to the start, 'Right' pushes terminal nodes to the far right, and 'Center' groups nodes by depth in the middle of the canvas.

Any numeric unit works — dollars, euros, megawatts, gigabytes, users, votes, tonnes, and so on. Enter a unit label or currency symbol in the 'Value Unit' field and it will appear alongside amounts in the diagram. The calculation engine works with raw numbers, so just make sure all your flows use the same unit.

Start with your total revenue as the source node, then create flows to major cost categories (Operations, Marketing, R&D). From each category, add further flows to subcategories (Salaries, Infrastructure, etc.). The diagram will automatically show how the total budget is allocated across all levels, making it easy to spot where most spending goes.

Source nodes are nodes that only send flow outward — they have no incoming flows in your dataset. Terminal nodes only receive flow and do not pass it on. Intermediate nodes appear in both roles. The summary counts help you verify your data structure is correct before publishing your diagram.

Absolutely. Sankey diagrams are one of the standard tools in energy auditing and environmental reporting. Enter energy sources (Solar, Grid, Gas) as source nodes and end uses (Heating, Lighting, Cooling, Loss) as targets, using MW, kWh, or any energy unit. The width of each band will reflect the relative magnitude of each energy stream.