Here is a collection of definitions for Sankey diagrams:

“Sankey diagrams are a specific type of flow diagram, in which the width of the arrows is shown proportionally to the flow quantity. They are typically used to visualize energy or material transfers between processes.”
(source: Wikipedia, article ‘Sankey diagram)

“A Sankey diagram is a directional flow chart where the width of the streams is proportional to the quantity of flow, and where the flows can be combined, split and traced through a series of events or stages.”

“Sankey Diagrams are attention grabbing flowcharts that help in quick visualisation of the distribution and losses of material and energy in a process. The width of the lines used in drawing the flowchart is proportional to the quantum of material or energy.”

And some more in languages other than English:

“SANKEY, DIAGRAMA DE. SANKEY’S DIAGRAM. Representación gráfica del consumo de energía en un ecosistema natural o artificial, a manera de franjas que representan, según su anchura, la cantidad de energía correspondiente, según su dirección, al destino final de esa energía.”
(source: Fausto O. Sarmiento: Diccionario de Ecología)

“Un diagrama-Sankey es la representación gráfica de los caudales (cantidad por tiempo) de p.e. energía, material o dinero a través de un sistema. Normalmente los caudales son representados por flechas, en los cuales el ancho es proporcional al tamaño del caudal mostrado. Mejor que números o descripciones el diagrama le explica cuales caudales benefician y cuales constituyen residuos o emisiones.”
(source: STENUM Spanish webpage)

“Un diagrama de Sankey es un diagrama en que la anchuras de las flechas son proporcional a las cantidades de flujos. Sankey diagramas son una manera útil de visualizar los flujos de materiales, energía o costes.”
(source: duh? don’t remember where I took that from)

“Ширина стрел обозначает количество энергии. Вход энергии (топливо, электричество) обычно вливается в процесс слева, а полезный выход энергии (обогрев, освещение, механическая мощность, химическая энергия) и потери (тепло, шум и т.д.) показываются выходящими справа.”
(source: TACIS dissemination project webpage)

“Een Sankey-diagram is een diagram van het type stroomdiagram. Het wordt met name gebruikt in de procestechnologie en voor het weergeven van energiestromen. Typisch voor een dergelijk diagram is dat de breedte van de pijl, dat de energie- of materiaalstroom aangeeft, proportioneel is met de grootte van de stroming. Een Sankey-diagram is een prima middel om de energie- of materiaalstromen te visualiseren en daarmee het spaarpotentiaal te bepalen of de inefficiënte positie(s) in het proces vast te stellen.” (source: Wikipedia in Dutch)

“Le diagramme de Sankey (ou diagramme des flux d’énergie) représente, par des flèches de largeur correspondant à leur amplitude, les flux d’énergie traversant une frontière donnée.” (source: Morel/Gnansounou: Énergétique du Bâtiment, EPFL, p. 85)

“Il diagramma Sankey è uno specifico diagramma di flusso, nel quale viene mostrata la larghezza delle frecce in proporzione alla quantità di flusso. Generalmente sono utilizzati per visualizzare le quantità di energia o materiali o costi tra i processi.” (

Sankey Diagram in Japanese: サンキーダイアグラム

Sankey Diagram in Chinese: 桑基图 (see here)

Sankey Diagram in Arabic: مخطط سانكي

Sankey Diagram in Russian: диаграммы Сэнкей

34 Responses to “Sankey Definitions”

  1. Sankey Diagrams » Blog Archive » A hand-drawn goodie Says:

    […] another language for my collection of Sankey definitions… Posted by phineas April 9th, 2008 Filed in General Tags: school  […]

  2. Reinout Says:

    Dear phineas,

    I’m not sure you will even read this message, but I am searching for the next, it is a kind of sanky diagram, but not really:

    A Sanky is 1 arrow that is split by percentage. I am searching for a diagram generator that can handle the next:

    I have 4 buckets of apples. say 10-12-14 an 20 apples.
    Than some apples switch buckets.
    I would like to have a diagram where the buckets are represented by circles corresponding with the size (the 20 apples bucket 2x as big as the 10) and arrows between the buckets as thick as the corresponding amount of apples travelling from a to b. This will result in 4 circles and 12 arrows.

    I hope you get what I try to describe, and help me find a tool that can build such a graph out of excel tables.

    thanks a lot, Reinout

  3. Roy Douglas Says:

    Another definition of the Sankey Diagram:

    “A Sankey diagram is a graphic illustration of flows, like energy, material or money flows. Usually the flows are illustrated as arrows. The width of the arrows is proportional to the size of the represented flow. Sankey diagrams are a better way to illustrate which flows represent advantages and what flows are responsible for waste and emissions.”

  4. Balances Energéticos de Guatemala | InCyTDe Says:

    […] Se trata de los Diagramas de Flujo de Energía, que son una forma de diagramas del tipo “Sankey”. Estos diagramas presentan la información como un flujo que fluye desde las fuentes primarias […]

  5. Antonio Esposito Says:

    Please I have a mini split Sankey ES-12073D. I need user manual, is having tec. problems its displing error E3.

    I need error codes to figures out problem.


  6. SAS Global Forum : A new kind of path analysis : AnnMaria's Blog Says:

    […] A Sankey diagram, FYI, shows the direction and quantity of the flow along a path. There is a blog devoted to Sankey diagrams here. […]

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