# Gravity history First off: different people use different units. You can set all units used in this graph in your interface settings . This includes the unit for the gravity itself °Plato, SG (as as the temperature in °C or °F for the neighbouring graphs). By default, the graph will display two lines: The gravity (in the unit of your choice) and the fermentation percentage: ![](/files/rF6uCezIRYR1P69qEeho) ![](/files/vk4uK7KcyHTTeC5rcftH) While the gravity is straight-forward (well, that's the reading from your Brick) the "% Fermentation" needs a little bit more explanation. "% Fermentation" is calculated like follows: Suppose you started fermentation with a green beer at SG=1.05 or 12°Plato and are now at SG=1.025 or 6°P. The "fermentation percentage" would be 50% as 50% of the available sugars were already fermented. If you set the starting sugar after completing your mashing, this value will be used as the maximum. If you didn't set this or started the automatic brew right with the fermentation process, the maximum value of all available gravity readings will be used as a fallback. Also: You can **disable lines** in the graph by clicking on the respective item ("Gravity" or "% Fermentation") in the legend below the graph. --- # Agent Instructions: Querying This Documentation If you need additional information that is not directly available in this page, you can query the documentation dynamically by asking a question. Perform an HTTP GET request on the current page URL with the `ask` query parameter: ``` GET https://docs.bierbot.com/using-bricks/automatic-mode/gravity-history.md?ask= ``` The question should be specific, self-contained, and written in natural language. The response will contain a direct answer to the question and relevant excerpts and sources from the documentation. Use this mechanism when the answer is not explicitly present in the current page, you need clarification or additional context, or you want to retrieve related documentation sections.