Car Battery State of Charge Calculator

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Enter the open circuit voltage and the temperature, in either °F or °C. The state of charge will then be calculated automatically.


Measured Voltage  V The voltage measured across the battery terminals when the battery is not supplying (a significant) current or being charged.
    
Temperature °F Ideally this would be the temperature of the battery electrolyte but if the battery has not been charged or used for a few hours the surrounding air temperature will probably be close enough.
°C 
    

 


Battery TypeState of Charge
Low Maintenance or standard (batteries with filler caps)
 
Maintenance free, sealed, AGM or Gel cells (batteries without filler caps)
 

This calculator uses a polynomial fit to data from "TEMPERATURE COMPENSATED BATTERY STATE-OF-CHARGE (SoC) TABLES (Revised October 2nd 2017)" downloaded from www.batteryfaq.org.






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This page was last changed on: 02 August 2021.

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