Car Battery State of Charge Calculator

Site Home

Electronics Home

Site Index

Electronics Index

Calculator Index

About Us

Privacy Policy

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.









HTML 5  ✔



Whilst I try to keep the information on this site accurate, I'm only human and I do occasionally make mistakes. I therefore advise you to check any information before using it for anything important. If you do find any errors, please let me know so that I can correct them.

Click here to report an error on this page.

This page was last changed on: 03 March 2018.

Thanks for visiting my site.
This site uses cookies; click here for details.
If you continue to use this site I'll assume you're happy to accept this.