Estimated SOC
TOOLS
SOC Estimator
Estimate battery SOC from OCV and temperature with chemistry-aware OCV-SOC curve fitting.
How this works
SOC = f(OCV, T, chemistry)
Methodology
SOC is determined from OCV using chemistry-specific polynomial curve fits for LFP, NMC, and NCA. Temperature compensation applies Nernst-derived correction factors from -20°C to 60°C.
Calculator Inputs
Cell & Measurement
V
min
Thermal Correction
C
Uncertainty
±30%
In LFP plateau region - OCV-SOC unreliable
OCV-SOC Curve with Hysteresis
Discharge Charge Your measurement
LFP Note: The flat plateau (3.2-3.3V from 20-80% SOC) makes OCV-SOC lookup unreliable in this region. Consider using coulomb counting for better accuracy.