Battery cold-cranking comparison

Compare the cold-cranking (CCA, SAE) and cranking (CA/MCA) ratings of the same fully charged battery. Enter the battery temperature, which may differ from ambient air. This calculator uses −18 °C for CCA and 0 °C for CA. The common 0 °F CCA shorthand is approximately −18 °C.

For −18 ≤ T ≤ 0, the illustration is I(T) = CCA + (CA − CCA) × (T + 18)/18. The endpoints reproduce the entered ratings exactly. Interior values assume a straight line; no measured temperature curve is implied. There is no extrapolation outside these temperatures and no universal CA/CCA conversion factor. Ratings must use comparable test conditions; EN, DIN and SAE values must not be mixed.

Example loads 600 CCA and 700 MCA from the ODYSSEY ODP-AGM96R specifications (checked 14 September 2026). At −9 °C, linear interpolation gives 650 A. This interior value is calculated here, not manufacturer test data. Replace the example with the ratings of your own battery.

The manufacturer manual describes SAE-style CCA and CA as 30-second ratings with a 1.2 V per-cell threshold. Yuasa explains differences between rating standards. Age, charge, chemistry, condition, cables and engine load are not modeled. The output cannot determine state of charge, capacity, battery health or whether an engine will start.

Both ratings accept 0–5,000 A. A zero rating is an arithmetic boundary, not a claim that a real battery is usable. Calculate explicitly; editing removes old results. Reset clears the result and retains inputs. Valid inputs remain when returning through app navigation.