CCA to mAh Calculator
Estimate battery capacity in milliamp-hours (mAh) from Cold Cranking Amps (CCA) instantly. Convert automotive starting power into estimated total energy storage capacity.
CCA to mAh Calculator
How to Use CCA to mAh Calculator
Converting Cold Cranking Amps (CCA) to milliamp-hours (mAh) involves estimating capacity based on voltage and discharge parameters. Follow these steps to use the calculator effectively:
- 1Enter CCA value. Input the Cold Cranking Amps rating of your battery (e.g., 600).
- 2Select battery voltage. Choose the nominal voltage of the battery from the dropdown list (e.g., 12 V).
- 3Enter discharge duration. Input the estimated discharge time in hours (typically 0.5 hours for estimates).
- 4Press Calculate. Click the Calculate button to compute the estimated capacity.
- 5Read outputs. Review the estimated mAh, Ah and Wh outputs provided by the tool.
How to Calculate CCA to mAh
Because CCA measures peak starting current and mAh measures total capacity, there is no direct conversion. However, you can estimate the equivalent capacity using the relationship between voltage, time, and current. Follow these formulas to calculate the estimated conversion:
Main Formulas
Example Calculation
Let's calculate the estimated capacity for a battery with the following parameters:
- CCA: 600 A
- Voltage: 12 V
- Time: 0.5 h
Step 1
mAh = (600 × 12 × 0.5 × 1000) ÷ 12
mAh = 300000
Step 2
Ah = 300000 ÷ 1000
Ah = 300 Ah
Step 3
Wh = 300 × 12
Wh = 3600 Wh
Final Answer
- Estimated capacity = 300000 mAh
- Equivalent capacity = 300 Ah
- Estimated energy = 3600 Wh
CCA to mAh Chart
This reference chart displays estimated capacity values in mAh, Ah, and Wh based on different CCA ratings. Note that these values are estimated using a 12-volt battery and a 0.5-hour discharge duration assumption.
| CCA | Estimated Ah | Estimated mAh | Estimated Wh |
|---|---|---|---|
| 100 | 50 Ah | 50000 mAh | 600 Wh |
| 200 | 100 Ah | 100000 mAh | 1200 Wh |
| 300 | 150 Ah | 150000 mAh | 1800 Wh |
| 400 | 200 Ah | 200000 mAh | 2400 Wh |
| 500 | 250 Ah | 250000 mAh | 3000 Wh |
| 600 | 300 Ah | 300000 mAh | 3600 Wh |
| 700 | 350 Ah | 350000 mAh | 4200 Wh |
| 800 | 400 Ah | 400000 mAh | 4800 Wh |
| 1000 | 500 Ah | 500000 mAh | 6000 Wh |
Note: Values are estimated using a 12-volt battery and a 0.5-hour discharge duration. They are not direct measurements.
CCA to mAh Frequently Asked Questions
You cannot directly convert CCA to mAh because they measure entirely different things. CCA measures maximum instantaneous power output for starting an engine, while mAh measures total energy storage capacity over time. However, larger CCA batteries typically have higher overall mAh capacities.
mAh stands for milliampere-hour. It is a unit that measures electric power over time and represents the total energy capacity of a battery. A battery with a rating of 1000 mAh can theoretically deliver 1000 milliamps of current for one hour, or 500 milliamps for two hours before fully draining.
People sometimes compare CCA and mAh when trying to replace a traditional lead-acid starter battery with a lithium jump starter or when building custom battery packs. Understanding both values helps ensure the new battery can both start the engine (CCA) and run electronics for long enough (mAh).
Car batteries are usually rated in Amp-hours (Ah) rather than mAh because of their large capacity. To find the mAh, you locate the Ah rating (e.g., 50Ah) and multiply it by 1000. So, a standard 50Ah car battery has a capacity of 50,000 mAh. This capacity varies depending on the battery model.
A higher capacity (mAh or Ah) is better if you run accessories with the engine off, as it will last longer before dying. However, for actually starting the car, the CCA rating is far more important. A battery with massive mAh but low CCA might fail to start your vehicle in cold weather.