RTC battery lifetime online calculator

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Free calculator to estimate how long your battery (e.g. CR2032) will last in your microcontroller RTC application. Note: The default capacity of 220 mAh is a typical capacity for a CR2032 coin cells.

TechOverflow calculators:
You can enter values with SI suffixes like 12.2m (equivalent to 0.012) or 14k (14000) or 32u (0.000032).
The results are calculated while you type and shown directly below the calculator, so there is no need to press return or click on a Calculate button. Just make sure that all inputs are green by entering valid values.