Calculators for electronics and IoT projects

Free tools to size batteries and power budgets for ESP32, Arduino and other microcontrollers. They run in your browser, with no sign-up and no tracking.

Battery · deep sleep

Deep Sleep Budget

How long your ESP32, Arduino or nRF node lasts on a battery, and what is draining it.

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Runs in your browser

Nothing to install. The values you enter stay on your device.

Formulas in plain sight

Every tool explains how the result is calculated and which assumptions it makes.

Built from datasheets

Presets use typical values from manufacturer datasheets. Replace them with your own measurements.