Every electronic project is limited by its power supply. Whether you are working with a small microcontroller or a complete system of multiple sensors and motors, estimating power consumption is essential for predicting battery life, ensuring stable operation and preventing unexpected shutdowns.
This Power Budget Calculator lets you enter your power source details, then add multiple devices to calculate total current draw and runtime estimates. You can adjust voltage, capacity, quantity and efficiency to simulate real conditions and determine how long your system will run before the battery is empty.
Power Budget Calculator
Battery / Power Source
Devices
| Device Name | Volts (V) | Current (mA) | Qty | Power (W) |
|---|
Planning power consumption early prevents issues in long running or remote applications. This tool helps you estimate total watt hours, average current load and expected runtime based on battery capacity. It is useful for microcontroller projects, IoT devices, robotics systems and any portable electronic design.
Use this calculator when:
- Building low power IoT devices
- Estimating battery life for sensors or microcontrollers
- Comparing component power draw before purchase
- Planning solar or off grid systems
- Optimising efficiency for long runtime operation
If your build has multiple power states such as sleep mode or active cycles, run separate calculations to compare energy usage at each stage. This makes it easier to optimise and maximise battery life.