IoT Device Power Consumption Calculator
Estimate daily energy consumption for your hardware sensors and IoT nodes.
Operating voltage of your IoT device
Average current draw in milliamps
How many hours per day the device is active
Why track IoT power?
Tracking consumption is vital for optimizing battery life in remote sensors and managing total energy costs in large deployments. A device drawing 20mA continuously at 3.3V uses about 1.58 Wh per day. Over a year, this adds up to 577 Wh—critical for battery sizing or solar-powered installations. Understanding power profiles helps identify optimization opportunities.
What is Wh (Watt-hour)?
Wh (Watt-hour) is the unit of energy representing one watt of power used over one hour. It's calculated as Voltage × Current × Time. For battery-powered devices, Wh determines how long a battery will last. A 10Wh battery powering a 0.5W device lasts approximately 20 hours. Utility companies bill in kWh (1,000 Wh), so this metric also helps estimate operating costs.
How to reduce IoT device power consumption?
Key strategies include: implementing deep sleep modes between measurements (reducing current from mA to μA), reducing transmission frequency (send data hourly instead of every minute), using low-power communication protocols (LoRaWAN, NB-IoT), optimizing firmware to minimize active time, selecting low-quiescent-current regulators, and duty-cycling sensors rather than keeping them always-on.
How do I calculate battery life for my IoT device?
Battery life (hours) = Battery Capacity (Wh) / Device Power Consumption (W). For a 3.7V 2000mAh battery (7.4Wh) powering a 0.066W device (3.3V × 20mA), theoretical runtime is 7.4 / 0.066 ≈ 112 hours or ~4.7 days. Real-world runtime will be less due to battery self-discharge, temperature effects, and peak current draws. Add 20-30% margin for practical estimates.