⚡ Turn any device into an energy monitor, no smart plug required

PowerCalc estimates energy consumption for devices that can't measure it themselves, like lights, fans and media players, with no extra hardware. Instead of measuring power directly, it accurately estimates consumption using smart models based on real measurements, all inside Home Assistant.

On top of power and energy sensors, PowerCalc also creates cost sensors to track spending, utility meters to break usage down by day, week or month, and group sensors to combine devices, rooms or your whole home into a single total.

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See it in action

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Why use PowerCalc?

• 💰 Save money - no need to buy smart plugs for every device
• 🔍 Full visibility - track energy usage across your entire home
• ⚡ Accurate estimates - based on real device measurements
• 🔌 Works out of the box - huge built-in profile library
• 🧠 Advanced modeling - brightness, color, fan speed, and more

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How it works

PowerCalc creates virtual power sensors in Home Assistant.

For example:

• 💡 Lights → power based on brightness, color, temperature
• 🌀 Fans → power based on speed
• 📺 Other devices → configurable strategies or measured profiles

You get realistic energy data — without physically measuring every device.

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Get started

• 👉 Quick Start Guide
• 📚 Full Documentation
• 🔎 Device Profile Library

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🌍 Community & contributions

PowerCalc is powered by a growing community:

• Contribute new device profiles
• Share measurements
• Improve accuracy for everyone

See CONTRIBUTING.md to get started, and the Code of Conduct for how we work together.

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⭐ Support the project

If PowerCalc helped you:

• ⭐ Star this repository
• ☕ Buy me a coffee

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