Free Home Assistant Energy Calculators
Build transparent energy-cost scenarios from your own measurements, quotes, and tariffs. Results are arithmetic estimates, not forecasts or guarantees.
💰 Measured Bill-Change Calculator
Apply a percentage you measured before and after a change to your own current bill.
☀️ Solar Scenario Calculator
Use measured annual generation, self-consumption, your quote, and current rates.
🔋 EV Charging Cost Calculator
Compare two charging rates using your measured vehicle consumption and distance.
📊 Peak Shaving Calculator
Compare a measured current peak with a tested target using your published demand rate.
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Our comprehensive guides show you exactly how to build these automations in Home Assistant. Get step-by-step instructions, tested configurations, and expert optimization strategies.