prefixkit Ask an engineerAsk Support RU

Smart home

Electricity cost calculator

Work out how much electricity and money a device costs per month and per year from its power, hours per day and your tariff. Presets for a router, a smart home server, a fridge, a water heater and standby.

Presets: · · · · · · · ·

Everything runs in the browser: nothing is sent anywhere.

Finding the real power draw

The label shows the maximum; a fridge or air conditioner usually draws less. The most accurate way is a smart plug with energy metering: Home Assistant shows the power and the monthly use in the Energy dashboard. Plugs with metering are in the Zigbee catalog.

Smart plug with energy metering: AliExpress

Links open a search in the shop; some are affiliate links: buying through them costs you nothing extra and supports this site. We do not sell devices or get them from manufacturers.

More tools: smart home

Home Assistant tools newEverything for the smart home section in one place.Remote access to Home Assistant newCloudflare Tunnel, nginx, Caddy, WireGuard configs.ESPHome generator newBoard and sensors to a ready YAML with keys.Zigbee coordinator picker newWhich stick for ZHA, Zigbee2MQTT and Thread.Zigbee device catalog new5,400 devices: features, MQTT, automations.ESP32 pinout newWhich GPIOs are safe: ESP32, C3, S3, ESP8266.MQTT discovery generator newConfig topic and JSON for Home Assistant.Zigbee channel vs Wi-Fi newPick a Zigbee channel clear of your Wi-Fi.Camera RTSP URL newHikvision, Dahua, Reolink, Tapo stream URLs.Frigate config generator newCameras, go2rtc, Coral or OpenVINO.Zigbee2MQTT config newAdapter, port, MQTT, channel.Home Assistant Docker Compose newHA, Mosquitto, Zigbee2MQTT, ESPHome stack.Mosquitto config newPasswords, ACL, WebSocket, TLS.undefinedHA template tester newJinja templates with states(), now(), filters.Which server for HA newGreen, Raspberry Pi 5 or an N100 mini PC.Automation syntax converter newservice → action, triggers:, conditions:.ESPHome Bluetooth proxy newBLE everywhere in the house via ESP32.ESPHome devices newPlugs and relays: pinouts and starter configs.Dashboard card generator newTile, Mushroom, gauge, history YAML.undefinedHome Assistant API newcurl, Python, JS requests and webhooks.Home Assistant and Alice newYandex Smart Home setup and config.MQTT client newTest a broker over WebSocket in the browser.Home Assistant YAML checker newAutomations and configuration.yaml mistakes.Tasmota commands newMQTT and Home Assistant in one Backlog.Shelly API newLocal HTTP RPC and MQTT commands.
Idea?