EnergyCalc for Home Assistant (Marketplace integration)

Installs: 66 sharing analytics
GitHub stars: 6
Connection: Works locally
Upkeep: Updated in the last 6 months
Version: v2.0.0, August 17, 2026
Category: Energy, Meters and monitoring
Kind: Marketplace integration
Needs: Needs the Marketplace (HACS on 2026.10 and older)
Domain: energycalc
Source: github.com/zacs/ha-energycalc
Issues: Report an issue

Independent directory, made by the developer of Vulpo. Not affiliated with Home Assistant or the Open Home Foundation.

About

EnergyCalc is a custom integration that adds energy sensors in kWh to devices that only report power in watts. It scans the entity registry for power sensors with no matching energy sensor and offers to create one for each, linked to the existing device. The generated sensors integrate power over time, which makes power-only devices usable in the Energy Dashboard. Each sensor has settings for the integration method, unit, decimal precision and a maximum sub-interval before the last known value is integrated again. A reset button is included, and actions exist to create and remove energy sensors. It works locally and is configured in the UI, with optional automatic discovery enabled through a configuration entry and an exclusion list for chosen power entities.

Automatic summary of the README and code of zacs/ha-energycalc. Something wrong, or are you the maintainer and want your own text here? Get in touch

Supports

Works locally Talks to your devices on your own network. No vendor cloud in between.
From the Marketplace Installed through the Marketplace, formerly HACS.
Actively maintained Its author released or pushed a change in the last six months.

Provides

Sensors

Setting it up

Install it from the Marketplace and restart Home Assistant, then add it under Settings, Devices and services.

Add an energy sensor

Power sensorThe power sensor to integrate. It must report watts.
Integration methodThe Riemann sum method used to approximate the integral.
UnitThe unit of the energy sensor.
PrecisionNumber of decimal places to round the result to.
Max sub-intervalHow long to wait for a source update before integrating the last known value again.

Texts from the code of zacs/ha-energycalc.

Entities

ButtonsReset energy

Actions

Create energy sensorCreates an energy (kWh) sensor that integrates a power (W) sensor over time.Fields: Source entity, Integration method, Precision, Metric prefix, Max sub-interval
Remove energy sensorRemoves an energy sensor created by EnergyCalc.Fields: Entity

From the README

EnergyCalc is a Home Assistant custom component that automatically discovers devices with power sensors (W) but missing total energy sensors (kWh) and offers to create energy tracking entities. This is useful for integrating power-only devices with Home Assistant's Energy Dashboard.

From the README of zacs/ha-energycalc, MIT License. Shortened.