---
title: "EnergyCalc"
description: "EnergyCalc is a Marketplace integration for Home Assistant. It has 66 installs sharing analytics, works locally and was last updated August 17, 2026."
canonical: "https://vulpo.app/integrations/marketplace/zacs-ha-energycalc"
url: "https://vulpo.app/integrations/marketplace/zacs-ha-energycalc.md"
last-updated: "2026-10-22"
version: "1.4"
---

# EnergyCalc

> EnergyCalc is a Marketplace integration for Home Assistant. It has 66 installs sharing analytics, works locally and was last updated August 17, 2026.

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](https://vulpo.app/contact)

[Open in My Home Assistant](https://my.home-assistant.io/redirect/hacs_repository/?owner=zacs&repository=ha-energycalc&category=integration)

On Home Assistant 2026.11 or newer? [Open it in the Marketplace](https://my.home-assistant.io/redirect/marketplace_repository/?owner=zacs&repository=ha-energycalc&category=integration)

## 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.

## 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 sensor**: The power sensor to integrate. It must report watts.
- **Integration method**: The Riemann sum method used to approximate the integral.
- **Unit**: The unit of the energy sensor.
- **Precision**: Number of decimal places to round the result to.
- **Max sub-interval**: How long to wait for a source update before integrating the last known value again.

Texts from the code of [zacs/ha-energycalc](https://github.com/zacs/ha-energycalc).

## Entities

- **Buttons**: Reset energy

## Actions

- **Create energy sensor**: Creates 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 sensor**: Removes 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](https://github.com/zacs/ha-energycalc#readme), [MIT License](https://spdx.org/licenses/MIT.html). Shortened.

## At a glance

- Kind: Marketplace integration
- Category: [Energy](https://vulpo.app/integrations/category/energy.md), Meters and monitoring
- Number: 66 installs sharing analytics; 6 GitHub stars
- Connection: Works locally
- Upkeep: Updated in the last 6 months
- Needs: Needs the Marketplace (HACS on 2026.10 and older)
- Latest version: v2.0.0, last updated August 17, 2026
- Domain: `energycalc`
- Source: <https://github.com/zacs/ha-energycalc>
- Issues: <https://github.com/zacs/ha-energycalc/issues>

In Vulpo: Button card, Chart card, Apple Watch

Independent directory, made by the developer of Vulpo. Not affiliated with Home Assistant or the Open Home Foundation. [About these numbers](https://vulpo.app/integrations/about)

Last updated 2026-10-22. Source: https://vulpo.app/integrations/marketplace/zacs-ha-energycalc

---

- HTML version of this page: https://vulpo.app/integrations/marketplace/zacs-ha-energycalc
- Site index for agents: https://vulpo.app/llms.txt
- Everything in one document: https://vulpo.app/llms-full.txt
- All pages: https://vulpo.app/sitemap.xml