Percentage based on an amound that changes

Configuration
1

Hi, is it possible to get a percentage based an amount that changes on the last hour or day? For example I have a sensor that collects an amount, if this drops 5 percent in a certain hour I want to see this percentage in HA. such as: -5% in the last hour. And the same for the latest day.

thanks

2

It depends on what percentage you want. Percentage change from the current value is easy:

Calculate the numerical change from 1 hour ago and 24 hours ago.

sensor:
  - platform: statistics
    name: "Hourly Change"
    entity_id: sensor.your_sensor_here
    state_characteristic: change
    max_age:
      hours: 1
  - platform: statistics
    name: "Daily Change"
    entity_id: sensor.your_sensor_here
    state_characteristic: change
    max_age:
      hours: 24

Convert to a percentage of the current value on the hour and at the end of the day:

template:
  - trigger:
      - platform: time_pattern
        hours: "/1" # trigger every hour
    sensor:
      - name: "Percent Hourly Change"
        unit_of_measurement: "%"
        state: "{{ 100 * states('sensor.hourly_change')|float(0)/states('sensor.your_sensor here')|float(1) }}"
        availability: "{{ states('sensor.hourly_change')|is_number and states('sensor.your_sensor here')|is_number }}"
  - trigger:
      - platform: time
        at: "0:00:00" # trigger at midnight
    sensor:
      - name: "Percent Daily Change"
        unit_of_measurement: "%"
        state: "{{ 100 * states('sensor.daily_change')|float(0)/states('sensor.your_sensor here')|float(1) }}"
        availability: "{{ states('sensor.daily_change')|is_number and states('sensor.your_sensor here')|is_number }}"

Or if you want rolling hourly and 24 hourly % change just remove the triggers.

template:
  - sensor:
      - name: "Percent Hourly Change"
        unit_of_measurement: "%"
        state: "{{ 100 * states('sensor.hourly_change')|float(0)/states('sensor.your_sensor here')|float(1) }}"
        availability: "{{ states('sensor.hourly_change')|is_number and states('sensor.your_sensor here')|is_number }}"
  - sensor:
      - name: "Percent Daily Change"
        unit_of_measurement: "%"
        state: "{{ 100 * states('sensor.daily_change')|float(0)/states('sensor.your_sensor here')|float(1) }}"
        availability: "{{ states('sensor.daily_change')|is_number and states('sensor.your_sensor here')|is_number }}"

If you want % cahnge compared to the value an hour ago or 24 hours ago that gets a little trickier. You have to store those values and use them later.

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