Basic templating: Calculating percentages


Been doing some templating in configuration.yaml for my Toyota integration, but faced some basic calculation block in defining new sensors. Been looking for the guides but still I cannot figure out what goes wrong, will be a small thing for sure, but I cannot figure it out.

I have the following sensor defined in configuration.yaml and it works great. It defines what percentage I have been driving electric in a week.

      #Toyota EV percentage
        value_template: "{{ states.sensor.xpt_410_current_week_statistics.attributes.EV_distance_percentage }}"
        unit_of_measurement: '%'
        friendly_name: Corolla EV percentage - Week

I would like to use that electric distance percentage to calculate how much did I drive by using fuel. Tried the most obvious calculation by substracting the EV-distance from 100%:

      #Toyota fuel percentage
        value_template: "{{ 100 | float - states('sensor.xpt_410_current_week_statistics.attributes.EV_distance_percentage') | float }}"
        unit_of_measurement: '%'
        friendly_name: Corolla fuel percentage - Week

But the value of this fuel percentage sensor is 100.0%, so basically my calculation is not working. I have been trying different formats using parentheses etc. but the sensor value still stays 100.0%.

Any clear advice for the noob what I am missing here? :smiley:

That’s an incorrect usage of the states() function.

If you want to use the value of an entity’s attribute, use the state_attr() function.

        value_template: "{{ 100 - state_attr('sensor.xpt_410_current_week_statistics', 'EV_distance_percentage') | float(0) }}"

For more information refer to: Templating - States

Hey, this works! Have to check a bit more detailed the manuals :slight_smile: thanks alot!

You’re welcome!

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