Adding to a sensor using value template

This is probably an easy fix but I have having a brain block on it. I have a sensor that I want to add 125 to the value. For the life of me I cannot figure out how to do it.

Say the value being sent is 500, I would like the sensor to return 625

sensor:
  - platform: mqtt
    state_topic: 'Pool/ORP'
    value_template: '{{ "%.3f"|format(value|float) }}'
    name: 'Pool ORP'
value_template: '{{ "%.3f"|format(value|float + 125) }}'

Thanks I new it was something easy.

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