# Subtracting Two Real time Values to get the result

**URL:** <https://forum.inductiveautomation.com/t/subtracting-two-real-time-values-to-get-the-result/17989>\
**Category:** Ignition\
**Created:** [May 10, 2018, 2:30pm UTC](https://forum.inductiveautomation.com/t/subtracting-two-real-time-values-to-get-the-result/17989 "2018-05-10T14:30:12Z")\
**Posts on this page:** 2\
**Page:** 1

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**Author:** ![mohammed.omar](https://avatars.discourse-cdn.com/v4/letter/m/ed655f/32.png) [@mohammed.omar](https://forum.inductiveautomation.com/u/mohammed.omar)\
**Post date:** [May 10, 2018, 2:30pm UTC](https://forum.inductiveautomation.com/t/subtracting-two-real-time-values-to-get-the-result/17989/1 "2018-05-10T14:30:12Z")

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Hi,

I am stuck with this expression to subtract 2 realtime different values to get the result in a numerical label.

I have HPP Discharge readings value and HPP Suction readings value, I have to find the differential pressure for these real time values.

Can anyone help!! I am currently using V7.5

![](https://us1.discourse-cdn.com/inductiveautomation/original/2X/4/4dfb8d589a7b5eb9fded5a3d50d24ed31cc54fc4.png)

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**Author:** ![witman](https://avatars.discourse-cdn.com/v4/letter/w/d2c977/32.png) [@witman](https://forum.inductiveautomation.com/u/witman)\
**Post date:** [May 10, 2018, 2:48pm UTC](https://forum.inductiveautomation.com/t/subtracting-two-real-time-values-to-get-the-result/17989/2 "2018-05-10T14:48:26Z")

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Basics like this and more are covered well in Inductive University materials. In this case, you’re looking for an expression binding:  
[https://inductiveuniversity.com/video/search/?q=expression%20binding](https://inductiveuniversity.com/video/search/?q=expression%20binding)