# Math exponential function
**URL:** https://discourse.nodered.org/t/math-exponential-function/16146
**Category:** General
**Created:** [1 October 2019 12:26 UTC](https://discourse.nodered.org/t/math-exponential-function/16146 "2019-10-01T12:26:33Z")
**Posts on this page:** 3
**Page:** 1
### Author:  [@Venom](https://discourse.nodered.org/u/Venom)
#### Post date: [1 October 2019 12:26 UTC](https://discourse.nodered.org/t/math-exponential-function/16146/1 "2019-10-01T12:26:33Z")
Hello
I have a function called y = 1034,7e^-0,028x. I have used this Math.log(number/1024)/-0.028 and it works most of the time but isn´t always precise. I heard that you can somehow input this y = 1034,7e^-0,028x and it will be more precise. Anyone has any clues on how to do this?
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### Author:  [@kuema](https://discourse.nodered.org/u/kuema)
#### Post date: [1 October 2019 13:00 UTC](https://discourse.nodered.org/t/math-exponential-function/16146/2 "2019-10-01T13:00:36Z")
Javascript numbers are 64-bit floating points, so you have a limited precision.
> **[Number](https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/Number)**
>
> The Number JavaScript object is a wrapper object allowing you to work with numerical values. A Number object is created using the Number() constructor. A primitive type object number is created using the Number() function.
If you need arbitrary precision for your calculations, I believe there are NodeJS packages on NPM that could do that for you. These can be made available in your `settings.js` in the `functionGlobalContext` object for use in a function node.
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### Author:  [@Colin](https://discourse.nodered.org/u/Colin)
#### Post date: [1 October 2019 13:39 UTC](https://discourse.nodered.org/t/math-exponential-function/16146/3 "2019-10-01T13:39:10Z")
Can you show an example with the value of x, the result and what it should be?
Also show the code in the function node that calculates it.