# Elastic clould price calculator. RAM size?

**URL:** <https://discuss.elastic.co/t/elastic-clould-price-calculator-ram-size/263742>\
**Category:** Elasticsearch\
**Created:** [February 9, 2021, 2:14pm UTC](https://discuss.elastic.co/t/elastic-clould-price-calculator-ram-size/263742 "2021-02-09T14:14:10Z")\
**Posts on this page:** 3\
**Page:** 1

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**Author:** ![Kosodrom](https://sea2.discourse-cdn.com/elastic/user_avatar/discuss.elastic.co/kosodrom/32/99278_2.png) [@Kosodrom](https://discuss.elastic.co/u/Kosodrom)\
**Post date:** [February 9, 2021, 2:14pm UTC](https://discuss.elastic.co/t/elastic-clould-price-calculator-ram-size/263742/1 "2021-02-09T14:14:10Z")

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Hi folks,

i am trying to use the this calculator: [https://cloud.elastic.co/pricing](https://cloud.elastic.co/pricing) and trying to size my cloud cluster and compare it to my current on prem cluster.

I know from the documentation that it is recomended to give elastic java process max heap of 50% total machine memory. And that is also what I have done on prem. I have 3 machines with 32GB RAM each, which means heap is max 16 GB per node \* 3 = **48 GB** heap.

Based on this fact can anyone answer me following question:

Is the RAM size showed in the calculator **the amount of machine memory which my cluster can consume** , meaning for nearly same cluster size I need to select roughly 87 GB RAM because I will have total of 43,5 GB of max heap. Is this correct?

 ![image](https://us1.discourse-cdn.com/elastic/original/3X/9/6/96f0326b8880087055c5afeff44c0c22cb02c6cf.png)

Or can I just select that exact number which corresponds to my desired heap size?

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**Author:** ![stephenb](https://sea2.discourse-cdn.com/elastic/user_avatar/discuss.elastic.co/stephenb/32/40856_2.png) [@stephenb](https://discuss.elastic.co/u/stephenb)\
**Post date:** [February 10, 2021, 6:11am UTC](https://discuss.elastic.co/t/elastic-clould-price-calculator-ram-size/263742/2 "2021-02-10T06:11:32Z")

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Hi @Kosodrom  
The RAM shown is the host RAM and the JVM heap will be set to 50% of that so yes your understanding is correct 87GB Host RAM an yes a total of 43.5 GB of JVM Heap

(European to US number format conversion included) 🙂

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**Author:** ![system](https://us1.discourse-cdn.com/elastic/original/3X/1/a/1ac57faf039f6b580b3f104ef42a2a89e41014de.png) [@system](https://discuss.elastic.co/u/system)\
**Post date:** [March 10, 2021, 6:12am UTC](https://discuss.elastic.co/t/elastic-clould-price-calculator-ram-size/263742/3 "2021-03-10T06:12:21Z")

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