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Based on the infrastructure data that you have about your current on-premises
environment, enter your best estimates for CPU, memory, and storage. Enter the
total aggregate count of memory across all systems
in the data center. Also, specify the total aggregate storage footprint,
including all direct-attached storage (DAS)
and network-attached storage (NAS).
On the Start your estimate page, in the On-premise card, click
Start.
If you've completed estimation for another environment and want to start
specifying details in the On-premise cost calculator, then on the
results page, click Start in the On-premise card.
On the Estimate basics tab, from the Location list, choose a location
where you want your workloads to be located.
To specify infrastructure details, click Next.
Specify infrastructure details
On the Infrastructure tab, follow these steps:
In the Total vCPUs to be migrated section, in the Number of vCPUs
field, enter the number of x86 vCPUs you want to migrate to Google Cloud.
The Data center memory required field is automatically updated based on
the default memory to compute ratio, which is 4:1.
If you're migrating non-x86 infrastructure and want to include it in your
cost estimate, then in the Total vCPUs to be migrated section, select
Include non-x86 infrastructure. Then,
specify non-x86 infrastructure details
in the additional fields that appear.
In the Storage currently in use in your data center(s) section, follow
these steps:
In the Total storage (TB) field, enter the total storage, in
TB, that you have in your data center.
In the % File Storage, % Block Storage, and % Object Storage
fields, enter the percentage of total storage used by file, block, and
object storage respectively.
Under Storage location, select the locations where you want your
storage to be located. If you select multiple locations, then new fields
appear where you need to specify the percentage distribution of storage
for every location.
In the CDN data transfer out bandwidth field, enter the amount
of data transfer out bandwidth used for Google Cloud
Content Delivery Network, in GB.
Select how you want to calculate your networking costs:
If you select Percentage of total compute cost, then specify
the networking costs you expect to have as a percentage of your
compute costs.
If you select Monthly network bandwidth, then specify your
estimated networking bandwidth per month in TB, and the percentage
of the external network traffic, excluding the data center traffic.
From the currency list on the right, choose the currency you want to use for
your cloud cost estimate.
To specify enterprise workload details, click Next.
Specify non-x86 infrastructure details
If you're migrating mainframes, then in the Mainframe section,
select I am migrating mainframes and follow these steps:
In the Mainframe MIPS # field, enter the mainframe million instructions
per second capacity.
Under Mainframe Colocation or Rehosting (Emulation), choose whether
you want to use Colocation or Rehosting for your mainframes.
If you're migrating Unix cores, then follow these steps:
In the Number of UNIX vCPUs field, enter the number of Unix vCPUs you
want to migrate.
In the UNIX vCPU distribution section, specify the percentage
distribution of the Unix cores.
In the Unix infrastructure type field, choose if you want a
Managed Service Provider for your Unix vCPUs or you want them to be
Emulated.
[[["Easy to understand","easyToUnderstand","thumb-up"],["Solved my problem","solvedMyProblem","thumb-up"],["Other","otherUp","thumb-up"]],[["Hard to understand","hardToUnderstand","thumb-down"],["Incorrect information or sample code","incorrectInformationOrSampleCode","thumb-down"],["Missing the information/samples I need","missingTheInformationSamplesINeed","thumb-down"],["Other","otherDown","thumb-down"]],["Last updated 2025-08-29 UTC."],[],[],null,["# Specify infrastructure details\n\nBased on the infrastructure data that you have about your current on-premises\nenvironment, enter your best estimates for CPU, memory, and storage. Enter the\ntotal aggregate count of memory across all systems\nin the data center. Also, specify the total aggregate storage footprint,\nincluding all [direct-attached storage (DAS)](https://en.wikipedia.org/wiki/Direct-attached_storage)\nand [network-attached storage (NAS)](https://en.wikipedia.org/wiki/Network-attached_storage).\n\nBefore you begin\n----------------\n\n- Complete the steps to [start a cost estimate](/migration-center/docs/estimate/start-estimation).\n\nSpecify basic estimate details\n------------------------------\n\n1. On the **Start your estimate** page, in the **On-premise** card, click\n **Start**.\n\n If you've completed estimation for another environment and want to start\n specifying details in the **On-premise** cost calculator, then on the\n results page, click **Start** in the **On-premise** card.\n2. On the **Estimate basics** tab, from the **Location** list, choose a location\n where you want your workloads to be located.\n\n3. To specify infrastructure details, click **Next**.\n\nSpecify infrastructure details\n------------------------------\n\nOn the **Infrastructure** tab, follow these steps:\n\n1. In the **Total vCPUs to be migrated** section, in the **Number of vCPUs**\n field, enter the number of x86 vCPUs you want to migrate to Google Cloud.\n\n The **Data center memory required** field is automatically updated based on\n the default memory to compute ratio, which is 4:1.\n2. Optional: To edit the [compute sizing default assumptions](/migration-center/docs/estimate/review-defaults#compute_sizing_default_assumptions)\n used for this estimate click **Edit compute sizing details**.\n\n3. If you're migrating non-x86 infrastructure and want to include it in your\n cost estimate, then in the **Total vCPUs to be migrated** section, select\n **Include non-x86 infrastructure** . Then,\n [specify non-x86 infrastructure details](#specify_non-x86_infrastructure_details)\n in the additional fields that appear.\n\n4. In the **Storage currently in use in your data center(s)** section, follow\n these steps:\n\n 1. In the **Total storage (TB)** field, enter the total storage, in\n TB, that you have in your data center.\n\n 2. In the **% File Storage** , **% Block Storage** , and **% Object Storage**\n fields, enter the percentage of total storage used by file, block, and\n object storage respectively.\n\n 3. Under **Storage location**, select the locations where you want your\n storage to be located. If you select multiple locations, then new fields\n appear where you need to specify the percentage distribution of storage\n for every location.\n\n 4. Optional: To edit the [storage sizing default assumptions](/migration-center/docs/estimate/review-defaults#storage_sizing_default_assumptions)\n used for this estimate, click **Edit storage sizing details**.\n\n5. In the **Networking** section, follow these steps:\n\n 1. In the **CDN data transfer out bandwidth** field, enter the amount\n of data transfer out bandwidth used for Google Cloud\n Content Delivery Network, in GB.\n\n 2. Select how you want to calculate your networking costs:\n\n - If you select **Percentage of total compute cost**, then specify the networking costs you expect to have as a percentage of your compute costs.\n - If you select **Monthly network bandwidth**, then specify your estimated networking bandwidth per month in TB, and the percentage of the external network traffic, excluding the data center traffic.\n6. From the currency list on the right, choose the currency you want to use for\n your cloud cost estimate.\n\n7. To specify enterprise workload details, click **Next**.\n\n### Specify non-x86 infrastructure details\n\n1. If you're migrating mainframes, then in the **Mainframe** section,\n select **I am migrating mainframes** and follow these steps:\n\n 1. In the **Mainframe MIPS #** field, enter the mainframe million instructions\n per second capacity.\n\n 2. Under **Mainframe Colocation or Rehosting (Emulation)** , choose whether\n you want to use **Colocation** or **Rehosting** for your mainframes.\n\n2. If you're migrating Unix cores, then follow these steps:\n\n 1. In the **Number of UNIX vCPUs** field, enter the number of Unix vCPUs you\n want to migrate.\n\n 2. In the **UNIX vCPU distribution** section, specify the percentage\n distribution of the Unix cores.\n\n 3. In the **Unix infrastructure type** field, choose if you want a\n **Managed Service Provider** for your Unix vCPUs or you want them to be\n **Emulated**.\n\n3. Optional: To edit the [non-x86 sizing default assumptions](/migration-center/docs/estimate/review-defaults#non-x86_sizing_default_assumptions)\n used for this estimate, click **Edit non-x86 sizing details**.\n\nWhat's next\n-----------\n\n- To continue with your estimate, see how to [specify workload and license details](/migration-center/docs/estimate/enterprise-workloads).\n- Optional: To review the default assumptions that are used to calculate your cloud cost estimate, see how to [review the default assumptions](/migration-center/docs/estimate/review-defaults)."]]
