> ## Documentation Index
> Fetch the complete documentation index at: https://docs.coreweave.com/llms.txt
> Use this file to discover all available pages before exploring further.

# How do I choose the right instance type?

Picking an instance comes down to three things: GPU memory for your model, regional availability, and capacity commitment.

* **GPU memory.** Estimate the memory your model needs using the precision-based formulas (FP16, INT8, INT4) and the training overhead multiplier documented in [Selecting an instance](/platform/instances/selecting-an-instance), then pick an instance whose aggregate GPU memory exceeds that.
* **Regional availability.** Not every instance is in every Availability Zone. Check the [Instance Availability Matrix](/platform/instances/availability-matrix) to confirm your target instance is in your target region.
* **Capacity plan.** Reserved Instances, Flex Reservations, On-Demand, and Spot trade cost for guarantees in different ways. See [Capacity plans](/platform/capacity-plans).

[Contact CoreWeave support](/support/contact) for help sizing your GPU requirements, finding capacity in a specific region, or choosing between capacity plans.

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