Compute Engine Cost Calculator

monthly = instances × (vCPU × vCPU rate + GB × GB rate) × hours × usage share × (1 − discount), where the sustained use discount ramps as max × (usage share − 25%) ÷ 75%. Custom machine types price vCPU and memory on two independent meters, so the hourly rate is a sum rather than a lookup. Sustained use discounts are applied automatically and grow with how much of the month the instance runs — the first quarter of the month earns nothing and the full maximum only lands at a complete month — while committed use discounts and Spot replace the list rate outright.

Compute is normally the biggest line on a Google Cloud invoice and the same shape can differ by more than half between on-demand and a 3-year commitment or Spot, so the model you pick matters more than the size you pick. Confirm the current per-vCPU and per-GB rates for your region in the Google Cloud pricing calculator before committing.

This calculator takes 12 inputs: Number of instances, vCPUs per instance, Memory per instance, Price per vCPU-hour, Price per GB-hour, Hours in the billing month, Share of the month the instance runs, Pricing model, Maximum sustained use discount, 1-year commitment discount, 3-year commitment discount, Spot discount. The pre-filled defaults are a realistic starting point — replace them with figures from your own environment for a result you can act on.

No. Committed use discounts replace the on-demand rate for the covered resources, so sustained use discounts do not also apply to them. This calculator therefore applies one model at a time, which is how the invoice behaves.