Free tool · Google list pricesWhat do your min instances cost?
Minimum instances keep Cloud Functions and Cloud Run warm, and you pay for them even when no requests arrive. Enter each one to see the idle cost per month.
Your functions and services
$9.86 a month
Idle cost of your min instances
$9.86 a month
$118.32 a year
Min instances are one line of the bill. The Firebase Cost-Cut Audit prices every service from measured usage and ranks each saving by dollars a month. $750, 5 business days.
Full refund if Simon can’t take it on once he sees your project, or if you cancel before work starts.
Each instance is priced for 730 hours a month at $0.0000025 per vCPU-second and $0.0000025 per GiB-second, assuming it sits idle the whole time; time spent handling requests is billed at the active rate instead. Prices are Google’s on-demand list prices for us-central1, checked 2026-10-12. Tier 2 regions cost more, committed use discounts cost less, and the monthly free tier (180,000 vCPU-seconds and 360,000 GiB-seconds) is shared with the rest of your Cloud Run usage on the billing account. Check the Cloud Run pricing page for your region.
Questions
Are minimum instances billed when there is no traffic?
Yes. Instances kept warm by a minimum instances setting are billed while idle. With request-based billing they are billed at a lower idle rate; idle instances that are not minimum instances are not charged.
Do Firebase Cloud Functions use these prices?
Cloud Functions for Firebase (2nd gen) run on Cloud Run, so their CPU and memory are billed at Cloud Run rates. First-generation functions use a different pricing model and are not covered by this calculator.
How do I find which functions set min instances?
Search your functions code for minInstances, including in setGlobalOptions, or open each service in the Cloud Run console, where the minimum instances setting is shown. The guide linked below walks through both.
Why is my actual bill different?
This calculator only covers idle min instances in us-central1 at list prices. Your bill also includes active request time, other regions, the free tier, discounts, Firestore, Storage, networking and logging.
Next: what min instances cost and when to cut them and how to cut your Firebase bill.
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