This document explains Firestore pricing details. It also tells you how to limit and monitor your spending on Firestore.
If you pay in a currency other than USD, the prices listed in your currency on Cloud Platform SKUs apply.
Pricing overview
When you use Firestore, you are charged for the following:
- The number of reads, writes, and deletes that you perform.
- The amount of storage that your database uses, including overhead for metadata and indexes.
- The amount of network bandwidth that you use.
Storage and bandwidth usage are calculated in gigabytes (GiB), where 1 GiB = 230 bytes. All charges accrue daily.
The following sections provide details about how you are charged for your Firestore usage.
Pricing by location
The following table lists pricing for reads, writes, deletes, and storage for each Firestore location:
If you pay in a currency other than USD, the prices listed in your currency on Cloud Platform SKUs apply.
Reads, writes, and deletes
You are charged for each document read, write, and delete that you perform with Firestore.
Charges for writes and deletes are straightforward. For writes, each set or
update operation counts as a single write.
Charges for reads have some nuances that you should keep in mind. The following sections explain these nuances in detail.
Listening to query results
Firestore allows you to listen to the results of a query and get realtime updates when the query results change.
When you listen to the results of a query, you are charged for a read each time a document in the result set is added or updated. You are also charged for a read when a document is removed from the result set because the document has changed. (In contrast, when a document is deleted, you are not charged for a read.)
Also, if the listener is disconnected for more than 30 minutes (for example, if the user goes offline), you will be charged for reads as if you had issued a brand-new query.
Managing large result sets
Firestore has several features to help you manage queries that return a large number of results:
- Cursors, which allow you to resume a long-running query.
- Page tokens, which help you paginate the query results.
- Limits, which specify how many results to retrieve.
- Offsets, which allow you to skip a fixed number of documents.
There are no additional costs for using cursors, page tokens, and limits. In fact, these features can help you save money by reading only the documents that you actually need.
However, when you send a query that includes an offset, you are charged a read for each skipped document. For example, if your query uses an offset of 10, and the query returns 1 document, you are charged for 11 reads. Because of this additional cost, you should use cursors instead of offsets whenever possible.
Queries other than document reads
For queries other than document reads, such as a request for a list of collection IDs, you are billed for one document read. If fetching the complete set of results requires more than one request (for example, if you are using pagination), you are billed once per request.
Minimum charge for queries
There is a minimum charge of one document read for each query that you perform, even if the query returns no results.
Firestore Security Rules
For mobile and web client libraries, if your
Firestore Security Rules use exists(), get(), or getAfter() to read
one or more documents from your database, you are charged for additional reads
as follows:
You are charged for reads that are necessary to evaluate your Firestore Security Rules.
For example, if your rules refer to three documents, but Firestore only has to read two of those documents to evaluate your rules, you will be charged for two additional reads for the dependent documents.
You are only charged one read per dependent document even if your rules refer to that document more than once.
You are charged for rule evaluation only once per request.
As a result, it can cost less to read multiple documents than to read documents one at a time, because reading multiple documents requires fewer requests.
When you listen to the results of a query, you are charged for rule evaluation in all of the following cases:
- When you issue the query.
- Each time the query results are updated.
- Any time the user's device goes offline, then comes back online.
- Any time you update your rules.
- Any time you update the dependent documents in your rules.
Storage size
You are charged for the amount of data that you store in Firestore, including storage overhead. The amount of overhead includes metadata, automatic indexes, and composite indexes. Each document stored in Firestore requires the following metadata:
- The document ID, including the collection ID and the document name.
- The name and value of each field. Because Firestore is schemaless, the name of each field in a document must be stored with the field value.
- Any single-field and composite indexes that refer to the document. Each index entry contains the collection ID; any number of field values, depending on the index definition; and the document name.
Learn how Firestore storage is calculated at Storage Size Calculations. You can view the amount of storage that your database uses by visiting the App Engine Quota Details page in the Cloud Console.
Network bandwidth
You are charged for the network bandwidth used by your Firestore requests, as shown in the following sections. The network bandwidth cost of a Firestore request depends on the request’s response size, the location of your Firestore database, and the destination of the response.
Firestore calculates response size based on a serialized message format. Protocol overhead, such as SSL overhead, does not count towards network bandwidth usage. Requests denied by your Firestore Security Rules do not count towards network bandwidth usage.
To learn how much network bandwidth you have used, you can use the Cloud Console to export your billing data to a file.
General network pricing
For requests that originate within Google Cloud Platform (for example, from an application running on Google Compute Engine), you are charged as follows:
| Traffic type | Price |
|---|---|
| Ingress | Free |
| Egress within a region | Free |
| Egress between regions in the same multi-region | Free |
| Egress between regions within the US (per GiB) | $0.01 (first 10 GiB per month are free) |
| Egress between regions, not including traffic between US regions | Google Cloud Platform internet egress rates |
If you pay in a currency other than USD, the prices listed in your currency on Cloud Platform SKUs apply.
Internet egress rates
You will be charged for internet egress for the following:
- Google Cloud requests between regions, not including traffic between US regions
- Requests from outside of Google Cloud (for example, from a user's mobile device)
Monitoring usage
You can view your daily Firestore usage in the App Engine Quotas page:
Managing spending
To manage your spending, set monthly budgets and alerts.
Google Cloud budgets and alerts
Google Cloud allows you to set a monthly budget for all Google Cloud services. Use a monthly budget to monitor your overall Google Cloud costs, including your network bandwidth costs for Firestore. After you set a budget, you can set alerts, which cause you to receive email notifications as your costs grow closer to your budget.
Costs that count towards your App Engine spending limit also count towards your monthly budget.
Follow these instructions to set a monthly budget and create alerts in the Cloud Console.
App Engine spending limit
App Engine allows you to set a daily spending limit on App Engine and its associated resources, which include Datastore and Firestore databases. The limit is approximate and should be large enough to handle spikes in resource usage. After you exceed the daily spending limit, all Firestore operations that are not within your free quota will fail.
Pricing example
To see how Firestore billing costs accrue in a real-world sample app, see the Firestore billing example.