Usage and limits

Use this guide to understand Cloud Firestore limits, and see Cloud Firestore Pricing for a full, detailed explanation of Cloud Firestore costs, including things to watch out for.

Monitor your usage

To monitor your Cloud Firestore usage, open the Cloud Firestore Usage tab in the Firebase console. Use the dashboard to gauge your usage over different time periods.

Note: As a result of how the dashboard computes usage, the numbers reported can differ slightly from billing reports. The billing reports are the final usage numbers.

Detailed usage in the Google Cloud Console

When you create a Firebase project, you're also creating a Google Cloud project. The Cloud Firestore API Quotas and App Engine Quotas pages in the Google Cloud Console track Cloud Firestore usage and quota information.

Free quota

Cloud Firestore offers free quota that allows you to get started at no cost. The free quota amounts are listed below. If you need more quota, you must enable billing for your Cloud Platform project.

Quotas are applied daily and reset around midnight Pacific time.

Free tier	Quota
Stored data	1 GiB
Document reads	50,000 per day
Document writes	20,000 per day
Document deletes	20,000 per day
Network egress	10 GiB per month

Standard limits

The following tables show the limits that apply to Cloud Firestore. These are hard limits unless otherwise noted.

Collections, documents, and fields

Limit	Details
Constraints on collection IDs	Must be valid UTF-8 characters Must be no longer than 1,500 bytes Cannot contain a forward slash (/) Cannot solely consist of a single period (.) or double periods (..) Cannot match the regular expression __.*__
Maximum depth of subcollections	100
Constraints on document IDs	Must be valid UTF-8 characters Must be no longer than 1,500 bytes Cannot contain a forward slash (/) Cannot solely consist of a single period (.) or double periods (..) Cannot match the regular expression __.*__ If you import Datastore entities into a Firestore database, numeric entity IDs are exposed as __id[0-9]+__
Maximum size for a document name	6 KiB
Maximum size for a document	1 MiB (1,048,576 bytes)
Constraints on field names	Must be valid UTF-8 characters
Maximum size of a field name	1,500 bytes
Constraints on field paths	Must separate field names with a single period (.) May be passed as a string when all field names in the path are simple, otherwise must be passed as a FieldPath object (e.g. JavaScript FieldPath) A simple field name is one where all of the following are true: Contains only the characters a-z, A-Z, 0-9, and underscore (_) Does not start with 0-9
Maximum size of a field path	1,500 bytes
Maximum size of a field value	1 MiB - 89 bytes (1,048,487 bytes)
Maximum depth of fields in a map or array	20

Writes and transactions

In addition to these limits, you should also see the best practices for designing for scale.

Limit	Details
Maximum API request size	10 MiB
Maximum number of field transformations that can be performed on a single document in a Commit operation or in a transaction	500
Time limit for a transaction	270 seconds, with a 60-second idle expiration time

Soft limits

Cloud Firestore does not stop you from exceeding the thresholds below, but doing so affects performance.

Soft limit	Details
Maximum write rate to a collection in which documents contain sequential values in an indexed field	500 per second

Indexes

The following limits apply to single-field indexes and composite indexes:

Limit	Details
Maximum number of composite indexes for a database	200 You can contact support to request an increase to this limit.
Maximum number of single-field configurations for a database	200 A total of 200 field level configurations are allowed. One field configuration can contain multiple configurations for the same field. For example, a single-field indexing exemption and a TTL policy on the same field count as one field configuration towards the limit.
Maximum number of index entries for each document	40,000 The number of index entries is the sum of the following for a document: The number of single-field index entries The number of composite index entries To see how Cloud Firestore turns a document and a set of indexes into index entries, see this index entry count example.
Maximum number of fields in a composite index	100
Maximum size of an index entry	7.5 KiB To see how Cloud Firestore calculates index entry size, see index entry size.
Maximum sum of the sizes of a document's index entries	8 MiB The total size is the sum of the following for a document: The sum of the size of a document's single-field index entries The sum of the size of a document's composite index entries
Maximum size of an indexed field value	1500 bytes Field values over 1500 bytes are truncated. Queries involving truncated field values may return inconsistent results.

Time-to-live (TTL)

Limit	Details
Maximum number of single-field configurations for a database	200 A total of 200 field level configurations are allowed. One field configuration can contain multiple configurations for the same field. For example, a single-field indexing exemption and a TTL policy on the same field count as one field configuration towards the limit.

Export/Import

The following limits apply to managed import and export operations:

Limit	Details
Maximum total number of both export and import requests for a project allowed per minute	20
Maximum number of concurrent exports and imports	50
Maximum number of collection ID filters for export and import requests	100

Security rules

Limit	Details
Maximum number of exists(), get(), and getAfter() calls per request	10 for single-document requests and query requests. 20 for multi-document reads, transactions, and batched writes. The previous limit of 10 also applies to each operation. For example, imagine you create a batched write request with 3 write operations and that your security rules use 2 document access calls to validate each write. In this case, each write uses 2 of its 10 access calls and the batched write request uses 6 of its 20 access calls. Exceeding either limit results in a permission denied error. Some document access calls may be cached, and cached calls do not count towards the limits.
Maximum nested match statement depth	10
Maximum path length, in path segments, allowed within a set of nested match statements	100
Maximum number of path capture variables allowed within a set of nested match statements	20
Maximum function call depth	20
Maximum number of function arguments	7
Maximum number of let variable bindings per function	10
Maximum number of recursive or cyclical function calls	0 (not permitted)
Maximum number of expressions evaluated per request	1,000
Maximum size of a ruleset	Rulesets must obey two size limits: a 256 KB limit on the size of the ruleset text source published from the Firebase console or from the CLI using firebase deploy. a 250 KB limit on the size of the compiled ruleset that results when Firebase processes the source and makes it active on the back-end.

Manage spending

To help avoid unexpected charges on your bill, set monthly budgets and alerts.

Set a monthly budget

To track your Cloud Firestore costs, create a monthly budget in the Google Cloud Console. Budgets won't limit your usage, but you can set alerts to notify you when you're approaching or exceeding your planned costs for the month.

To set a budget, go to the Billing section in the Google Cloud Console and create a budget for your Cloud Billing account. You can use the default alert settings or modify the alerts to send notifications at different percentages of your monthly budget.

Learn more about setting up budgets and budget alerts.

Set a daily spending limit

Important: Cloud Firestore no longer supports new App Engine spending limits. After December 12, 2019, you cannot apply new App Engine spending limits. Spending limits set before December 12 still apply.

To cap your Cloud Firestore usage, set a daily spending limit through App Engine. App Engine allows you to set a daily spending limit on App Engine associated resources, including Cloud Firestore. The App Engine limit does not apply to any other Firebase products.