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# GraphQL query complexity estimator

Parse a GraphQL operation with fragments and estimate depth, alias count, and weighted cost against limits you set.

Paste an operation to estimate its cost.

The cost model here is a convention, not a GraphQL standard. Each field costs its weight, and every list multiplies the work under it: cost = weight + list size x the cost of the subselection, and the total is the sum over root fields. List sizes come from a first, last, limit, count, or take argument resolved through your variables, then a Type.field[] rule, then the assumed list size. Paste the schema SDL when you can: with it, lists and leaves come from the schema and every field is checked against its type; without it, a field counts as a list only when an argument or rule sizes it. Unions are costed once through their typed fragments, not once per member. This is a static estimate of what the operation asks for; it does not know your resolvers, and no server was contacted.
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## More regex & cron tools

- [JSON schema validator](/json/schema)
- [JSON query](/json/query)
- [Pagination fixture builder](/data/api-pagination-test-data-builder)
[All regex & cron tools](/dev)

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