> ## Documentation Index > Fetch the complete documentation index at: https://skulabs.mintlify.site/llms.txt > Use this file to discover all available pages before exploring further. # Inventory - Calculate Free Map > Calculate available inventory by subtracting reserved quantities from on-hand stock. ## OpenAPI ````yaml post /inventory/calculate_free_map openapi: 3.0.3 info: title: SKULabs API description: >- Most API keys have "platformGeneric" and "platformApi" scopes included. Contact us to convert more routes from "platformUser" (only available to users) to "platformGeneric" (available to users and api keys) upon request. version: 4.5.0 servers: - url: https://api.skulabs.com - url: https://app.skulabs.com/s security: [] tags: - name: batch - name: customer description: Manage customers, tags, and notes - name: cycle_count - name: distributor - name: inventory description: Query and modify inventory levels across locations - name: inventory_table - name: item description: Manage items, barcodes, serial numbers, and tags - name: kit description: Manage kits and their component items - name: listing - name: location - name: oauth - name: order description: Manage orders, shipments, tags, and statuses - name: purchase_order description: Manage purchase orders and receiving - name: run - name: shipments - name: shipping - name: store - name: tag description: Create, update, and remove tags - name: transfer_order - name: warehouse description: Manage warehouses and view statistics - name: webhook description: Manage webhook handlers paths: /inventory/calculate_free_map: post: tags: - inventory summary: Inventory - Calculate Free Map description: >- Calculate available inventory by subtracting reserved quantities from on-hand stock. operationId: post_inventory_calculate_free_map requestBody: required: true content: application/json: schema: type: object properties: items_ids: type: array items: type: string description: Array of item IDs warehouse_ids: type: array items: type: string description: Filter by warehouse IDs required: - items_ids responses: '200': description: >- Map of item IDs to free inventory quantities. When warehouse_linked_reserves is enabled, returns nested map by warehouse_id then item_id. content: application/json: schema: type: object additionalProperties: anyOf: - $ref: '#/components/schemas/FreeInventoryEntry' - type: object additionalProperties: $ref: '#/components/schemas/FreeInventoryEntry' '400': description: Bad request content: application/json: schema: type: object properties: error: type: object properties: message: type: string description: Detailed error message code: type: string description: Machine-readable error code overview: type: string description: Short human-friendly description statusCode: type: number description: HTTP status code origin: type: string description: Error source skulabsTraceId: type: string description: Trace ID for support type: type: string enum: - error - notice - success description: Error severity for UI handling user_error: type: boolean description: Whether the error was caused by user input display: type: string enum: - notification - panel description: Suggested UI display mode for the error required: - message - statusCode required: - error '401': description: Unauthorized content: application/json: schema: type: object properties: error: type: object properties: message: type: string description: Detailed error message code: type: string description: Machine-readable error code overview: type: string description: Short human-friendly description statusCode: type: number description: HTTP status code origin: type: string description: Error source skulabsTraceId: type: string description: Trace ID for support type: type: string enum: - error - notice - success description: Error severity for UI handling user_error: type: boolean description: Whether the error was caused by user input display: type: string enum: - notification - panel description: Suggested UI display mode for the error required: - message - statusCode required: - error '403': description: Forbidden. Insufficient permissions. content: application/json: schema: type: object properties: error: type: object properties: message: type: string description: Detailed error message code: type: string description: Machine-readable error code overview: type: string description: Short human-friendly description statusCode: type: number description: HTTP status code origin: type: string description: Error source skulabsTraceId: type: string description: Trace ID for support type: type: string enum: - error - notice - success description: Error severity for UI handling user_error: type: boolean description: Whether the error was caused by user input display: type: string enum: - notification - panel description: Suggested UI display mode for the error required: - message - statusCode required: - error '429': description: Too many requests. Rate limit exceeded. content: application/json: schema: type: object properties: error: type: object properties: message: type: string description: Detailed error message code: type: string description: Machine-readable error code overview: type: string description: Short human-friendly description statusCode: type: number description: HTTP status code origin: type: string description: Error source skulabsTraceId: type: string description: Trace ID for support type: type: string enum: - error - notice - success description: Error severity for UI handling user_error: type: boolean description: Whether the error was caused by user input display: type: string enum: - notification - panel description: Suggested UI display mode for the error required: - message - statusCode required: - error '500': description: Internal server error. content: application/json: schema: type: object properties: error: type: object properties: message: type: string description: Detailed error message code: type: string description: Machine-readable error code overview: type: string description: Short human-friendly description statusCode: type: number description: HTTP status code origin: type: string description: Error source skulabsTraceId: type: string description: Trace ID for support type: type: string enum: - error - notice - success description: Error severity for UI handling user_error: type: boolean description: Whether the error was caused by user input display: type: string enum: - notification - panel description: Suggested UI display mode for the error required: - message - statusCode required: - error security: - SKULabsToken: [] servers: - url: https://api.skulabs.com components: schemas: FreeInventoryEntry: type: object properties: on_hand: type: number description: Total on-hand quantity reserved: type: number description: Reserved quantity free: type: number description: Free (available) quantity required: - on_hand - reserved - free securitySchemes: SKULabsToken: type: http scheme: bearer bearerFormat: JWT ````