Craft Quantities (craftquantities.com) publishes 1,165 construction calculators that show the formula and cited standard (ACI, IRC, NEC, IPC, ASHRAE, Eurocode, AS/NZS, BS) behind every number, along with trade guides, reference tables, job takeoffs and a workspace that exports a priced bill of materials. Its calculator data is offered as free static JSON under CC BY 4.0 with no key, quota or rate limit, and the same calculators are computed on request through an executable API at api.craftquantities.com/v1 and an MCP server for AI assistants.
Craft Quantities publishes 15 API contracts indexed on the APIs.io network, including Agent tools API, Benchmark API, Calculators API, and 12 more. Tagged areas include Company, Construction, Calculators, Estimating, and Building Materials.
The Craft Quantities catalog on APIs.io includes 1 Spectral governance ruleset.
Craft Quantities’ developer surface includes changelog, authentication, documentation, support, and 34 more developer resources.
Regulatory Posture applies to this provider. Its tags matched the
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applicability map is public and we will correct it.
Create-or-Update Ergonomics applies to this provider. This API accepts writes, so it
carries 10 points of the composite. It is scored from the published contracts
themselves: whether a caller can create-or-update in one call, whether the write accepts a key the caller already
holds, and whether the response says which branch ran. Without that, every write needs a search-and-branch in
front of it, and the first time that check is skipped a duplicate record is created.
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Agent readiness — checks not met, largest first (exact, from this profile):
Idempotency+9 pts — OpenAPI mutating operations declare an idempotency key — a header, a request-body property, or a named de-duplication token whose own description says so (verified); else common[].type matches /idempoten/i (documented) Ask about this →
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Protected Resource Metadata+5 pts — a served /.well-known/oauth-protected-resource carrying `resource` (documented), and naming its authorization_servers (verified) Ask about this →
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Standards this provider implements or carries. De facto ones are profiled and measured by the API Commons; formal ones come from the standards directory and are linked by the provider's own tags. The evidence column says how each claim was established — not that it was made.
Free static JSON files (CC BY 4.0, no key) describing every calculator input, bound, unit and test vector, plus takeoffs, standards, glossary and corrections ledger.
Corner trim on the reader's saw, a room's trim plan, the scribe template and the other full-size templates, a panel or worktop fitted to walls that are not square, and the mitre...
The House Estimator and the Construction Canvas: a drawn house and everything it is built from, a sketch measured from its points, a drawing as DXF and SVG, and a reinforcement ...
Engine computations per address: each address may run 60 calculations, takeoffs, plans, drawings or project updates (a batch of up to 25 calculations cou
Engine look-ups per address: 300 look-ups a minute
Batch size: a batch of up to 25 calculations counts as one
Overlays applied on top of this provider's contracts. Each card says who wrote it: a document the provider publishes, or one API Evangelist derived or generated.
aid: craftquantities-com
name: Craft Quantities
description: Craft Quantities (craftquantities.com) publishes 1,165 construction calculators that show the formula and cited
standard (ACI, IRC, NEC, IPC, ASHRAE, Eurocode, AS/NZS, BS) behind every number, along with trade guides, reference tables,
job takeoffs and a workspace that exports a priced bill of materials. Its calculator data is offered as free static JSON
under CC BY 4.0 with no key, quota or rate limit, and the same calculators are computed on request through an executable
API at api.craftquantities.com/v1 and an MCP server for AI assistants.
url: https://artifacts.apis.io/craftquantities-com/apis.yml
x-type: company
x-source: harvest:mcp-registry
x-tier: profiled
x-tier-reason: enrichment pass 2026-11-04 (modular-v1; was harvest)
accessModel:
pricing: free
onboarding: unknown
trial: false
try_now: false
public: false
label: Free
confidence: high
probe_state: covered
source:
- plans
- authentication
- rate-limits
- security
generated: '2026-11-13'
method: derived
specificationVersion: '0.20'
created: '2026-11-04'
modified: '2026-11-04'
tags:
- Company
- Construction
- Calculators
- Estimating
- Building Materials
- Open Data
- MCP
maintainers:
- FN: Kin Lane
email: kin@apievangelist.com
- FN: APIs.json
email: info@apis.io
image: https://craftquantities.com/og/default.png
common:
- type: AgenticAccess
url: agentic-access/craftquantities-com-agentic-access.yml
- type: RateLimits
url: rate-limits/craftquantities-com-rate-limits.yml
- type: Plans
url: plans/craftquantities-com-plans-pricing.yml
- type: Spectral
url: rules/craftquantities-com-rules.yml
- type: Vocabulary
url: vocabulary/craftquantities-com-vocabulary.yml
- type: AgentSkill
url: skills/_index.yml
- type: Components
url: components/craftquantities-com-components.yml
- type: ChangeLog
url: changelog/craftquantities-com-changelog.yml
- type: Conventions
url: conventions/craftquantities-com-conventions.yml
- type: Security
url: security/craftquantities-com-vulnerability-disclosure.yml
- type: Authentication
url: authentication/craftquantities-com-authentication.yml
- type: Deprecation
url: lifecycle/craftquantities-com-lifecycle.yml
- type: Lifecycle
url: lifecycle/craftquantities-com-lifecycle.yml
- type: ErrorCatalog
url: errors/craftquantities-com-problem-types.yml
- type: Conformance
url: conformance/craftquantities-com-conformance.yml
- type: Overlay
url: overlays/craftquantities-com-engine-overlay.yaml
- type: LLMsTxt
url: llms/craftquantities-com-llms.txt
- type: AgentCard
url: a2a/craftquantities-com-a2a.yml
- type: ToolCrosswalk
url: mcp/craftquantities-com-tool-crosswalk.yml
- type: MCPServer
url: mcp/craftquantities-com-mcp.yml
- type: SecurityTxt
url: well-known/craftquantities-com-security.txt
- type: WellKnown
url: well-known/craftquantities-com-well-known.yml
- type: Hosts
url: hosts/craftquantities-com-hosts.yml
- type: Vendors
url: vendors/craftquantities-com-vendors.yml
- type: Website
url: https://craftquantities.com/
- type: VulnerabilityDisclosure
url: security/craftquantities-com-vulnerability-disclosure.yml
- type: DomainSecurity
url: security/craftquantities-com-domain-security.yml
- type: DeveloperPortal
url: https://craftquantities.com/api/
- type: Documentation
url: https://craftquantities.com/api/
- type: Support
url: https://craftquantities.com/contact/
- type: TermsOfService
url: https://craftquantities.com/terms/
- type: PrivacyPolicy
url: https://craftquantities.com/privacy-policy/
- type: LLMs
url: https://craftquantities.com/llms.txt
- type: UsageTerms
url: terms/craftquantities-com-terms-of-service.yml
- type: DataProcessing
url: privacy/craftquantities-com-privacy-policy.yml
- type: Eligibility
url: eligibility/craftquantities-com-eligibility.yml
- type: AIPreferences
url: ai-preferences/craftquantities-com-ai-preferences.yml
- type: DataLicense
url: data-license/craftquantities-com-data-license.yml
apis:
- aid: craftquantities-com:craft-quantities-static-data-api
name: Craft Quantities Static Data API
description: Free static JSON files (CC BY 4.0, no key) describing every calculator input, bound, unit and test vector,
plus takeoffs, standards, glossary and corrections ledger.
humanURL: https://craftquantities.com/api/
baseURL: https://craftquantities.com/api/v1
tags:
- Construction
- Open Data
properties: []
- aid: craftquantities-com:craftquantities-com-agent-tools-api
name: Craft Quantities Agent tools API
description: Many calculations in one request, a project changed through its state token, a list grouped by MasterFormat
division, and permanent ids.
humanURL: https://craftquantities.com/api/
baseURL: https://api.craftquantities.com/v1
tags:
- Agent Tools
tags_raw:
- Agent tools
properties:
- type: OpenAPI
url: openapi/craftquantities-com-agent-tools-api-openapi.yml
- type: JSONSchema
url: json-schema/craftquantities-com-calculate-result-schema.json
- aid: craftquantities-com:craftquantities-com-benchmark-api
name: Craft Quantities Benchmark API
description: 'The Construction Quantities Benchmark: the calculators'' test vectors as questions in both unit systems, with
their answers, CC BY 4.0.'
humanURL: https://craftquantities.com/api/
baseURL: https://api.craftquantities.com/v1
tags:
- Benchmarks
tags_raw:
- Benchmark
properties:
- type: OpenAPI
url: openapi/craftquantities-com-benchmark-api-openapi.yml
- type: JSONSchema
url: json-schema/craftquantities-com-calculate-result-schema.json
- aid: craftquantities-com:craftquantities-com-calculators-api
name: Craft Quantities Calculators API
description: 'One calculator: what it asks, its answer in both systems, its sources and a link to its page.'
humanURL: https://craftquantities.com/api/
baseURL: https://api.craftquantities.com/v1
tags:
- Calculators
properties:
- type: OpenAPI
url: openapi/craftquantities-com-calculators-api-openapi.yml
- type: JSONSchema
url: json-schema/craftquantities-com-calculate-result-schema.json
- aid: craftquantities-com:craftquantities-com-cutting-api
name: Craft Quantities Cutting API
description: 'Corner trim on the reader''s saw, a room''s trim plan, the scribe template and the other full-size templates,
a panel or worktop fitted to walls that are not square, and the mitre saw chart: cutting geometry and quantities, never
sized.'
humanURL: https://craftquantities.com/api/
baseURL: https://api.craftquantities.com/v1
tags:
- Cutting
properties:
- type: OpenAPI
url: openapi/craftquantities-com-cutting-api-openapi.yml
- type: JSONSchema
url: json-schema/craftquantities-com-calculate-result-schema.json
- aid: craftquantities-com:craftquantities-com-diagnoses-and-documents-api
name: Craft Quantities Diagnoses and documents API
description: Faults by symptom, the documents each market uses, and trade words across markets.
humanURL: https://craftquantities.com/api/
baseURL: https://api.craftquantities.com/v1
tags:
- Diagnoses and documents
properties:
- type: OpenAPI
url: openapi/craftquantities-com-diagnoses-and-documents-api-openapi.yml
- type: JSONSchema
url: json-schema/craftquantities-com-calculate-result-schema.json
- aid: craftquantities-com:craftquantities-com-discovery-api
name: Craft Quantities Discovery API
description: Find a calculator, takeoff or worked example by what the job is.
humanURL: https://craftquantities.com/api/
baseURL: https://api.craftquantities.com/v1
tags:
- Discovery
properties:
- type: OpenAPI
url: openapi/craftquantities-com-discovery-api-openapi.yml
- type: JSONSchema
url: json-schema/craftquantities-com-calculate-result-schema.json
- aid: craftquantities-com:craftquantities-com-house-and-canvas-api
name: Craft Quantities House and canvas API
description: 'The House Estimator and the Construction Canvas: a drawn house and everything it is built from, a sketch measured
from its points, a drawing as DXF and SVG, and a reinforcement layout.'
humanURL: https://craftquantities.com/api/
baseURL: https://api.craftquantities.com/v1
tags:
- House and canvas
properties:
- type: OpenAPI
url: openapi/craftquantities-com-house-and-canvas-api-openapi.yml
- type: JSONSchema
url: json-schema/craftquantities-com-calculate-result-schema.json
- aid: craftquantities-com:craftquantities-com-planner-api
name: Craft Quantities Planner API
description: 'The room-by-room planner: one space, or several and a roof.'
humanURL: https://craftquantities.com/api/
baseURL: https://api.craftquantities.com/v1
tags:
- Planner
properties:
- type: OpenAPI
url: openapi/craftquantities-com-planner-api-openapi.yml
- type: JSONSchema
url: json-schema/craftquantities-com-calculate-result-schema.json
- aid: craftquantities-com:craftquantities-com-project-files-api
name: Craft Quantities Project files API
description: A My Project file the reader restores on the site. Nothing is stored.
humanURL: https://craftquantities.com/api/
baseURL: https://api.craftquantities.com/v1
tags:
- Project files
properties:
- type: OpenAPI
url: openapi/craftquantities-com-project-files-api-openapi.yml
- type: JSONSchema
url: json-schema/craftquantities-com-calculate-result-schema.json
- aid: craftquantities-com:craftquantities-com-quotes-api
name: Craft Quantities Quotes API
description: A contractor's quote read against the job; the reader's own quote turned into a project.
humanURL: https://craftquantities.com/api/
baseURL: https://api.craftquantities.com/v1
tags:
- Quotes
properties:
- type: OpenAPI
url: openapi/craftquantities-com-quotes-api-openapi.yml
- type: JSONSchema
url: json-schema/craftquantities-com-calculate-result-schema.json
- aid: craftquantities-com:craftquantities-com-solve-backwards-api
name: Craft Quantities Solve backwards API
description: What the material the reader already has will cover, as the site's Solve Backwards pages work it.
humanURL: https://craftquantities.com/api/
baseURL: https://api.craftquantities.com/v1
tags:
- Solve backwards
properties:
- type: OpenAPI
url: openapi/craftquantities-com-solve-backwards-api-openapi.yml
- type: JSONSchema
url: json-schema/craftquantities-com-calculate-result-schema.json
- aid: craftquantities-com:craftquantities-com-takeoffs-api
name: Craft Quantities Takeoffs API
description: A whole job worked row by row, as its takeoff page works it.
humanURL: https://craftquantities.com/api/
baseURL: https://api.craftquantities.com/v1
tags:
- Takeoffs
properties:
- type: OpenAPI
url: openapi/craftquantities-com-takeoffs-api-openapi.yml
- type: JSONSchema
url: json-schema/craftquantities-com-calculate-result-schema.json
- aid: craftquantities-com:craftquantities-com-units-api
name: Craft Quantities Units API
description: Conversions by the exact factors the calculators use.
humanURL: https://craftquantities.com/api/
baseURL: https://api.craftquantities.com/v1
tags:
- Units
properties:
- type: OpenAPI
url: openapi/craftquantities-com-units-api-openapi.yml
- type: JSONSchema
url: json-schema/craftquantities-com-calculate-result-schema.json
- aid: craftquantities-com:craftquantities-com-worked-examples-api
name: Craft Quantities Worked examples API
description: The site's published examples, re-run now against their pinned figures.
humanURL: https://craftquantities.com/api/
baseURL: https://api.craftquantities.com/v1
tags:
- Worked examples
properties:
- type: OpenAPI
url: openapi/craftquantities-com-worked-examples-api-openapi.yml
- type: JSONSchema
url: json-schema/craftquantities-com-calculate-result-schema.json
x-coverage:
state: covered
reason: identity-verified
detail: Name, description and pointers read from craftquantities.com pages (title "Craft Quantities", /api/, /about/).
evidence:
- url: https://craftquantities.com/
status: 200
- url: https://craftquantities.com/api/
status: 200
- url: https://api.craftquantities.com/
status: 200
x-enrichment:
date: '2026-11-04'
status: enriched
artifacts_added: 82
pass: modular-v1
engine: identity=anthropic,contract=anthropic,surfaces=anthropic,docs=anthropic,regulatory=anthropic
Craft Quantities API — frequently asked questions
Does Craft Quantities have an API?
Yes. APIs.io lists 15 APIs from Craft Quantities, including Craft Quantities Static Data API, Craft Quantities Agent tools API and Craft Quantities Benchmark API, and 12 more.
Is there an OpenAPI specification for the Craft Quantities API?
Yes. APIs.io indexes 14 OpenAPI specifications for Craft Quantities, each linked for download from this page.
How do I authenticate with the Craft Quantities API?
Craft Quantities uses bearer-token authentication (1 scheme). The details are profiled on APIs.io as Craft Quantities Authentication.
How much does the Craft Quantities API cost?
Craft Quantities publishes its prices; its Free plan is There is no key and no charge. as of 2026-11-04. APIs.io lists 1 pricing plan for Craft Quantities, with each plan's price, limits and inclusions under Pricing on this page.
Does Craft Quantities have an MCP server?
Yes. APIs.io lists 1 MCP server for Craft Quantities: Remote MCP server at api.craftquantities.com; 56 tools listed.
Is the Craft Quantities API ready for AI agents?
Craft Quantities has a Kin Score of 51.0 out of 100 (developing) and an Agent Readiness score of 41.9 (agent-ready), scored by API Evangelist on 2026-11-13.
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