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Overview Why UnifyUnits Quickstart Playground Pricing Authentication

Account

Profile API keys Usage & billing

Conversion

Single conversion Batch conversion Precision & values Normalize Currency Substances Unit price Locale formatting

Units

Categories & units Unit identifiers Aliases

API reference

Overview GET /v1/convert POST /v1/convert POST /v1/batch POST /v1/parse POST /v1/normalize POST /v1/currency/convert GET /v1/currency/rates GET /v1/substances POST /v1/substance/convert POST /v1/unit-price GET /v1/categories GET /v1/categories/:id GET /v1/units GET /v1/units/:id GET /v1/health GET /openapi.json Errors

Usage & limits

Guides

cURL JavaScript / TypeScript Python PHP MCP server

Platform

Security Versioning Changelog Troubleshooting Support Operator

Account

Manage your profile, API key and plan for the Measurement API.

Profile API keys Usage & billing

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Free plan includes 10,000 conversions per month, 100 requests per 60 seconds, and batch conversion up to 100 items. One active key per Google account.

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UnifyUnits Measurement API

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