#measurement

The UN/ECE Recommendation 20 unit-of-measure codes — the codes used to identify units of measure in trade documents, invoices and EDI messages — as an API. The reference a customs, ERP or e-invoicing system needs. Each unit (for example KGM = kilogram, MTR = metre, LTR = litre, C62 = one/each, TNE = tonne, MTK = square metre) carries a 2–3 character common code, a name, the unit symbol, a description and a status (active or deprecated). Look a code up, reverse-look-up the code(s) for a symbol (kg → KGM), search by name or symbol, or list every code filtered by status. This is the unit-of-measure CODE register — distinct from unit-api, which performs unit-conversion maths. Served from memory — always fast.

api.oanor.com/unitcodes-api

Schnelle, deterministische Einheitenumrechnung in 10 Kategorien – Länge, Masse, Temperatur, Fläche, Volumen, Geschwindigkeit, Zeit, digitale Speicher, Druck und Energie. Konvertieren Sie jeden Wert zwischen kompatiblen Einheiten und listen Sie den vollständigen Einheitenkatalog pro Kategorie auf. Vollständig lokale Berechnung (keine Drittanbieter-Upstream), daher sind Antworten sofort und immer verfügbar. Ideal für Taschenrechner, E-Commerce, Logistik, technische Werkzeuge, Dashboards und Chatbots.

api.oanor.com/unit-api