{"slug":"unit-codes","listId":"UNECE Rec 20/21","listName":"Unit of measure codes (common)","description":"UNECE Recommendation 20 codes for invoiced quantities (BT-130) and price base quantities (BT-150), such as piece, hour and kilogram.","scopeNote":"Units that appear most often on invoices. The allowed list combines Recommendation 20 and the X-prefixed package codes of Recommendation 21; PCE and PCS are not in it.","officialSource":{"label":"UNECE Recommendation 20/21 unit codes","url":"https://unece.org/trade/uncefact"},"dateModified":"2026-09-14","items":[{"code":"C62","label":"One","notes":"The most common code for counted items and flat-rate positions in XRechnung practice (“one”). Invoice Converter writes C62 for ERP units such as Stk, Stück, PCE, PCS, EA or PC. Keep BT-130 and BT-150 consistent."},{"code":"H87","label":"Piece","notes":"Semantically the more specific code for counted items (“piece”). Use it when the recipient asks for H87. PCE and PCS are not valid unit codes and fail BR-CL-23, so map them to C62 or H87 before export."},{"code":"EA","label":"Each","notes":"A valid code (“each”), but less common than C62. Agree with the buyer which of C62, H87 or EA it expects, and use the same code on every line."},{"code":"XPP","label":"Piece (package type)","notes":"Recommendation 21 package code with the X prefix: one piece as a packaging unit (an unpacked single item). Use it only if the buyer bills by package type; ordinary item counts use C62 or H87."},{"code":"HUR","label":"Hour","notes":"Services billed by time. The hourly rate is the net price (BT-146) per HUR."},{"code":"MIN","label":"Minute","notes":"Short time units, for example telephone or support minutes."},{"code":"SEC","label":"Second","notes":"Usage-based billing in seconds, for example call or compute time."},{"code":"DAY","label":"Day","notes":"Day rates, for example equipment rental or consulting days."},{"code":"WEE","label":"Week","notes":"Weekly rates; state the covered period in the invoicing period (BG-14 or BG-26)."},{"code":"MON","label":"Month","notes":"Monthly subscriptions and rent; state the service month in the invoicing period (BG-14 or BG-26)."},{"code":"ANN","label":"Year","notes":"Annual licences and maintenance contracts; state the contract year in the invoicing period."},{"code":"MMT","label":"Millimetre","notes":"Length in millimetres, for example cut-to-size material."},{"code":"CMT","label":"Centimetre","notes":"Length in centimetres."},{"code":"MTR","label":"Metre","notes":"Length in metres, for example cables, pipes or fabric."},{"code":"KMT","label":"Kilometre","notes":"Distance-based charges, for example transport or travel kilometres."},{"code":"MTK","label":"Square metre","notes":"Area, for example flooring, cleaning or rented space."},{"code":"MTQ","label":"Cubic metre","notes":"Volume, for example concrete, water or gas."},{"code":"GRM","label":"Gram","notes":"Mass in grams, for example precious metals or laboratory material."},{"code":"KGM","label":"Kilogram","notes":"The most common mass unit on invoices. If the price is per 100 kg, set the price base quantity (BT-149) to 100."},{"code":"TNE","label":"Tonne (metric ton)","notes":"Metric tonne of 1,000 kg, for example bulk goods or waste. Not the US short ton (STN)."},{"code":"LTR","label":"Litre","notes":"Volume in litres, for example fuel, oils or beverages."}]}