{{short description|System of units traditionally used in Thailand}} Before metrication, the traditional system of measurement used in Thailand employed anthropic units. Some of these units are still in use, albeit standardised to SI/metric measurements. When the Royal Thai Survey Department began cadastral survey in 1896, Director R. W. Giblin, F.R.G.S., noted, "It so happens that 40 metres or 4,000 centimetres are equal to one ''sen''," so all cadastral plans are plotted, drawn, and printed to a scale of 1:4,000.<ref name=Giblin>{{cite book |title=Twentieth century impressions of Siam |last=Giblin|first= R. W. |editor1-last= Wright |editor1-first= Arnold |editor2-last= Breakspear |editor2-first= Oliver T |year= 2008 |orig-year=1908 |publisher= Lloyds Greater Britain Publishing Company |location= London&c |page= 126 |chapter= Royal Survey Work. |chapter-url= http://www.ebooksread.com/authors-eng/arnold-wright/twentieth-century-impressions-of-siam-its-history-people-commerce-industries-hci/page-23-twentieth-century-impressions-of-siam-its-history-people-commerce-industries-hci.shtml |quote= All cadastral plans are plotted, drawn, and printed to a scale of 1 to 4,000.... |url=https://archive.org/download/twentiethcentury00wrigrich/twentiethcentury00wrigrich.pdf |format=65.3 MB |access-date= 28 January 2012}}</ref> The square ''wa'', ''ngan'' and ''rai'' are still used in measurements of land area.

The ''baht'' is still used as a unit of measurement in gold trading. However, one ''baht'' of 96.5% gold bullion is defined as 15.16 grams rather than the generic standard of 15 grams. The ''baht'' has also become the name of the currency of Thailand, which was originally fixed to the corresponding mass of silver.

==List of units== {| class="wikitable" !Unit||Thai script||IPA pronunciation||Meaning equivalent||Relative equivalent||Metric equivalent |- ! colspan="6" | Length |- |''Krabiat''||กระเบียด||{{IPA|th|krā.bìat̚|}}||Quarter of a finger|| || 0.5208&nbsp;cm |- |''Nio''||นิ้ว||{{IPA|th|níw|}}||Siamese inch<ref>{{cite book |url=https://books.google.com/books?id=ZaI9AQAAMAAJ&pg=PA592 |title=Treaty of ''Commerce'' and ''Navigation'' with ''The United States''|author=Great Britain. Foreign Office |date=1847|volume=22|section=1 |work=British and Foreign State Papers 1833-1834 |publisher=James Ridgway and sons, Piccadilly |place=London |access-date= 26 January 2020 |quote= ...said fathom being computed to contain 78 English or American inches, corresponding to 96 Siamese inches....|page=592}}</ref><br>''Cf. Digit (unit)<br>finger (unit)'' ||4 ''krabiat''<ref name="RID" />|| 2.083&nbsp;cm |- |''Khuep''||คืบ||{{IPA|th|kʰɯ̂ːp̚|}}||Span||12 ''nio''<ref name="RID" />||25&nbsp;cm |- |''Sok''||ศอก||{{IPA|th|sɔ̀ːk̚|}}||Cubit||2 ''khuep''<ref name="RID" />||50&nbsp;cm |- |''Wa''||วา||{{IPA|th|wāː|}}||Fathom <br>(outstretched arms)||4 ''sok''<ref name="RID" />||2 m |- |''Sen''||เส้น||{{IPA|th|sên|}}||''Cf. Rope (unit)<br>line of rope''<ref name=Giblin/> <br>''Chain (unit)'' |20 ''wa''<ref name="RID" />||40 m |- |''Yot''||โยชน์||{{IPA|th|jôːt̚|}}|| ''Yojana'' ||400 ''sen''<ref name="RID" />||16&nbsp;km <!--โยชน์ [โยด] น. ชื่อมาตราวัด ๔๐๐ เส้น เป็น ๑ โยชน์; การผูก. (ป., ส.).--> |- ! colspan="6" | Area |- |''Tarang wa''||ตารางวา||{{IPA|th|tāː.rāːŋ wāː|}}||Square ''wa''|| ||4 m<sup>2</sup> |- |''Ngan''||งาน||{{IPA|th|ŋāːn|}}|| Work||100 ''tarang wa''|| 400 m<sup>2</sup> |- |''Rai''||ไร่||{{IPA|th|râj|}}|| Plantation||4 ''ngan'' 1 Square ''sen'' |1,600 m<sup>2</sup> (16 a) |- ! colspan="6" | Volume |- |''Yip mue''||หยิบมือ||{{IPA|th|jìp mɯ̄ː|}}||Pinch|| ||7.8125 mL |- |''Kam mue''||กำมือ||{{IPA|th|kām mɯ̄ː|}}||Grain held in an enclosed hand||4 ''yip mue''<ref name="RID" />||31.25 mL |- |''Fai mue''||ฟายมือ||{{IPA|th|fāːj mɯ̄ː|}}||Grain held in the palm||4 ''kam mue''<ref name="RID" />||125 mL |- |''Thanan''||ทะนาน||{{IPA|th|tʰā.nāːn|}}||Coconut shell used for measuring||8 ''fai mue''<ref name="RID" />||1 L |- |''Thang''||ถัง||{{IPA|th|tʰǎŋ|}}||Bucket||20 ''thanan''<ref name="RID" />||20 L |- |''Sat''||สัด||{{IPA|th|sàt̚|}}||Measuring basket||25 ''thanan''<ref name="RID" />||25 L |- |''Kwian''||เกวียน||{{IPA|th|kwīan|}}||Cartload ||100 ''thang''<ref name="RID" />||2 m<sup>3</sup> |- ! colspan="6" | Weight/mass |- |''Salueng''||สลึง||{{IPA|th|sā.lɯ̌ŋ|}}|| || ||3.75 g |- |''Baht'' or <br> ''Bat''||บาท||{{IPA|th|bàːt̚|}}|| Tical||4 ''salueng''<ref name="RID" />||15 g |- |''Tamlueng''||ตำลึง||{{IPA|th|tām.lɯ̄ŋ|}}||Tael||4 ''baht''<ref name="RID" />||60 g |- |''Chang''||ชั่ง||{{IPA|th|t͡ɕʰâŋ|}}||Catty||20 ''tamlueng''<ref name="RID" />||1,200 g |- |''Hap''||หาบ||{{IPA|th|hàːp̚|}}||Picul||50 ''chang''<ref name="RID" />||60&nbsp;kg |}

==References== <references> <ref name="RID">{{citation|last=Royal Institute |title=พจนานุกรม ฉบับราชบัณฑิตยสถาน พ.ศ. ๒๕๔๒ (Royal Institute Dictionary, BE 2542) |place=Bangkok |publisher=Nanmee Books Publications |year=2003 |isbn=974-9588-04-5 |language=th |url=http://rirs3.royin.go.th/word32/word-32-a0.asp |url-status=dead |archive-url=https://web.archive.org/web/20120103161558/http://rirs3.royin.go.th/word32/word-32-a0.asp |archive-date=2012-01-03 }}.</ref> </references>

{{systems of measurement}}

Category:Thai units of measurement Thailand Category:Customary units of measurement Units of measurement Category:Culture of Thailand