Mill (currency)

Mill (currency)

The mill or mille () (sometimes mil in the UK, when discussing property taxes in the United States, or previously in Cyprus and Malta) is a now-abstract unit of currency used sometimes in accounting. In the United States, it is a notional unit equivalent to 11000 of a United States dollar (a tenth of a cent). In the United Kingdom it was proposed during the decades of discussion on the decimalization of the pound as a 11000 division of the pound sterling. Several other currencies used the mill, such as the Maltese lira.

The term comes from the Latin "millesimum", meaning "thousandth part".[1]



United States

Missouri mill token

In the United States, the term was first used by the Continental Congress in 1786, being described as the "lowest money of account, of which 1000 shall be equal to the federal dollar."[2]

The Coinage Act (1792) describes milles and other subdivisions of the dollar:

That the money of account of the United States shall be expressed in dollars or units, dismes or tenths, cents or hundredths, and milles or thousandths, a disme being the tenth part of a dollar, a cent the hundredth part of a dollar, a mille the thousandth part of a dollar, and that all accounts in the public offices and all proceedings in the courts of the United States shall be kept and had in conformity to this regulation.[3]

Tokens in this denomination were issued by some states and local governments (and by some private interests) for such uses as payment of sales tax.[citation needed] These were of inexpensive material such as tin, aluminum, plastic or paper. Rising inflation depreciated the value of these tokens in relation to the value of their constituent materials; this depreciation led to their eventual abandonment. (Virtually none were made after the 1960s.)

Nowadays, most Americans would refer to fractions of a cent rather than mills, a term which is widely unknown. For example, a gasoline price of $3.019 per gallon, if pronounced in full, would be "three dollars (and) one and nine-tenths cents". Discount coupons, such as those for grocery items, usually include in their fine print a statement such as "Cash value less than 110 of 1 cent." There are also common occurrences of "half-cent" discounts on goods bought in quantity. However, the term "mill" is still used when discussing billing in the electric power industry as short-hand for the lengthier "11000 of a dollar per kilowatt hour". The term is also commonly used when discussing stock prices, the issuance of founder's stock of a company, and cigarette taxes.

Property tax

Property taxes are also expressed in terms of mills per dollar assessed (a mill levy, known more widely in the US as a "mill rate"). For instance, with a millage rate of 5.753 mills, a $100,000 house would be taxed 575,300 mills, or $575.30. The term is often spelled "mil" when used in this context.[4]


The term mill is often used in finance, particularly in conjunction with equity market micro-structure, as one hundredth of a cent. For example, a broker that charges 5 mils per share is taking in $0.50 every 1000 shares traded. Additionally, in finance the term is spelled "mil".[5]


Mark Twain introduced a fictional elaboration of the mill in A Connecticut Yankee in King Arthur's Court. When Hank Morgan, the American time traveler, introduces decimal currency to Arthurian Britain, he has it denominated in cents, mills, and "milrays", or tenths of a mill (the name perhaps suggested by "myriad", meaning ten thousand or by the Portuguese and Brazilian milreis).

United Kingdom

Proposed on several occasions as a division of the British pound under the "Pound and Mil" system, the mill was occasionally used in accounting. The 1862 report from the Select Committee on Weights and Measures[6] noted that the Equitable Insurance Company had been keeping accounts in mills (rather than in shillings and pence) for such purposes for over 100 years. Such a unit of a thousandth of a pound would have been similar in value to the then-existing farthing coin (1960 of a pound).


Maltese lira coinage included 2 mil, 3 mil, and 5 mil coins from 1972 to 1994, with 10 mils being equal to one cent. Prices could still be marked using mils until the country switched to the euro in 2008, however these were then rounded up for accounting purposes.

Republic of Rose Island

The short-lived and unrecognized Republic of Rose Island (a micronation off the Italian coast) had the mill as its official currency (milo in the official language Esperanto).

Mandatory Palestine, Israel, Jordan

The Palestine pound, used as the currency of the British Mandate for Palestine from 1927 to 1948, was divided into 1,000 mils. Its successor currencies, the Israeli lira and the Jordanian dinar, were also divided into 11000 units, respectively named the peruta and fils. The Israeli peruta lasted until 1960, and the Jordanian fils until 1992.

Hong Kong

Between 1863 and 1866 the mill coin was the lowest denomination issued by the British government in Hong Kong; it was eliminated due to its unpopularity.[7]


The mill was used with the Cypriot pound, starting with decimalization in 1955, and lasting until 1983, when it was replaced by the cent.


To this date 1, 2, and 5 millime (mills) are still in circulation, but they are no longer issued by the central bank. However larger coins such as the 10, 20, 50, and 100 millime coins are still in use and production.

Similar units

  • The Egyptian pound was formerly divided into 1000 milliemes, and 10 millimes equals 1 piaster.
  • The Tunisian dinar is divided into 1000 millimes (10 millimes is the smallest currently-minted coin)
  • The national currencies which are divided into 1000 fils are the Kuwaiti dinar (5 fils is the smallest currently-minted coin), Bahraini dinar (1 fill), Iraqi dinar (25 dinars). But as with the case of the United Arab Emirates dirham and the Yemeni rial, they are divided into 100 subunits.
  • The Omani rial is divided into 1000 baisa.
  • The Libyan dinar is divided into 1000 dirham since 1971.
  • The Japanese yen was formerly divided into 100 sen or 1000 rin. An early proposed (but not accepted) design for the 1-rin coin used "1 mill" in the Romanized text
  • The Hungarian Forint was divided into 10 Hungarian Filler, but filler are no longer in circulation.


  1. ^ Shorter Oxford English Dictionary, 6th Ed, Vol. 1, at 1782
  2. ^ Journals of the Continental Congress, August 8, 1786
  3. ^ U.S. Coinage Act of 1792
  4. ^ "per mil symbol". Tech Target.,,sid9_gci862852,00.html. Retrieved 2007-06-25. 
  5. ^ "SEC Market Structure Concept Release". Tradeworx, Inc. p. 5. Retrieved 2010-12-27. 
  7. ^ Ma Tak Wo 2004, Illustrated Catalogue of Hong Kong Currency, Ma Tak Wo Numismatic Co., LTD. Kowloon, Hong Kong.ISBN 962-85939-3-5

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