A thousandth is one of 1,000 equal parts of a whole or a group. One thousandth may be written as or 0.001. In the image below, the single unit is equal to of the cube. In ordinal numbers, thousandth is next after nine hundred ninety-ninth.

Thousandths is the name of the next place to the right of the hundredths in the decimal numeration system. In 0.367, 7 is in the thousandths place.

See also decimal numeration system, thousandth.