Ordinal Number Converter
Type a number to get its ordinal form with the correct st, nd, rd or th ending, plus the spelled-out ordinal in words.
How to convert a number to an ordinal
- Enter a whole number.
- Read the ordinal form, such as 21st, with the right suffix.
- Copy the ordinal or its written-out words.
Examples
Twenty-first
21
21st (twenty-first)
The teens exception
112
112th (one hundred and twelfth)
Frequently asked questions
Why do 11, 12 and 13 end in th?
English uses th for the teens, so 11th, 12th and 13th are correct even though 1, 2 and 3 normally take st, nd and rd.
What ending do numbers like 21 and 22 use?
The suffix follows the last digit unless the last two digits are 11 to 13. So 21 is 21st, 22 is 22nd and 23 is 23rd.
What about 111, 112 and 113?
They follow the teens rule and all end in th: 111th, 112th and 113th. 121 then goes back to 121st.
Can it spell the ordinal in words?
Yes. It writes ordinals from zero up to one thousand, for example twenty-first or one hundred and third.
Does it work with negative numbers?
Yes for the suffix form. A value like -1 becomes -1st, using the magnitude to choose the ending.
Related tools
Number to Words
Convert numbers to written words instantly. Spell out whole numbers or write a cheque amount in dollars and cents, then copy the result. Free and private.
Roman Numeral Converter
Convert numbers to Roman numerals and Roman numerals to numbers. Type a number from 1 to 3999 or a Roman numeral and copy the result. Free and private.
Area Calculator
Find the area of a circle, square, rectangle, triangle, trapezoid, parallelogram, ellipse, sector or rhombus. Free and runs in your browser.
Arithmetic Sequence Calculator
Find the nth term, the sum of n terms and the full term list for any arithmetic or geometric sequence. Enter the first term, step or ratio, and n.
Average Calculator
Find the mean, median, mode, range, sum, count, min and max of a list of numbers. Paste values separated by commas, spaces or new lines.
Big Number Calculator
Add, subtract, multiply, divide, power, modulo, factorial, GCD and LCM on integers of any length. Exact results with no rounding, computed in your browser.