Question 1

What is an ordinal number?

Accepted Answer

An ordinal number indicates position or order in a sequence: 1st (first), 2nd (second), 3rd (third), 4th (fourth), 21st (twenty-first). Cardinal numbers (1, 2, 3) count quantity, while ordinal numbers show rank or position.

Question 2

What is the rule for ordinal suffixes (-st, -nd, -rd, -th)?

Accepted Answer

Numbers ending in 1 use -st (1st, 21st, 31st), 2 use -nd (2nd, 22nd), 3 use -rd (3rd, 23rd), and all others use -th (4th, 5th, 11th, 12th, 13th). Exception: teens 11, 12, 13 always take -th (eleventh, twelfth, thirteenth), not -st/-nd/-rd.

Question 3

Can this tool handle decimals and large numbers?

Accepted Answer

Yes. The converter handles whole numbers, decimals (e.g. 3.5 → 3.5th), negative numbers, and very large integers up to JavaScript's safe integer limit (about 9 quadrillion). Just type your number and the result appears instantly.

Question 4

Is my data sent to a server?

Accepted Answer

No. All conversion happens entirely in your browser using JavaScript. Nothing you type is ever transmitted to any server, logged, or stored — fully private.