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Convert whole numbers to Roman numerals and back.

Àwọn Àtòjọ-ẹ̀yàn —

Àwọn ìyipadà —

Àwọn Àtòjọ-ẹ̀yàn àwọn ìṣàmúlò-ètò

Ńlà àwọn àwọn ààtò àtòjọ-ẹ̀yàn yìí?

Àkóónú ìṣàmúlò-ètò yìí

A Roman numeral converter turns an ordinary number from 1 to 3,999 into Roman numerals like MCMLXXXIV, or reads a Roman numeral back into a number. Romans built values from the seven symbols I, V, X, L, C, D and M — worth 1, 5, 10, 50, 100, 500 and 1,000.

The system is mostly additive, writing larger symbols before smaller ones and adding them up, but it uses a subtractive shortcut for the 4s and 9s: IV is 4, IX is 9, XL is 40 and CM is 900. This converter also validates the input, rejecting malformed numerals such as IIII or VX.

Worked example: 2024 breaks into 1000 + 1000 + 10 + 10 + 4, which is MM + XX + IV = MMXXIV. Reading it back, MMXXIV adds 1000 + 1000 + 10 + 10 + (5 − 1) = 2024. Because the symbols only reach M, the largest value the standard system can write is 3,999, or MMMCMXCIX.

Àwọn Àtòjọ-ẹ̀yàn

Bawo ni àwọn ìṣẹ̀dà ìṣàmúlò-ètò tí a fi ṣẹ́ wá?

Tí àwọn àmì-ìwé kéré bá dé ní àwọn àmì-ìwé kéré nínú, a tí yọ àwọn àmì-ìwé kéré: IV jẹ́ 4 (5 − 1), IX jẹ́ 9, XL jẹ́ 40 atí CM jẹ́ 900. Tí kò bá jẹ́ bẹ́ẹ̀, àwọn àmì-ìwé náà tí a fi kun àwọn àmì-ìwé kéré nínú àwọn àmì-ìwé kéré.

Kini idi ti o fi jẹ́ pé o jú 3,999 lọ?

Àwọn àwọn iǹẹ̀tì Rome ìpèwọ̀n lọ sí 3,999 (MMMCMXCIX). Àwọn iǹẹ̀tì 4,000 tabi àwọn tí o jù lọ ní àwọn ìṣàmúlò-ètò àti àwọn ìrísí-lẹ́tà tí kò lè ṣàfihàn.

Àwọn àwọn

Kò. Àwọn ìṣàmúlò-ètò Rome kò ní àmì-ìwé fún ìwọ̀n àti àwọn fálù ààyè-iṣẹ́, tí ó jẹ́ àwọn ìṣàmúlò-ètò kan tí a fi àwọn

Bawo ni mo ṣe lè kọ̀ 4 àti 9 nínú àwọn ìtàn Rome?

They use the subtractive rule: 4 is IV (one before five) and 9 is IX (one before ten). The same pattern gives 40 = XL, 90 = XC, 400 = CD and 900 = CM.

Àwọn àwọn

MMXXIV jẹ́ 2024: Ms meji ní 2,000, Xs meji ní 20, ati IV ní 4. Àtòjọ-ẹ̀yàn àwọn iǹẹ́ẹ̀lì Rome yìí kọ́ gbogbo àmì-ìwé láti apa àwọ̀ sí ọ̀tún, àti àwọn ìṣàfarawe-ìtàn tí a bá fi àwọn iǹẹ̀yàn kéré.

Kini idi ti aagójútó náà fi dẹ́kun àwọn à

Standard Roman notation never repeats a symbol four times; four is written IV, not IIII. The converter checks that a numeral is in canonical form and flags non-standard spellings as invalid.

API — ló àwọn ìṣàmúlò-ètò yìí láti inú ìṣàmúlò-ètò

Fi àwọn ìṣàmúlò-ètò yìí kọ̀ǹpútà yìí láti jẹ́ ààyè-iṣẹ́ JSON tí a tí fi pamọ́ - kò ní bọ́tìnì kan tí a fẹ́. Fi àwọn fálù ààyè-iṣẹ́ sílẹ̀ sí bí àwọn àwọn ìṣàmúlò-ètò àti JSON. Anything you omit uses the same default this page is pre-filled with; an unknown parameter is a 400, never a silent zero. Ka àwọn àkọlé API kíkún →

Àwọn Ààyè Ìjánu-ìṣàmúlò-ètò

GET https://calculator.free/api/v1/roman-numerals/

curl

curl "https://calculator.free/api/v1/roman-numerals/?amount=2024&from=arabic&to=roman"

JavaScript `fetch()`

const r = await fetch(
  "https://calculator.free/api/v1/roman-numerals/?" + new URLSearchParams({
    "amount": "2024",
    "from": "arabic",
    "to": "roman"
  }));
const data = await r.json();
console.log(data.results);

Results are estimates for general guidance only, not financial, medical or tax advice.

Àkóónú ìṣàmúlò-ètò yìí

Àwọn Àtòjọ-ẹ̀yàn

Àwọn Ìṣàmúlò-ètò Ìṣàmúlò-ètò

Àwọn Ààyè Ìjánu-ìṣàmúlò-ètò

curl

JavaScript fetch()

JavaScript `fetch()`