# Roman Numeral Converter

It is an online tool that converts Roman numerals into Arabic decimal numbers and vice versa. It has a two-in-one in-built calculator that performs both conversions in no time.

## How to use Roman Numeral Converter?

The interface is a simple one containing two input boxes on the right side and an output box on the left side.

### Note:

You can Roman numerals up to “M”.

Similarly, this converter has a limit to convert decimal numbers up to 4999.

Method of using this tool:

1. Enter the Roman numeral in the box indicating “Roman Number” and click on the “Convert” button to change it into a decimal number.
2. Enter the Decimal number in the box indicating “Decimal Number” to convert it into a roman number.
3. Your respective numbers are shown in a text box on the left side.

## What are the Roman Numerals?

During your studies, you might have read about Roman numerals in Mathematics. Your teacher may have told the usage of this number system. Let us revise the old lesson. Roman numerals are the numbers, originated in Rome around 500 to 600 B.C. They were primarily used to set up a common system of counting. You know that we can only count a minimum amount of things with our bare hands therefore Romans developed this system to count a large number of things.

These numbers were derived from Latin alphabets. Some common Roman Numerals are I, II, III, IV, V, VI, VII, VIII, IX, X. These are the numbers depicting 1,2,3,4,5,6,7,8,9 and 10.

## Arabic Numerals

Indo-Arabic numerals are also called decimal numbers, originated in India and later in Arabia. They constitute the most common number system used pervasively today.

They contain nine numbers and other numbers are formed by their combination: 0,1,2,3,4,5,6,7,8 and 9.

## Roman to Decimal Conversion Table

A table is shown that gives further elaboration:

 Roman numeral (n) Decimal value (v) I 1 IV 4 V 5 IX 9 X 10 XL 40 L 50 XC 90 C 100 CD 400 D 500 CM 900 M 1000