Roman Numerals and Converter

Roman Numerals is the complete, beautifully designed toolkit for reading, writing and understanding Roman numerals — whether you need a quick conversion, help with a tattoo, or a way to finally learn the rules.

CONVERT INSTANTLY

• Turn any number into Roman numerals, and any numeral back into a number — live, as you type.
• Full range from 1 all the way to 3,999,999 using authentic vinculum (overline) notation for large numbers.
• See exactly how each numeral breaks down, e.g. MCMXCIV = M + CM + XC + IV, with every additive and subtractive group explained.
• Copy any result with a single tap.

PERFECT FOR TATTOOS, DATES & GIFTS

• Convert a full date into Roman numerals — ideal for tattoos, rings, engravings and anniversary gifts.
• Turn birth years, wedding years and copyright dates into elegant numerals.
• Choose your own separators and day/month order.

LEARN & PRACTICE

• A clear, friendly guide to the seven symbols (I V X L C D M) and every rule — additive, subtractive, repetition and the vinculum.
• A short, accurate history of where Roman numerals came from.
• Test yourself with a built-in quiz across four difficulty levels and track your best streak.

HANDY TOOLS

• A Roman-numeral clock face, including the classic IIII convention watchmakers use.
• Add and subtract directly in Roman numerals, with the working shown step by step.
• A fully searchable reference chart — 1 to 100, tens, hundreds, thousands and notable years.

DESIGNED WITH CARE

• A premium, inscriptional look inspired by carved stone and gold.
• Light and dark mode, Dynamic Type and full VoiceOver support.
• Available in 24 languages.
• No account, no sign-up, no clutter.

Whether you are decoding a movie’s copyright year, planning a tattoo, helping with homework or just curious, Roman Numerals makes it effortless.

Download now and convert, learn and create with confidence.