ABOUT
DECIMALTOROMAN
The most comprehensive Roman numeral and ancient number conversion platform on the web.
OUR MISSION
DecimalToRoman.com is the internet's most comprehensive and user-friendly platform for converting between decimal numbers and Roman numerals, plus a complete suite of ancient numbering systems. Whether you're a student learning about historical mathematics, a developer working on a project, getting a tattoo, or simply curious about how different cultures represented numbers, our tools provide instant, accurate conversions.
We believe that learning about different numbering systems should be accessible, educational, and straightforward. Our mission is to provide the most accurate, fast, and comprehensive number conversion experience on the web, completely free of charge.
COMPREHENSIVE TOOLS
ROMAN NUMERALS
- • Bidirectional conversion (decimal ↔ Roman)
- • Year converter (2025 → MMXXV)
- • Birthday & anniversary dates
- • Roman numeral math calculator
- • Validation & error checking
- • Clock face generator
ANCIENT SYSTEMS
- • Greek numerals (Ancient Greece)
- • Hebrew numerals (Gematria)
- • Chinese numerals (Traditional)
- • Mayan numerals (Vigesimal system)
- • Egyptian hieroglyphic numbers
- • Babylonian cuneiform numbers
NUMBER TOOLS
- • Number to words converter
- • Ordinal number generator
- • Prime factorization
- • LCM & GCF calculator
- • Random number generator
- • Mathematical operations
DATE TOOLS
- • Days between dates
- • Days until/since calculator
- • Age calculator
- • Date arithmetic
- • Weekday finder
- • Business day calculator
PRIVACY & SECURITY
🔒 YOUR DATA STAYS PRIVATE
IMPORTANT: All conversions and calculations across our entire tool suite are performed locally in your web browser. Your data never leaves your device, ensuring complete privacy and security of your sensitive information, dates, or any other content you process.
CLIENT-SIDE PROCESSING
All calculations happen in your browser using JavaScript. No server communication required.
NO REGISTRATION
Use all our tools immediately without creating accounts or providing personal information.
OPEN SOURCE ALGORITHMS
Our conversion algorithms follow established mathematical and historical standards.
POPULAR USES
PERSONAL
- • Tattoo designs (birth dates, anniversaries)
- • Jewelry engraving
- • Wedding invitations
- • Custom artwork and gifts
- • Home decor and wall art
PROFESSIONAL
- • Legal documents and contracts
- • Academic papers and research
- • Architecture and construction
- • Film and TV production
- • Publishing and typography
EDUCATIONAL
- • History and mathematics classes
- • Ancient civilization studies
- • Homeschooling resources
- • Cultural education
- • Language learning
DEVELOPMENT
- • Software development projects
- • Game development
- • API integration testing
- • Data conversion scripts
- • Historical simulations
ACCURACY GUARANTEE
Our conversion algorithms follow the standard rules of each numbering system, ensuring 100% accuracy for all numbers within the supported ranges. We've extensively tested our tools and validated them against historical sources and mathematical standards.
HISTORICAL ACCURACY
Our ancient numeral systems are based on archaeological evidence and scholarly research.
MATHEMATICAL PRECISION
All calculations use precise algorithms with proper error handling and validation.
CONTACT & SUPPORT
Have questions, suggestions, or feedback? We'd love to hear from you. While we don't have a contact form yet, you can find us through our social media channels or check back for updates on how to reach us directly.