History Tools

Records, Inscriptions & Timelines

Decode archival notation, translate historical inscriptions, and explore tools that make classical records readable again. These calculators turn public domain references into practical, modern utility.

Julian Date Converter

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Convert ordinal dates (YYDDD food stamps), astronomical Julian Day Numbers, and historical Julian vs Gregorian calendar dates — all bidirectional.

Calendar History Ordinal Date Julian Day Number

User Intent: "What date is this food stamp code? / Julian day number converter."

Roman Numeral Converter

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Convert between Arabic numbers and Roman numerals for inscriptions, print design, and archival research.

Roman Numerals Inscriptions Reference

User Intent: "Convert Roman numerals to numbers (or vice versa)."

Roman Numeral Date Converter

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Convert modern dates into classical Roman numeral notation. Perfect for inscriptions, historical research, and creative projects.

Latin Notation Historical Records Inscriptions

User Intent: "How do I write today's date in Roman numerals?"

Pigpen Cipher Decoder

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Encode and decode messages in the Pigpen cipher — the Freemason secret code beloved by geocachers, escape rooms, and mystery lovers.

Cryptography Geocaching Secret Codes

User Intent: "Decode pigpen cipher symbols."

Historical Side-Hustle Calculator

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Compare effort-to-pay ratio of 1900s manual labor skills vs. modern gig work. Is canning/sewing worth it vs. gig work?

Historical Labor Data Economic Medium Effort

User Intent: "Is canning worth my time vs. gig work?"

Interactive Historical Timeline

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Extract events from public domain biographies and render interactive Svelte timeline visualizations.

Public Domain Biographies Visualization High Effort

User Intent: "Visualize historical events from this era"