History tools
Year and era conversion, timelines, Korean history, and research or education helpers organized by group.
Year and era conversion, timelines, Korean history, source analysis, and study helpers in one history app.
History app structure
This first slice exposes four working tools and keeps the rest as inventory. Features that need large event or person datasets will come after reviewed static data is ready.
Year and era conversion
BCE/CE, centuries, historical intervals, calendar systems, eras, and ancient calendars.
BCE/CE year calculator
Calculate intervals across BCE and CE while respecting that there is no year zero.
Century calculator
Convert years to centuries and centuries back to year ranges.
Historical period calculator
Calculate elapsed years between two historical year labels with BCE/CE boundary handling.
Julian and Gregorian calendar converter
Convert Julian and Gregorian dates with a reference offset.
Korean era name converter
Convert selected modern Korean era names such as Gwangmu and Yunghui to CE years.
Dangi year converter
Convert between Common Era and Dangi years.
Buddhist Era converter
Convert between Common Era and Buddhist Era years.
Minguo year converter
Convert between Common Era and Minguo years.
Chinese era name converter
Look up approximate CE ranges for major Chinese dynasties.
Roman calendar date converter
Describe a month/day using Kalends, Nones, and Ides.
French Republican calendar converter
Convert dates bidirectionally between French Republican years 1-14 and Gregorian dates.
Hebrew calendar converter
Hebrew calendar converter
Hijri calendar converter
Hijri calendar converter
Timelines, events, and quizzes
Personal timelines, world events, people and dynasty comparisons, memorization, and today-in-history tools.
Personal history timeline generator
Sort user-entered events into a clean chronological timeline card.
World history timeline generator
Build a chronological reference for ancient, medieval, and modern world-history milestones with study notes and source cautions.
Historical event order quiz
Practice placing four representative events in chronological order.
Year event quiz
Choose the representative event associated with a year.
Historical person age calculator
Calculate how old a selected historical person was in a given year.
Historical contemporary comparator
Check whether two historical figures lived at the same time.
Lifespan overlap calculator
Enter two lifespans and calculate whether they overlapped.
Dynasty timeline by country
Compare representative Korean, Chinese, and Japanese dynasties or periods in chronological order with boundary caveats and source-check guidance.
Ruler term comparison
Compare the terms of selected rulers side by side.
War duration calculator
Look up start and end years and durations for representative wars.
Dynasty duration calculator
Compare approximate durations of representative dynasties.
Empire territory change slider
Compare rough territory-size milestones for representative empires.
Historical timeline card generator
Turn an event name, year, and note into a presentation-style timeline card.
History timeline memorizer
A timeline memorizer that hides and reveals key events.
Random historical event generator
Draw a prompt from a small reviewed event list for discussion or writing.
Today in history generator
Draw a prompt from a small reviewed event list for discussion or writing.
Korean history
Korean eras, Joseon kings, sexagenary cycles, traditional units, genealogy, and study quizzes.
Korean history era calculator
Enter a year and see a broad Korean-history period label.
Joseon king order quiz
Show an ordered answer card for four Joseon kings.
Joseon king reign calculator
Look up reign years and durations for the 27 Joseon kings from a static table.
Sexagenary cycle calculator
Calculate the sexagenary stem-branch name for a CE year.
Dangi and CE converter
Convert Dangi and CE years for Korean-history study.
Goryeo and Joseon rank table
Review representative Goryeo and Joseon official ranks.
Traditional Korean length converter
Convert traditional Korean length units to metric reference values.
Traditional Korean weight and volume converter
Convert traditional Korean weight and volume units with reference values.
Joseon-era age calculator
Compare Korean counted age and international age from birth year and reference year.
Genealogy generation calculator
Calculate generation distance and direction between two generation numbers.
Bon-gwan surname search
Look up selected bon-gwan examples for common Korean surnames.
Korean history exam quiz generator
Draw short multiple-choice practice questions on core Korean-history events.
Heritage era quiz
Study representative heritage items and their broad periods.
Joseon currency value estimator
Estimate mun currency with a very rough rice-price reference.
Royal tombs checklist
Organize representative Joseon royal tomb visit checks and sample tomb sites.
Research and education
Citation notes, source-analysis prompts, study questions, ancient numerals, and family trees.
Historical quote source helper
Build a source-check note for a historical quote.
Source analysis question generator
Generate author, context, and perspective questions for reading a historical source.
History exam question generator
Draw random practice questions from a small reviewed static history question bank.
Ancient numeral converter
Encode or decode integers and Roman or Ionic Greek numerals from 1 to 9,999.
Family tree generator
Parse parent > child lines into a simple family relationship list.
Citation generator
Citation generator
Roman numeral year converter
Roman numeral year converter
Related existing tools
Frequently asked questions
How much historical data is included?
This first slice uses input-based calculations and a small static question bank only. Large event and person datasets are not included yet.
Does it make claims about controversial history?
No. The app focuses on calculation, organization, and study support, and avoids unsourced controversial assertions.
Why is BCE/CE math different from normal subtraction?
Historical year notation has no year zero. 1 BCE is followed by 1 CE, so crossing the boundary requires an adjustment.