Explain a calculation
Step-by-step explanations and help with a mathematical question.
Inactive · AI required · Not yet set upHOSAKA TOOLS
Useful tools. No AI needed.
Calendars, calculations, conversions and everyday text utilities.
Calculator
Use +, −, *, /, %, parentheses and ^ for powers. Constants pi and e are supported.
Day of the week
Calculated in the selected calendar, extended backward and forward. Historical years use BCE/CE with no year zero.
Julian / Gregorian conversion
Convert the same day between the two calendars. This does not infer when a particular country adopted a calendar.
Roman numerals
Standard Roman numerals from 1 to 3,999.
Unit conversion
Text workbench
Text stays in this browser. Count, tidy and download plain text without AI.
Words are counted by whitespace. Limit: 2 MiB of UTF-8 text. Blank-line and duplicate-line actions change the document.
AI tools
Extract dates from text
Identify historical dates and organise them into a timeline.
Inactive · AI required · Not yet set up