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Historical Math Center

Historical number-system arithmetic, cycles, ratios and user-entered historical measurement factors. 20 tools with purposes, formulas and worked examples.

Simple mode uses starting defaults for extra scenario controls. Advanced exposes those controls where available. Change an entry, then press Calculate.

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Formula, calculation steps & example

All 20 tools: purposes and formulas

Base-60 two-place integer — Use the labeled measurements to calculate base-60 two-place integer.
A + B + … (A, B, C refer to the labeled entries)
Hours to sexagesimal minutes — Use the labeled measurements to calculate hours to sexagesimal minutes.
A × B (A, B, C refer to the labeled entries)
Minutes to sexagesimal seconds — Use the labeled measurements to calculate minutes to sexagesimal seconds.
A × B (A, B, C refer to the labeled entries)
Mayan bars value — Use the labeled measurements to calculate mayan bars value.
A × B (A, B, C refer to the labeled entries)
Mayan bar-and-dot value — Use the labeled measurements to calculate mayan bar-and-dot value.
A + B + … (A, B, C refer to the labeled entries)
Pure base-20 upper place value — Use the labeled measurements to calculate pure base-20 upper place value.
A × B (A, B, C refer to the labeled entries)
Long Count uinal day arithmetic — Use the labeled measurements to calculate long count uinal day arithmetic.
A × B (A, B, C refer to the labeled entries)
Long Count tun day arithmetic — Use the labeled measurements to calculate long count tun day arithmetic.
A × B (A, B, C refer to the labeled entries)
Long Count katun day arithmetic — Use the labeled measurements to calculate long count katun day arithmetic.
A × B (A, B, C refer to the labeled entries)
Long Count baktun day arithmetic — Use the labeled measurements to calculate long count baktun day arithmetic.
A × B (A, B, C refer to the labeled entries)
Archived length conversion factor — Use the labeled measurements to calculate archived length conversion factor.
A × B (A, B, C refer to the labeled entries)
Archived mass conversion factor — Use the labeled measurements to calculate archived mass conversion factor.
A × B (A, B, C refer to the labeled entries)
Historical currency ratio scenario — Use the labeled measurements to calculate historical currency ratio scenario.
A × B (A, B, C refer to the labeled entries)
Whole cycles in a day count — Use the labeled measurements to calculate whole cycles in a day count.
floor(A ÷ B) (A, B, C refer to the labeled entries)
Elapsed cycle percentage — Use the labeled measurements to calculate elapsed cycle percentage.
A ÷ B × 100 (A, B, C refer to the labeled entries)
Years to centuries — Use the labeled measurements to calculate years to centuries.
A ÷ B (A, B, C refer to the labeled entries)
Years to decades — Use the labeled measurements to calculate years to decades.
A ÷ B (A, B, C refer to the labeled entries)
Historical simple-interest scenario — Use the labeled measurements to calculate historical simple-interest scenario.
A × B × C (A, B, C refer to the labeled entries)
Recorded barter quantity ratio — Use the labeled measurements to calculate recorded barter quantity ratio.
A ÷ B (A, B, C refer to the labeled entries)
Historical map scale scenario — Use the labeled measurements to calculate historical map scale scenario.
A × B (A, B, C refer to the labeled entries)

Definitions and source references

Unit definitions and selected model references:

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