I’ve rearranged the formulas in Cubit parts and more, updated to be sorted by the general method used. This shows the patterns between the different divisions better.
2018-12-16: Added some formulas for Royal Cubit and Great Span (half royal cubit)
2018-12-18: Added formulas based directly on π, and also √2/π
2019-01-15: Added formulas for “double pole”, standardised a lot of the formulas to use same denominator, to better show link between formula and number of digits, added page for formulas based on e/π∛3, added tau-equivalent formulas to pi page, added inch, and assorted minor tweaks and corrections.