Calculating the orbits of binary stars around their barycentre

I've been building a world, partly for test reasons (making sure my spreadsheet works, and so i know what i need to add to it) and partly for fun, but for calender reasons i need to know the orbital period of my binary star system.

More specifically, as i am putting this in a spreadsheet, i need the calculations to figure out the orbital period - preferably dumbed down a little as, when searching myself, i couldn't make heads or tails of it.

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Calculating the orbits of binary stars around their barycentre

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