I've been using a few formulas from various interweb sources to create recipes with american units. Designing Great Beers joins the growing library tomorrow and I'm assuming that will have everything I want and need to beer algebra my little heart out metrically. Any other fans of long hand recipe design?
When I begin the process of putting a recipe together I will usually rough things out manually and when I think I've got a handle on where I want to go I head for Beersmith and put it all together and tweak accordingly.
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The Commune Brewing Company-Perfecting the "art" of beer since 2010
When I first started I did all manual calculations. I had a pretty sweet spreadsheet made up, so that was cool. Nowadays I use BeerSmith, but occasionally I second guess BeerSmith and whip out the old calculator.
The only thing more asinine than stupid rules is the enforcement of rules simply because they are the rules.