SubCalc, the Subcaucus Calculator, assists convenors of precinct caucuses and conventions in Minnesota. The Minnesota Democratic Farmer Labor (DFL) party uses a wonderful, but bit arcane, "walking subcaucus" process that is simple enough to do, but rather difficult to tabulate. This app calculates the number of delegates each subcaucus gets when you enter the total number of delegates your precinct or convention is allowed and how many people are in each subcaucus. The rules it follows appeared on page 4 of the DFL 2018-2019 Official Call, including the proper treatment of remainders. It makes the math involved in a walking subcaucus disappear. The app could be used to facilitate a "walking subcaucus" or "proportional representation" system for any group.