Click Here to download the calculator. Save the file to a new folder, unzip and run setup.exe.
I wrote this little calculator simply to save myself some time, it becomes tiresome very quickly doing the math on injector flow rates for each iteration of a design. All input boxes must have a value, they are pretty self explanatory. I added some density values at the bottom of the calculator for quick reference, all values are room temperature density other than propane and LOX, with the LOX temperature being it's nominal cryogenic storage temperature.
Keep in mind the output values are theoretical values, you'll need to gather empirical data to fine tune flow rates. In the future I'll run flow rate tests on various injector designs vs. water and other liquids, I'll post more details here when I have a data set.