Predict Your Finish Time — Just Not for SwimRun
"Ref. 913 HEUER S.A.V.I.C stopwatch" by Ikonicstopwatch is licensed under CC BY-SA 4.0 
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I used to mess around with figuring out how fast I might be for a particular race or workout by using spreadsheets. I know, right? I then started making a tool on the command line, but I never finished it. All great ideas, but not good enough. Today I’m happy to say that My Mind is Racing has its own Pace Calculator. You can use it for a single sport, but it also has a Triathlon mode (including transitions), plus Duathlon, Aquathlon and Aquabike. It’s missing SwimRun, but I’m just waiting on someone to ask for it. I’ve been using it myself and so far I’m quite happy with it. I hope you will be as well.
You can find a link to the Pace Calculator in the footer of every page and in the header under the “For Athletes” menu.