Just Joined Fascat, how to calculate FTP without bike computer

I did my first 20 min field test and got these results. Need FTP and sweet spot info.
5.56 miles
16.61 avg MPH
21.74 max mph
124’ ascent
319 calories
162 max heart rate
154 avg heart rate
115 max cadence, 77 avg.
I’m 64 years old, 6’, 165lbs.
Thanks for your help.
Phil Crisp

Nice work!

Enter 154bpm as your threshold heart rate as described here by Coach @Jake scroll down for heart rate)