Descent
3 NM per 1,000 ft + 1 NM per 10 kt to slow ± 1 NM per 10 kt of wind
350 = FL350
Altitude to make
kt · optional
kt · optional
NM · for high / low
kt component · ±1 NM per 10 kt
Type altitude now and altitude at the fix. Add speeds, distance and groundspeed for more.
Rule of thumb only. Wind, drag and the FMS path will differ — fly the aircraft, not the app.