Or just multiply altitude to lose in 1000 ft x 3? (3nm per 1000ft), works well for almost every jet and using this daily in the real world. e.g. 3 degree FPA descent from FL300 to sea level = 90 nm (30 x 3) + deceleration + wind.
Deceleration from 290 kts (or whatever speed you are flying above FL100) to 250 kts and later from 250 kts to 160 kts for approach, 1 nm per 10 kts level flight / 2 nm per 10 kts using 1000 ft/min (no spoilers). No calculator needed…
For tailwind add 1 nm per 10kts.
The picture below is specific for the Embraer 190/195, the Airbus might be closer to a 3 degree descent on idle thrust.
