What is a good ADX number?

A good ADX number is above 25, which signals a strong, tradable trend, while readings below 20 indicate a weak or absent trend.

Trades in the range of 25-50: Moderately strong trend.
Trades in the range of 50-75: Indicates a strong trend
Trades in the range of 75-100: Indicates a very strong trend.

A trend may be starting to form, but it lacks confirmation in the 20-25 zone.

ADX measures trend strength only, not direction, so pair it with the +DI and -DI lines for bias. Rising ADX: Strengthening trend. Falling ADX: Weakening trend.