This is based on System's Fair Price Model as of Today.

Milestone:
$20,000 by Aug. 2019
$37,500 by Aug. 2020
$57,500 by Aug. 2021

When Bitcoin priced higher than this trend, you could consider it over valued.
When Bitcoin priced lower than this trend, you could consider it under valued.


Gray line: Lower Fair Value Mean
Orange Line: Higher Fair Value Mean
Blue Line: Actual Bitcoin Price

Gray Line is lower than Blue and Orange -> Bullish Trend
Orange Line is lower than Blue and Gray -> Bearish Trend