Hurst Cycle Analysis

What is Hurst Cycle Analysis?

Hurst cycle analysis is the framework developed by J.M. Hurst, an American aerospace engineer, in 'The Profit Magic of Stock Transaction Timing' (1970) and his later Cycles Course. It models price as the sum of many nested cycles of different lengths plus an underlying growth component and noise. Traders also refer to its parts by name: cycle nesting for the layered structure, Hurst envelopes for the constant-width channels used to isolate a cycle, and the future line of demarcation (FLD) for its signature projection tool.

Hurst formalized a set of working principles. Summation says observed price is the sum of all active cycles. Harmonicity says adjacent cycle lengths tend to relate by small ratios, usually 2:1. Synchronicity says cycles of different lengths tend to form troughs at about the same time, which is why major lows look like many cycles bottoming together. Proportionality says longer cycles have larger amplitude, and nominality proposes a shared 'nominal model' of typical lengths, running from multi-decade waves down through roughly 18-month, 40-week, 20-week, 80-day, 40-day, 20-day, and shorter components. All lengths are averages: real cycles drift in period and phase.

The practical toolkit has three pieces. Phasing analysis labels the troughs of each cycle degree on the chart, building a map of where the market sits within each nested cycle. Envelopes, drawn as constant-width bands around a smoothed price, make one cycle's oscillation visible. The FLD plots the median price displaced forward by half a cycle's length; price crossing its FLD both signals that the cycle has turned and projects a measured target for the move. Hurst's emphasis on troughs rather than peaks reflects equity behavior, where lows tend to be sharper and better synchronized than highs.

How to Phase a Chart the Hurst Way

Phasing is the core skill; everything else builds on a trough map:

1. 1Start on a weekly chart and mark the most prominent lows, working hypothesis: these are troughs of a longer cycle such as the nominal 18-month or 40-week wave.
2. 2Subdivide: between each pair of longer-cycle troughs, locate the intermediate lows that mark the half-length cycle, respecting the roughly 2:1 harmonic relation.
3. 3Draw a constant-width envelope around a smoothed price to make the target cycle's oscillation visible and to sanity-check trough placement.
4. 4Plot the FLD for a chosen cycle by displacing the bar midpoint forward half that cycle's average length, then watch for price to cross it after a projected trough.
5. 5Expect drift: cycle lengths are averages, so update the phasing as new lows form rather than holding a stale count.

How traders use it

• Swing traders buy near projected troughs of an intermediate cycle when shorter cycles are also due to bottom, using the synchronicity principle to find spots where several cycles should turn together.
• FLD crossings serve as confirmation and measurement: a cross after a projected trough suggests the cycle has turned, and the amplitude of the cross projects a price target for that cycle's advance.
• The longer-cycle position acts as a filter, since a trade against a longer wave that is still falling fights the summation principle; this is a cycle-based version of a higher timeframe trend filter.
• Modern implementations semi-automate phasing, but the analysis retains judgment calls, and two competent analysts can phase the same chart differently; conclusions should be stress-tested against alternative counts.
• Spectral tools such as dominant cycle detection are often used alongside Hurst work to check whether the assumed cycle lengths actually show power in the data.

Hurst Cycle Analysis vs Related Concepts