Schaff Trend Cycle

What is the Schaff Trend Cycle?

The Schaff Trend Cycle (STC) is a momentum oscillator developed by currency trader Doug Schaff that runs a stochastic calculation on MACD values instead of price. A MACD line is computed first (23- and 50-period EMAs are the common defaults, slower than the classic 12/26), then a stochastic oscillator normalization is applied to that MACD over a cycle window, commonly 10 bars, smoothed, and applied a second time. The result is a 0-100 line that moves quickly between its bounds and flattens against them while a trend runs.

The premise is that MACD identifies trend turns but arrives late; measuring where the MACD sits inside its own recent range registers the shift before a signal-line cross does. Convention places trigger lines at 25 and 75: a cross up through 25 flags an emerging uptrend, a cross down through 75 an emerging downtrend, and time spent pinned near 0 or 100 reads as trend-in-progress rather than a reversal warning. The extra speed is paid for in choppy conditions, where STC whipsaws like any fast oscillator.

How traders use it

• Trigger-line crossings: long bias on a cross up through 25, short or flat bias on a cross down through 75, usually filtered by a higher-timeframe trend so signals are only taken with the larger flow.
• As an early-warning layer over MACD itself: when STC hooks away from an extreme while the MACD has not yet crossed its signal line, the hook is treated as advance notice to tighten stops or scale down, pending confirmation.
• Saturation as a regime read: an STC pinned near a bound says the move is still one-sided, while rapid full-range oscillation marks rangebound conditions in which its own trend signals degrade.