Range & Channels

Donchian Channel Calculator

Enter the highest high and lowest low over your lookback window (classically 20 periods) to get the Donchian channel's upper band, lower band, midline, and current width. A close outside the channel is the classic breakout signal; a shrinking width flags a tightening range.

Lookback Period

Classic turtle-trader setting is 20 periods, but any lookback works.

Highest High over the lookback

Lowest Low over the lookback

Current Price (optional)

Upper band···

Lower band···

Midline···

Channel width···

Position in channel···

Educational tool only, not financial advice. The Donchian channel describes recent price extremes, not a guarantee of future direction. Check it against your own plan and risk rules before you trade it.

Built by Jason Parker, founder of Trading Ranges.