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Donchian Channel

Calculate Donchian Channel instantly with the exact formula and a worked example.

Donchian Channel

Highest high over N periods
Lowest low over N periods
Current close price
Upper channel line
120
Upper = highest high over N, lower = lowest low over N, middle = (upper + lower) / 2Classic Turtle rules: enter on a 20-period breakout, exit on 10 (System 2: 55 and 20)Calculate Donchian Channel instantly with the exact formula and a worked example.
Lower channel line
100
Channel middle line
110
Channel width
20
Width relative to the middle line
18.18%
Price position in the channel
90%
Donchian channel signal
Price inside the channel

More about: Donchian Channel

What it calculates

The “Donchian Channel” calculator computes Upper channel line from 3 parameters: highest high over n periods, lowest low over n periods, current close price.

Used by investors to estimate returns, project savings, and analyze a portfolio.

Example calculation

With parameters Highest high over N periods = 120, Lowest low over N periods = 100, Current close price = 118 the result is 120 (Upper = highest high over N, lower = lowest low over N, middle = (upper + lower) / 2).

How to use

  1. Enter highest high over n periods, lowest low over n periods and current close price — each field above is adjustable with a slider.
  2. Upper channel line is calculated automatically as you type.
  3. Check the worked example below to see the formula applied to real numbers.
  4. Copy the result or bookmark this calculator.

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FAQ

What is compound interest?
Compound interest means you earn returns not only on your original principal but also on previously earned interest. Formula: A = P · (1 + r/n)^(n·t). Over long periods this produces exponential growth.
How much do regular contributions matter?
A lot. Adding a fixed amount every month and reinvesting earnings dramatically increases the final value, especially over 20–30 years, because each contribution compounds for the remaining term.
What is the Rule of 72?
A quick estimate for doubling time: years ≈ 72 / annual return %. At 8% your money doubles in about 9 years; at 12%, in about 6 years.
What return rate should I assume?
Historically the S&P 500 has returned about 10% per year before inflation (around 7% after). Use a conservative figure for planning and remember that past performance does not guarantee future results.

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