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Fibonacci Calculator

Retracement and extension levels from a swing you define.

Inputs it asks for
Swing high value
Swing low value
Direction of the move choose
Formula shown · assumptions disclosed

What it computes

Retracement and extension levels from a swing you define. The page states the equation, the units it expects and the rounding it applies, so the result can be reproduced by hand.

Where it sits in the chain

A calculator gives you a number. This one feeds the next: account to risk, risk to position size, position size to the trade, and the trade to expectancy, drawdown and risk of ruin.

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Inputs
Result
23.6% 1.17634
38.2% 1.17283
50.0% 1.17000
61.8% 1.16717
78.6% 1.16314
Range 0.02400
The 50% level is not a Fibonacci ratio at all — it is the midpoint, included by convention. Treat the set as common reference levels rather than as a law.
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The formula

retracement (up move) = high − (high − low) × ratio
retracement (down move) = low + (high − low) × ratio
ratios: 0.236, 0.382, 0.500, 0.618, 0.786

The 50% level is not a Fibonacci ratio at all — it is the midpoint, included by convention. 0.786 is the square root of 0.618.

Worked example

An up move from 1.1580 to 1.1820, so a range of 0.0240:

range = 1.1820 − 1.1580 = 0.0240
38.2% = 1.1820 − 0.00917 = 1.17283
50.0% = 1.1820 − 0.01200 = 1.17000
61.8% = 1.1820 − 0.01483 = 1.16717

What it assumes

  • The swing high and low are chosen by you. Different swings give different levels on the same chart, which is the method’s main weakness.
  • Nothing here is measured. These are reference levels many participants draw, not a tested edge.

Common questions

Which Fibonacci level matters most?

61.8% and 50% are the most widely watched. Whether that makes them useful is a question about crowd behaviour rather than about the numbers.

Is 50% a Fibonacci ratio?

No. It is the midpoint of the range, included by convention because it is watched, not because it derives from the sequence.

Which swing should I measure from?

That is the method's weakness rather than a question with an answer. Different swings give different levels on the same chart, so state the swing you used or the levels are not reproducible.

What to work out next

A calculator answers one question and raises the next. These are the ones this figure feeds into.

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Fibonacci Calculator · rounding shown to the precision displayed

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