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Technical Analysis

Fibonacci Retracement Calculator

Enter a swing high and low to get every Fibonacci retracement and extension price level — for uptrends or downtrends.

01 — Swing Points
$
The peak of the move
$
The trough of the move
Retracement Levels — Uptrend
Range $50.00 · High $150.00 · Low $100.00
0%$150.00
23.6%$138.20
38.2%key$130.90
50%key$125.00
61.8%key$119.10
78.6%$110.70
100%$100.00
Extensions (targets beyond the move)
127.2%$86.40
161.8%$69.10
261.8%$19.10
Level = High − Range × ratio
Range = |High − Low| = $50.00

What is the Fibonacci Retracement Calculator?

A Fibonacci retracement calculator takes a completed price move — from a swing low to a swing high (or vice versa) — and marks the levels where price often pauses or reverses on its way back. Traders use these levels to plan entries, stops, and targets without guessing.

The key retracement ratios come from the Fibonacci sequence: 23.6%, 38.2%, 50%, 61.8%, and 78.6%. The 38.2%–61.8% zone is watched most closely. This calculator also returns extension levels (127.2%, 161.8%, 261.8%) that project where a trend might reach beyond the original move.

How to use it

  1. 01Choose the trend direction — uptrend (measuring a pullback down) or downtrend (measuring a bounce up).
  2. 02Enter the swing high — the peak of the move you are measuring.
  3. 03Enter the swing low — the trough of the move.
  4. 04Read the retracement levels: the prices where a pullback commonly finds support or resistance.
  5. 05Use the extension levels as potential take-profit targets once the trend resumes.

The formula

Uptrend: Level = High − (High − Low) × ratio • Downtrend: Level = Low + (High − Low) × ratio

ratio ∈ {0.236, 0.382, 0.5, 0.618, 0.786} for retracements; {1.272, 1.618, 2.618} for extensions.

Worked example

A stock rallies from a swing low of $100 to a swing high of $150, so the range is $50.

The 61.8% retracement in this uptrend = $150 − ($50 × 0.618) = $119.10 — a common area to look for support on a pullback.

The 161.8% extension = $150 − ($50 × 1.618) is below the low for a downtrend; for projecting a continued uptrend you would measure the new leg. Use extensions in the direction of the trend as targets.

Frequently asked questions

What are the main Fibonacci retracement levels?+

The standard levels are 23.6%, 38.2%, 50%, 61.8%, and 78.6%. Although 50% is not technically a Fibonacci ratio, traders include it because price often reacts there. The 38.2%–61.8% band is considered the most significant.

How do I use Fibonacci retracements in trading?+

Identify a clear swing high and low, then watch the retracement levels for signs of support or resistance — a pause, a candlestick reversal, or a volume spike. Many traders enter in the direction of the trend near the 50%–61.8% zone with a stop just beyond it.

What is the difference between retracement and extension?+

Retracements (0%–100%) measure how far price pulls back within the original move. Extensions (above 100%, e.g. 127.2%, 161.8%) project how far price may travel beyond the move — traders use them as profit targets.

Does the swing high or low order matter?+

No. This calculator automatically treats the larger number as the high and the smaller as the low; you only pick the trend direction, which decides whether levels are measured down from the high or up from the low.

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For educational purposes only. Not financial advice.