TECHNICAL ANALYSIS
Fibonacci Calculator
Enter the swing high and swing low of any move and get every retracement level from 23.6% to 78.6% — plus the extension targets past the swing — for stocks, forex, futures, and crypto.
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THE MATH
Levels carved out of a single swing
Every Fibonacci level is a fixed fraction of one price move. Measure the swing, multiply by the ratio, and the level falls out — no chart drawing required.
retracement = high − (high − low) × ratio · extension = low + (high − low) × ratioIn an uptrend, the retracement levels — 23.6%, 38.2%, 50%, 61.8%, and 78.6% — mark how far a pullback has given back of the original rally, measured down from the high. In a downtrend the ladder mirrors: levels measure the bounce up off the low. The extensions — 127.2%, 161.8%, 200%, and 261.8% — project the swing beyond its endpoint, giving targets for the next leg once the pullback resolves.
The ratios come from the Fibonacci sequence (0.618 is the golden ratio; 0.382 and 0.236 are its powers), but you don’t need to believe in sacred geometry for the levels to matter: enough traders watch them that orders cluster there. A shallow 23.6–38.2% pullback signals a strong trend; 61.8% is the classic “last defense” of a trend; a move through 78.6% usually means the swing is failing.
FIBONACCI CALCULATOR
LiveRetracement zone
RETRACEMENT LEVELS
EXTENSION TARGETS
Levels are pure arithmetic on the swing you enter — they mark potential reaction zones, not guarantees.
WORKED EXAMPLE
A $451.20 → $482.60 rally
A stock runs from a swing low of $451.20 to a swing high of $482.60 — a $31.40 move — and starts pulling back.
The 38.2% retracement sits at 482.60 − 31.40 × 0.382 = $470.61, the 50% at $466.90, and the golden 61.8% at $463.19. A trader looking to join the trend watches how price behaves into $470.61–$463.19 — the heart of the pullback zone. If buyers step in at the 61.8% and the trend resumes, the 161.8% extension at 451.20 + 31.40 × 1.618 = $502.01 becomes a measured target for the next leg, with the 127.2% at $491.14 as the first checkpoint.
Note the risk framing this creates for free: entry near $463, invalidation below the 78.6% at $457.92, target $491–502. That is roughly 1:5 — the reason pullback traders like these levels has as much to do with risk/reward as with the ratios themselves.
IN PRACTICE
Levels earn trust through confluence
A Fibonacci level alone is a line on a chart. A level that coincides with other evidence is a trade location.
Experienced traders rarely act on a retracement by itself. They look for confluence: a 61.8% that lands on prior support, a 50% that overlaps a rising 200-period moving average, an extension that matches a prior high, or a level that lines up across two timeframes. Each independent reason concentrated at one price makes the reaction more likely — and gives a cleaner invalidation when it doesn’t hold. The calculator gives you the exact prices; the chart tells you which ones are worth watching.
FAQ
Which retracement level is most important?＋
The 61.8% — the golden ratio — is the most watched, with 38.2% and 50% close behind. Strong trends tend to hold shallow levels (23.6–38.2%); deeper pullbacks to 61.8% are the classic trend-continuation entry; a close beyond 78.6% is usually read as the swing failing rather than retracing.
How do I pick the swing high and swing low?＋
Use the extremes of the impulse move you're measuring — the clear start and end of one directional leg on your trading timeframe, typically the most recent significant pivot points. Bigger swings on higher timeframes produce levels that more participants are watching, which tends to make them more reliable.
What's the difference between retracements and extensions?＋
Retracements (23.6–78.6%) sit inside the swing and mark how much of the move has been given back — traders use them for entries. Extensions (127.2–261.8%) project beyond the swing's endpoint and are used as profit targets for the next leg once the pullback holds.
Do Fibonacci levels actually work?＋
They are reference prices, not forces. Their practical value comes from self-fulfilling attention — enough traders place orders at these levels that reactions cluster there — and from the clean risk/reward structure they define. Treat a level as a place to look for confirmation, never a reason to trade by itself.
Which markets can I use this for?＋
Any market with a price: stocks, ETFs, futures, forex, and crypto. The calculator follows the decimal precision you type, so it works as well on a 1.0842 EUR/USD swing as on a 6,400-point index future.
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