Skip to content
Join the waitlist

Fibonacci Retracement Calculator

Enter a swing high and swing low to get every key retracement level and extension target, for uptrends and downtrends.

Retracement levels

Extension targets

How to use Fibonacci retracements

Retracements help answer one question: after a strong move, where might a pullback stop? Pick a clear swing, from the bottom of the move to the top in an uptrend, and the calculator marks the classic levels in between.

  1. Find a clean swing. The move should be obvious on the chart, not a few choppy candles.
  2. Watch 38.2% to 61.8%. That's the zone where healthy trends most often pause and resume.
  3. Wait for a reaction. A level is a place to watch, not a reason to buy. Look for a reversal candle there; the candlestick pattern guide covers the common ones.
  4. Use extensions for targets. If the trend resumes, 127.2% and 161.8% are common places to take profit.

Frequently asked questions

How are Fibonacci retracement levels calculated? +

Take the distance between a swing high and swing low, multiply it by each ratio (23.6%, 38.2%, 50%, 61.8%, 78.6%), and measure that distance back from the end of the move. In an uptrend: level = high − (high − low) × ratio. In a downtrend: level = low + (high − low) × ratio.

Which Fibonacci level is most important? +

Traders watch the 38.2%, 50%, and 61.8% levels most closely. The 61.8% level, the "golden ratio", is often treated as the last line of defense for a healthy pullback. 50% isn't a Fibonacci ratio, but it's included because markets so often retrace about half a move.

How are extension levels calculated here? +

Extensions project the full swing beyond its end, measured from the start of the move. In an uptrend, the 161.8% extension is low + (high − low) × 1.618. They're commonly used as profit targets once price breaks past the prior high (or low).

Do Fibonacci levels actually work? +

They work partly because so many traders watch them, which turns them into self-fulfilling areas of interest. Treat them as zones to watch for a reaction, ideally lined up with other support/resistance, not as exact prices that must hold.

More free tools

Pivot point calculator Classic, Fibonacci, Woodie, Camarilla, and DeMark pivots from the prior session's high, low, and close. Position size calculator How many shares to buy so a stop-out costs exactly the amount you're willing to lose. Risk-to-reward calculator Risk per share, reward per share, R:R ratio, and optimal position size from entry, stop, and target. Trading expectancy calculator Expectancy, profit factor, breakeven win rate, Kelly sizing, and simulated equity curves from your stats.

Have your AI agent find the swings for you

Zentrix MCP gives Claude, GPT, and Gemini live price data, so your agent can map levels on real charts.

Join the waitlist