Info Line

The Info Line (also called a "measure line," "data line," or "price ruler") bridges the gap between a trend annotation tool and a measurement calculator. While it looks identical to a trend line, its primary purpose is informational — it continuously updates the price difference, percentage change, ratio, and bar count between its two endpoints as the chart evolves and as new bars print.

This is an essential tool for position sizing, risk management, and trade planning. Rather than manually subtracting prices and calculating percentages — a process that is slow, error-prone, and distracts from chart reading — the info line does it live on the chart. It is particularly valued by swing traders and position traders who need to quickly assess the magnitude of a move, measure stop-loss distance, or estimate profit targets without switching to an external calculator or taking their eyes off the chart.

The info line is also invaluable for backtesting and journaling. When reviewing past trades, dragging an info line from entry to exit instantly shows the realized percentage gain or loss, the holding period in bars, and the price ratio — all critical data points for performance analysis.

The Info Line requires 2 anchor points. Click to place the first anchor (P1) at the reference price, then click again to place the second anchor (P2) at the measurement point. During the second click drag, a preview line follows the cursor with a live tooltip showing the current price difference and percentage between the two points.

After placement, drag either endpoint to update all measurements in real time. The info panel floats near the line mid-point and updates continuously as you drag. When new bars print, the P2 price adjusts if it was placed on the last visible bar — the percentage change recalculates automatically with each new tick. This makes the info line a live P&L tracker for open positions.

On hover, the endpoints and line body highlight for interaction. Multiple info lines can exist on the same chart simultaneously; each maintains its own measurement display independently. The panel can be repositioned by dragging it. The precision setting controls how many decimal places are shown for prices and percentages.

The info line offers granular control over which measurements are displayed and how they are formatted, allowing you to customize it for specific use cases.

Risk Measurement: The most common and powerful use of the info line is instantaneous risk assessment. Place P1 at entry price and P2 at stop-loss level. The percentage change tells you exactly how much capital is at risk per unit. For a $10,000 position where you risk 2% of capital, you can immediately verify whether the stop distance aligns with your risk parameters. This eliminates the most common source of trading errors: incorrect position sizing.

Target Projection & Fibonacci Extensions: Measure the height of a completed swing (swing low to swing high) using an info line. Use the ratio display to quickly check if current price is at a Fibonacci multiple (1.272, 1.618, 2.618) of that original move. The ratio readout is a direct Fibonacci calculator — no need for a separate Fibonacci tool.

Momentum Comparison Across Swings: Place info lines on two adjacent swings. Compare the percentage change and bar count of each. Rules of thumb: a smaller percentage gain over more bars = momentum deceleration; a larger percentage gain over fewer bars = momentum acceleration. This quantifies what the eye sees subjectively, providing an objective measurement of momentum shifts.

Position Tracking: Leave an info line from your entry price to the current bar while a trade is open. The live-updating percentage display shows your unrealized P&L in real time, bar by bar. This helps you monitor whether the trade is performing as expected and whether your trailing stop is keeping pace with the move.

1. 1
   Place P1 at the reference price

   Click at the start of the segment you want to measure — your entry price, a swing low, a swing high, or any structural pivot.
2. 2
   Place P2 at the target price

   Click at the end of the segment. The floating info panel appears immediately with all enabled measurements.
3. 3
   Read the measurements

   The panel shows price at each endpoint, percentage change, ratio, and bar count. A positive percentage means price rose from P1 to P2.
4. 4
   Adjust as needed

   Drag either endpoint to refine the measurement. All values update in real time during the drag — no button clicking required.
5. 5
   Customize the display

   Toggle individual measurements on/off via the settings panel. Adjust precision if values appear rounded to 0.00%.

• A positive percentage means price has risen from P1 to P2 \u2014 the segment is in the black.
• A negative percentage means price has fallen from P1 to P2 \u2014 the segment is in the red.
• The ratio is always positive: R = P2 / P1. R > 1 means price rose; R < 1 means price fell.
• A large bar count with a small percentage change = slow, grinding move with low momentum.
• A small bar count with a large percentage change = sharp, impulsive move with high momentum.
• The reversal of sign (positive to negative or vice versa) as P2 is dragged past P1 marks the breakeven point.

Multi-Leg Impulse-Correction Measurement: Place one info line from swing low to swing high (impulse leg A), and a second from the subsequent swing high to the next swing low (corrective leg B). Compare the percentage and bar count of the impulse vs. the correction. A shallow correction (less than 38.2% of the impulse) in fewer bars suggests strong trend momentum. A deep correction (more than 61.8%) suggests weakness.

ATR-Based Position Sizing Workflow: Place P1 at entry and use the info line to measure the ATR-based stop distance. Read the percentage to verify the stop aligns with your 1% or 2% per-trade risk limit. Then calculate position size: risk ($) / stop percentage = position size. This entire workflow happens in seconds without leaving the chart.

Pair Trading Spread Analysis: For pair trading, place info lines on both legs of the spread. Compare the percentage move of each to assess which side is driving the current divergence. If one leg has moved +3% while the other has only moved +0.5%, the divergence is driven by the faster-moving instrument.

Session Range Tracking: Place an info line from the session open to the current bar. The live percentage shows the intraday return. Use this to gauge whether the current session is developing into a trend day, a range day, or a reversal day based on the magnitude and direction of the move.

• 1.Info line / measure tool — TradingView Help
• 2.Measuring price moves — Investopedia
• 3.Technical Analysis of Financial Markets — John J. Murphy
• 4.Position Sizing & Risk Management — Van K. Tharp
• 5.Fibonacci Trading: How to Use Retracements & Extensions — Carolyn Boroden
• 6.How to Calculate Risk/Reward Ratio — BabyPips