What Is a Renko Chart? How Brick-Based Charts Work

A Renko chart is a time-independent charting method that builds price-action 'bricks' based solely on price movement, helping to filter out market noise.

Traditional time-based charts create a new candlestick every minute, hour or day, regardless of how far the price moves. Renko charts work differently. A new brick forms only when the price moves by a predefined amount.

This can help technical traders identify underlying trends while removing smaller price fluctuations. However, removing time from the chart also creates structural trade-offs, particularly around visual lag and trade execution.

How Renko Charts Work: The 45-Degree Brick Mechanics

You'll see Renko charts display price movements as uniform blocks, known as bricks, arranged diagonally at 45-degree angles. Each brick represents a fixed price distance, such as $1.00 on a share or 10 pips on a currency pair.

When the price rises by the specified brick size, a new bullish brick is plotted above and alongside the previous brick. If the price continues moving in the same direction, additional bricks form in sequence. If the price moves by less than the required threshold, the chart remains unchanged, regardless of how much time passes.

A key structural feature of a Renko chart is its reversal rule. To form a brick in the opposite direction, the price must move twice the brick size from the high or low of the last completed brick.

For example, on a 10-pip Renko chart, the price needs to rise by 10 pips to form another bullish brick. However, after a series of bullish bricks, the price must fall by 20 pips from the top of the latest completed bullish brick before a bearish reversal brick can appear.

This two-brick requirement acts as a built-in trend filter. Smaller pullbacks do not immediately change the chart's direction, which can make sustained trends easier to follow. The trade-off is structural lag: by the time a reversal brick is confirmed, a significant part of the price reversal may already have taken place.

Construction Methods: Fixed Brick Size vs Volatility (ATR)

You'll generally set your Renko brick size using one of two methods: a fixed price value or a volatility-based measure.

Fixed-pip or fixed-price sizing uses a constant value. For example, a trader might use a 10-pip brick on a Forex pair or a 20-point brick on an equity index.

Fixed sizing makes historical charts visually consistent, but the setting may become less suitable as volatility changes. If market volatility rises sharply, a fixed brick size may generate many bricks in a short period, reintroducing some of the price noise that charts are designed to remove. If volatility falls, the chart may remain unchanged for long periods without forming a new brick.

Average True Range (ATR) sizing takes a different approach by adjusting the brick size in line with market volatility. An ATR-based Renko chart calculates Average True Range over a chosen lookback period, such as 14 periods, and uses that value to determine the brick size.

Renko Charts for CFD Traders: Trend Identification and Real Execution Costs

If you're trading leveraged Contracts for Difference (CFDs), Renko charts can give you a clearer visual structure for spotting trends, support and resistance. By removing the upper and lower wicks found on standard Japanese candlesticks, price levels appear as cleaner, step-like boundaries.

However, a smooth historical chart does not necessarily reflect how easily trades could have been executed in real time. Several practical factors can affect trading results:

• Completion-Based Order Execution: A Renko brick is not confirmed until the price has moved through the full brick threshold. Traders who open positions after a brick completes are therefore responding to a price move that has already taken place.
• Execution Slippage: Because a brick completes when the price reaches a predefined threshold, fast-moving markets can cause an order to be filled at a less favourable price than the brick's displayed closing level.
• Cost Impact from Lag: According to the Financial Conduct Authority, around 70–80% of retail CFD accounts lose money when trading leveraged products. Entering after a two-brick reversal threshold may also increase the distance to a logical stop-loss level, which can increase the amount of capital at risk per trade.

In practice, many traders find that historical Renko charts appear smooth and straightforward, while real-time brick formation can feel less predictable during high-impact news events. A single sharp price move can complete two bricks in quick succession, resulting in unexpected execution prices.

Renko vs Heikin Ashi: Decoupling Time vs Smoothing Time

If you're looking to reduce market noise, you'll often compare Renko charts with Heikin Ashi modified candlesticks. Both approaches aim to smooth price action, but they use fundamentally different methods.

Renko charts separate price movement from fixed time intervals. Bricks form only when the price moves by the required amount, so time does not advance across the horizontal axis in regular intervals.

Heikin Ashi charts retain a standard time axis, such as five-minute or one-hour periods. Instead of plotting standard open, high, low and close prices, Heikin Ashi uses modified calculations based on averaged price data. This creates a smoother time series in which candle colours may remain consistent for longer during trending markets.

Traders who need precise time-based analysis, such as session opens or volume-by-time analysis, may prefer Heikin Ashi or standard candlestick charts. Traders who want to remove periods of low-volatility consolidation from the visual chart may prefer Renko construction.

Structural Risks and Common Mistakes

If you use Renko charts without accounting for their structural limitations, you can run into several trading mistakes:

• Hidden Intra-Brick Volatility: A completed bullish brick shows that the price moved from one threshold to the next, but it does not show every movement that occurred before completion. For example, the price may have fallen sharply before recovering enough to complete the brick. Traders who rely only on the Renko view may therefore underestimate intra-brick drawdown.
• Whipsaw Costs in Ranging Markets: When an asset trades sideways within a narrow range, the price can repeatedly move far enough to trigger reversal bricks in both directions. This can produce alternating bullish and bearish signals, potentially leading to late entries and repeated trading costs, including spreads and overnight swap charges.
• Static Size Degradation: Using a fixed 5-pip brick without adjusting it during a sharp increase in volatility, such as around a central bank interest-rate announcement, can cause bricks to form rapidly and increase the risk of delayed execution and slippage.

What Are the Main Advantages and Drawbacks of Renko Charts?

This charting method serves a specific purpose in technical analysis: highlighting trend direction by removing fixed time intervals and smaller price fluctuations. They can make trends, support and resistance levels easier to identify visually.

However, this simplicity comes with trade-offs. The lag involved in confirming reversal bricks, together with the absence of detailed intra-brick price action, means traders need to account for information that the chart does not display.

When evaluating broader CFD trading strategies, Renko charts are better treated as a specialised visualisation tool rather than a standalone trading system. Trading CFDs carries a significant risk of losing money, and leverage can cause losses to occur quickly. Technical chart structures should therefore be used as educational and analytical tools rather than as guarantees of future market movement.