How a brick gets built
Pick a brick size, for example a fixed number of points. The chart then waits. Nothing new is drawn while price stays within that distance of the last completed brick. When price travels one full brick size beyond the close of the last brick in the same direction, a new brick is added. Reversing usually takes more work: most implementations require price to travel two brick sizes against the current direction before a brick of the opposite colour appears.
Notice what is absent from that description. There is no mention of bars, candles, intervals or clocks. The chart is driven entirely by distance travelled. A brick that takes a minute and a brick that takes a week look identical, because the only thing recorded is that the distance was covered. The horizontal axis still looks like time on most displays, but it is really just the order in which bricks completed, with the gaps between them unmarked.
What the chart looks like as a result
The visual effect is immediate. Wicks disappear, because a brick has no high or low beyond its own boundaries. Gaps disappear, because a jump simply produces several bricks in a row. Runs of one colour become long and unbroken, and a change of colour stands out in a way it never does on a candle chart.
That clarity is why people like it. Levels are easy to draw, because the brick boundaries are evenly spaced and a line across the top of a run of bricks is unambiguous. A break of that line is equally unambiguous. For traders whose main problem is reacting to every small reversal, the chart removes most of what they were reacting to. The question is whether what it removed was noise or whether some of it was signal, and the answer depends entirely on what you were using the chart for.
Removing time removes information
This is the part that gets skipped. Time is not decoration on a price chart. It carries the speed of a move, how long a level was defended, which session the move happened in, and whether a period of quiet preceded an expansion. A brick chart deletes all of it.
Consider two sequences of four bricks in the same direction. One printed inside a single minute on a headline. The other printed across two slow sessions of grinding. On a brick chart they are the same picture. In reality they are opposite situations: one is a repricing that may retrace as fast as it came, the other is sustained drift that has absorbed a lot of two way participation. Nothing in the brick chart distinguishes them. Session context, which is a large part of how gold behaves, is also gone, so the information in reading a fast market has no equivalent on a brick display. Traders who use bricks seriously keep a time based chart open beside them for precisely this reason.
The last brick is not final
A brick appears on screen as soon as the distance condition is met by the current price. Price can then come back. Depending on how a particular implementation handles it, the forming brick may vanish or be redrawn. Either way, the chart you see in real time is not the chart you will see afterwards.
This has a specific consequence for testing. A rule written as enter when a brick closes beyond the line looks excellent on history, because every brick in the record is a completed brick. Live, the moment a brick is visibly complete is a moment when price has already travelled the full brick distance, and getting filled at the brick boundary is not available. The gap between tested and traded results is structural, not a matter of execution skill. Anyone intending to use bricks should read the entry conditions sceptically, in the spirit of the backtest honesty checklist, and record live fills separately from tested ones.
Choosing a brick size
Two approaches are common and both have a flaw. A fixed point brick is simple, comparable across history, and wrong whenever the volatility regime changes, because a size that filtered noise in a quiet stretch becomes hypersensitive when ranges expand. A brick sized from a volatility measure such as average true range adapts to the regime, at the cost that bricks from different periods no longer represent the same distance, so a line drawn across old bricks is not measuring what it appears to measure.
There is no third option that avoids the trade. The practical approach is to decide which property you need. If you want comparability over months, use a fixed size and accept that the chart becomes noisy in fast conditions. If you want a chart that stays readable through regime changes, use an adaptive size and stop treating historical brick counts as a measurement. Either way, write the choice down and leave it alone, because retuning brick size after a bad run is how a chart gets fitted to the recent past.
Brick size and the way gold moves
Gold presents a harder case than a slow instrument. It can spend hours barely moving and then cover a lot of ground in the minutes around a release. A brick small enough to show structure during the quiet stretch will produce a long cascade of bricks on a single release bar, which fills the screen with what is really one event. A brick large enough to absorb the release will print almost nothing for the rest of the day.
Spread and slippage make this worse at the small end. A brick size close to typical transaction costs produces bricks that are generated as much by quoting as by movement, and a strategy reacting to each of them is paying costs on noise. There is no published number here that holds across conditions, which is the honest answer. The workable method is to view the same stretch at a few sizes and keep the one where bricks correspond to moves you would have noticed anyway, then check it again after the next change in conditions.
Where bricks genuinely help
For structure reading, bricks are good. A series of higher brick tops and the point where that series breaks is as clean a statement of market structure on gold as you will get from any display. Horizontal levels sit naturally on brick boundaries. A pullback that holds above a prior brick line, which is the shape described in break and retest, is visible without interpretation.
They are also useful as a discipline device. A trader who exits every time a candle wick goes against them will find that bricks simply do not register most of those wicks, so there is nothing to react to. That is a genuine behavioural benefit, not a statistical one. The pairing that tends to work is bricks for structure and levels, a time based chart for timing, session and speed. Marking the levels from the brick chart and then executing on the live chart keeps the clarity without discarding the clock.
FAQ
Does a Renko chart remove noise or remove information?
Both, and they are the same operation. The chart ignores any movement smaller than one brick, which removes the small reversals people overtrade and also removes duration, speed and session. Whether that is a gain depends on whether the thing you deleted mattered to the decision you were making.
Can I set a stop loss from a Renko chart?
You can read a level from it, but the stop has to be placed at a real price. Brick boundaries are evenly spaced by construction, so the brick below is not necessarily a place the market defended. Most traders convert the brick level to an actual price and check it against a time based chart first.
What brick size should I use for gold?
There is no size that holds across conditions, because gold alternates between quiet drift and fast repricing. A fixed size stays comparable over history but becomes noisy when ranges expand. An adaptive size stays readable and makes old bricks non comparable. Choose the property you need and keep the setting stable.
Do Renko bricks repaint?
The forming brick is not settled. It appears when the distance condition is met by the current price, and price can retreat afterwards, so what you saw in real time may not match the finished chart. Only completed bricks are reliable, and by the time one is complete price has already travelled its full size.
Are Renko backtests trustworthy?
Treat them carefully. A rule based on completed bricks tests against a record in which every brick is complete, which is a luxury unavailable live. The entry price assumed by such a test is usually better than anything obtainable at the moment the brick finishes, so results tend to look stronger than live trading.
ⓘ See these ideas on real price: open the free XAUUSD live chart.