Direct Answer
Renko charts plot price movement using fixed-size bricks with no time axis at all, a new brick forms only when price moves by a predetermined amount (the brick size), regardless of how much time that takes. This filters out time-based noise and consolidation completely, but means the x-axis has no fixed relationship to calendar time, which can make comparing two Renko charts side by side misleading if that's forgotten.
Key Takeaways
- A new brick forms only when price clears the brick-size threshold from the last brick's boundary, there is no fixed time interval per brick.
- Brick size is commonly set as a fixed dollar/point amount, or calculated adaptively from ATR (Average True Range).
- Reversing direction typically requires price to move 2x the brick size, specifically to filter out minor pullbacks from flipping the chart.
- Two Renko charts of the same instrument with different brick sizes can look completely different, since brick size is the single parameter controlling how much noise gets filtered.
- Because bricks have no fixed time relationship, a Renko chart cannot be used to read elapsed time between moves the way a time-based candlestick chart can.
How Are Renko Bricks Constructed?
A Renko chart has no time axis. A new brick is added only when price moves by a predetermined fixed amount, the brick size, in one direction from the last brick's boundary. Bricks form one at a time in the trend direction as long as price keeps clearing each successive brick-size threshold, regardless of how many minutes, hours, or days that takes. If no threshold is cleared, no new brick appears, so a Renko chart naturally omits sideways, low-movement periods entirely rather than plotting them as flat, uninformative candles.
Choosing a brick size
Brick size is the single parameter that controls how much price noise a Renko chart filters out, and it's typically set one of two ways:
- Fixed dollar or point amount, a constant brick size (for example, $2 on a stock, or a fixed number of pips on a currency pair) that never changes. This is simple and produces a fully consistent chart over time, but a brick size chosen for a calm period can filter too little during a volatile stretch, or too much during a quiet one.
- ATR-based (adaptive) brick size, the brick size is recalculated periodically from the instrument's Average True Range, so it grows during high-volatility periods and shrinks during low-volatility ones. This keeps the filtering proportionate to current conditions, but means the brick size itself is a moving target that has to be tracked and disclosed alongside the chart, since two ATR-based charts calculated on different lookback windows won't produce identical bricks.
The reversal rule
To reverse direction, price typically must move twice the brick size, not just one brick size, from the last brick's close. This higher bar exists specifically to filter out minor pullbacks that would otherwise flip the chart's direction on every small counter-move within an ongoing trend. Once the 2x threshold is cleared, the reversal move is drawn as bricks in the new direction, and continuation from that point only requires the normal single brick-size threshold again, the 2x hurdle applies only to the moment of reversal, not to every brick after it.
Common mistake
The common mistake is reading the horizontal spacing of Renko bricks as if it represented elapsed time, the way it would on a candlestick chart. It doesn't. Two adjacent bricks could be five minutes apart or five weeks apart, the chart gives no visual indication either way, so comparing two Renko charts of different instruments or time windows side by side, and assuming their brick counts reflect comparable durations, is a direct misreading of what the chart actually encodes.
Worked Example: Renko Bricks From a Synthetic Price Series
Illustrative numbers, not live market data.
Assume a brick size of $2.00, which sets the reversal threshold at 2 × $2.00 = $4.00. The price series below is a sequence of hypothetical ticks, not tied to any fixed time interval, that's the point of a Renko chart. Brick boundaries sit at $2.00 increments from the starting reference of $100.00: $100, $102, $104, $106, $108, and so on.
| Tick | Price | Result |
|---|---|---|
| 1 | $100.00 | Starting reference, no brick yet |
| 2 | $102.30 | Up brick forms: $100 → $102 (cleared the $2.00 threshold) |
| 3 | $104.60 | Up brick forms: $102 → $104 |
| 4 | $106.90 | Up brick forms: $104 → $106 |
| 5 | $105.10 | No brick, a pullback to $105.10 is only $1.80 below the last brick's $106.90 high and doesn't clear the $4.00 reversal threshold ($106 − $4 = $102) |
| 6 | $108.40 | Up brick forms: $106 → $108 (continuation resumes) |
| 7 | $103.50 | Reversal: $103.50 clears $108 − $4.00 = $104.00, triggering two down bricks: $108 → $106, then $106 → $104 |
| 8 | $101.00 | Down brick forms: $104 → $102 (continuation of the new down move, only the normal $2.00 threshold required) |
Walking through the logic: ticks 2 through 4 each clear a fresh $2.00 threshold above the last brick, so three up bricks print in a row ($100→$102, $102→$104, $104→$106). Tick 5's pullback to $105.10 is real price movement, but at only $1.80 off the last brick's high it falls well short of the $4.00 reversal threshold, so the chart shows nothing for it. This is the noise-filtering the whole method is built around. Tick 6 resumes the uptrend and prints a fourth up brick. Tick 7 is the reversal: a drop to $103.50 clears the full $4.00 threshold measured from the last brick's $108 close, so the chart doesn't just print one down brick, it prints two, walking the price back down through both the $106 and $104 levels it skipped on the way. Tick 8 continues the new downtrend with a single ordinary brick, since continuation only needs the standard $2.00 threshold once a direction is established.
Final brick count for this series: four up bricks ($100→102, 102→104, 104→106, 106→108) followed by three down bricks ($108→106, 106→104, 104→102), seven bricks total, even though the raw price series had eight distinct ticks and one of them (tick 5) produced no brick at all.
Common mistake
The common mistake in a worked example like this is assuming a reversal always produces exactly one brick in the new direction. As tick 7 shows, because the reversal threshold is 2x the brick size, a reversal that just barely clears the threshold can and typically does print more than one brick at once, the chart is "catching up" through the price levels the 2x rule required it to skip over.
Why Choose a Time-Filtered Chart Like Renko?
Renko's entire design goal is removing the influence of time and minor price noise so that only meaningful, threshold-clearing movement is visible. A trader trying to identify a clean trend without the visual clutter of small back-and-forth chop during consolidation may find a Renko chart easier to read for that specific purpose than a time-based candlestick chart covering the same period. The tradeoff is that all of the information Renko discards, exact timing, volume-per-period, intraday volatility inside a single brick, is genuinely gone from the chart, not just visually simplified.
How is brick size chosen for a Renko chart?
The two common approaches are a fixed dollar or point amount (a constant brick size that never changes) and an ATR-based brick that recalculates periodically so the brick size adapts to the instrument's current volatility. A fixed brick size is simpler and fully consistent over time; an ATR-based brick stays proportionate as volatility rises or falls but means the brick size itself is a moving target that must be tracked alongside the chart.
What is the Renko reversal rule?
To reverse direction, price typically must move twice the brick size, not just one brick size, from the last brick's close. This higher bar exists specifically to filter out minor pullbacks that would otherwise flip the chart's direction on every small counter-move. Once the 2x threshold is cleared, the reversal move is drawn as bricks in the new direction, and continuation from that point only requires the normal single brick-size threshold again.
Misconceptions Versus Reality
| Misconception | Reality |
|---|---|
| Renko brick spacing reflects elapsed time, like candlestick spacing does | Renko has no time axis, adjacent bricks can represent minutes or weeks with no visual distinction, so brick position never conveys duration |
| A reversal always produces exactly one brick in the new direction | Because the reversal threshold is 2x the brick size, a reversal move often clears more than one brick's worth of distance at once and prints multiple bricks immediately, as the worked example's tick 7 shows |
| Any small pullback shows up as a change in direction on a Renko chart | The 2x reversal threshold is specifically designed to filter out pullbacks smaller than that threshold, tick 5 in the worked example moved price but produced no brick at all |
| Two Renko charts of the same instrument should look the same | Brick size is a free parameter chosen by the chart builder; different brick sizes filter different amounts of noise and can produce visibly different chart shapes from identical underlying price data |
Risks, Limitations, and Exceptions
- Renko discards exact timing entirely, it cannot be used to read how much time elapsed between two price moves, and comparing two Renko charts side by side without accounting for this can be genuinely misleading.
- Brick size is a free, subjective parameter. A brick chosen too small reproduces most of the noise a trader was trying to filter out; a brick chosen too large can hide meaningful moves entirely, and there is no single "correct" brick size for every instrument or purpose.
- Because a brick only appears after price clears its threshold, a Renko chart is inherently lagging relative to the raw tick-by-tick price, the actual threshold-crossing print, not the brick itself, is what a real order would have executed against.
- ATR-based (adaptive) brick sizing introduces its own parameter sensitivity: the ATR lookback window used to calculate brick size affects the resulting chart, so two providers using different ATR windows can produce different Renko charts from identical raw data.
- Renko intentionally omits volume-per-period and intraday volatility information that a standard OHLCV candlestick preserves.
- The worked example in this guide uses illustrative, deterministic numbers, not live market data.
The Brick Is Not the Price You Would Have Got
A brick appears only once price has cleared the threshold, which means the brick boundary is a rendering of an event rather than a record of where a trade would have filled. The actual print that crossed the threshold is the price a real order would have met, and it can sit some distance from the tidy brick edge on the chart. Backtesting against brick boundaries quietly assumes fills at prices the construction invented.
Brick size is the one parameter, and it decides how much of the market you are choosing not to see. Too small and most of the noise you were filtering comes back; too large and genuine intermediate moves vanish inside single bricks. There is no correct value, and two charts of the same instrument with different sizes can support opposite conclusions.
Anchoring brick size to Average True Range makes the setting adaptive and adds its own parameters, since the ATR period and multiplier are now inputs too. Adaptive is not the same as automatic, and the chart still reflects choices you made.
Keep the time cost in view as well. Renko discards elapsed period entirely, so it cannot tell you whether a run of bricks took two days or two quarters, and comparing two Renko charts side by side without holding that in mind is one of the more reliable ways to misread the format.
Frequently Asked Questions
How are Renko bricks constructed?
A Renko chart has no time axis. A new brick is added only when price moves by a predetermined fixed amount, the brick size, in one direction from the last brick's boundary. Bricks form one at a time in the trend direction as long as price keeps clearing each successive brick-size threshold, regardless of how many minutes, hours, or days that takes. If no threshold is cleared, no new brick appears, so a Renko chart naturally omits sideways, low-movement periods entirely.
How is brick size chosen for a Renko chart?
The two common approaches are a fixed dollar or point amount (e.g. a $2 brick on a stock, or a fixed number of pips or ticks) and an ATR-based (Average True Range) brick that recalculates periodically so the brick size adapts to the instrument's current volatility. A fixed brick size is simpler and fully consistent over time; an ATR-based brick stays proportionate as volatility rises or falls but means the brick size itself is a moving target that must be tracked alongside the chart.
What is the Renko reversal rule?
To reverse direction, price typically must move twice the brick size, not just one brick size, from the last brick's close. This higher bar exists specifically to filter out minor pullbacks that would otherwise flip the chart's direction on every small counter-move. Once the 2x threshold is cleared, the reversal move is drawn as bricks in the new direction, and continuation from that point only requires the normal single brick-size threshold again.
What is the difference between fixed brick size and ATR-based Renko?
A fixed brick size keeps every brick the same height for the life of the chart, so history never changes once drawn. An ATR-based brick recalculates its height from a rolling volatility measure, which means the brick size at the right edge differs from the one used earlier and, in many implementations, the whole chart is redrawn with the current value. The second version is more adaptive and less stable as a historical record.
Does a Renko chart repaint?
The forming brick is provisional until price completes it, so the right edge of the chart can change while you are watching it. ATR-based Renko goes further: because the brick size itself is recalculated, previously printed bricks can be redrawn at different levels when the volatility input updates. A backtest run on an ATR Renko series can therefore be reading brick boundaries that were not knowable at the time.
Why can a large price move show up as a single Renko brick?
Because only completed brick multiples print. A move of one and a half bricks prints one brick and leaves the remainder pending until price extends further or retraces. Movement below the brick threshold is invisible by design, which is the filtering the chart exists to provide, and also the reason a Renko chart cannot answer questions about the size of the moves it filtered out.
Should Renko bricks be built from closes or from highs and lows?
Close-based construction is the common default and only checks one price per period. High and low construction checks whether the period extreme was enough to complete a brick, which registers moves the close-based version misses entirely. The same data therefore produces more bricks under the second method. Neither is the standard, so the method has to be stated alongside the brick size.
Does a Renko chart show volume?
Platforms usually display something in a volume pane, but what it represents is a construction choice rather than a market fact. A brick is not a time period, so the volume attached to it is whatever the platform decided to aggregate across the ticks or bars that produced it. Comparing volume across bricks compares aggregates over unequal and unstated spans of time.
Can a Renko chart tell you how long a trend lasted?
No. A run of ten bricks measures distance travelled, in units of the brick size, and says nothing about whether that took an hour or a quarter. If duration matters to the question you are asking, it has to come from the underlying time-indexed data. This is the same limitation that applies to Kagi and point and figure charts, all of which trade the time axis for a movement axis.
References
Renko construction follows the long-standing, publicly documented brick-and-threshold method used across technical-analysis literature and charting platforms. Key reference sources include:
- CME Group, Charting Techniques Education: cmegroup.com/education: exchange-published overview of non-time-based charting methods including brick and point-based construction.
- Nasdaq, Charting and Technical Analysis Resources: nasdaq.com/market-activity: reference for standard raw price data conventions this construction is built on.
The worked example in this guide uses a clearly labeled, deterministic illustrative dataset, not live market data. This content was reviewed by the Swoopr Editorial Team in August 2026.