Renko Charts Explained: Price Bricks Without Time Noise
A Renko chart plots a new brick only when price moves a fixed amount, so nothing appears on screen during a quiet session no matter how long it lasts. Time is removed from the horizontal axis entirely, which strips out the small oscillations that make candlestick charts look busy and leaves a clean staircase of direction.
Every Renko brick represents the same amount of price movement, and a reversal brick requires twice that movement, which is why the chart looks so much smoother than a candlestick chart of the same stock. The name comes from renga, the Japanese word for brick.
That smoothness has a price, and the honest version of this topic spends as much time on what Renko throws away as on what it reveals. Read on for the construction rules, a numeric walkthrough, the brick size decision, and where the chart will mislead you.
The construction rules, stated plainly
Three rules govern the whole chart.
First, you choose a brick size in rupees, points or a percentage. Second, a brick in the same direction prints when price moves one brick size beyond the last brick’s close. Third, an opposite brick prints only when price moves two brick sizes against the last brick, since it must cross the existing body before building on the other side.
Bricks are drawn diagonally, one column right and one step up or down. No partial bricks, no wicks in the traditional version, no gaps. A stock that gaps up by three brick sizes simply prints three up bricks.
Traditional Renko uses closing prices only. Some platforms offer a high and low variant that prints more bricks, so check your platform’s default.
Worked example: a Rs 1,000 stock with a Rs 10 brick
Set the brick size to 1% of Rs 1,000, so Rs 10. Suppose the last brick is an up brick from Rs 1,010 to Rs 1,020. Watch what follows.
| Price reaches | Arithmetic | Does a brick print? | Chart after |
|---|---|---|---|
| Rs 1,027 | Needs 1,030 for the next up brick | No | Unchanged |
| Rs 1,031 | 1,030 reached, brick 1,020 to 1,030 prints | Yes, one up brick | Extra Rs 1 ignored |
| Rs 1,022 | Fall of 9, reversal needs 20 | No | Unchanged |
| Rs 1,011 | Fall of 20 from 1,030, brick 1,020 to 1,010 prints | Yes, one down brick | First red brick |
| Rs 1,052 | Rise of 41, four bricks from 1,010 to 1,050 | Yes, four up bricks | All in one tick |
Two things are worth pulling out of that table.
The reversal threshold is genuinely double. From the top of a Rs 1,030 up brick, price must fall to Rs 1,010 before one red brick appears. A pullback to Rs 1,015, a 1.5% fall, leaves the chart looking bullish. That is the filter working, and also the lag.
The four brick burst matters too. All four printed on one tick and share a timestamp, so reading them as four periods of steady buying misreads the chart.
How do you choose the brick size?
This is the only setting that matters, and it changes the chart completely. Halve it and you roughly quadruple the number of bricks.
Fixed brick size
You type in a rupee or point value. Predictable, easy to backtest, historical bricks stay stable. The drawback: a value suited to a Rs 200 stock is useless on a Rs 4,000 stock, and one suited to a calm market prints noise in a volatile one.
Percentage brick size
The brick is a percentage of price, so it scales as the stock rises. Useful on long term charts, where a fixed rupee brick becomes absurdly small at higher prices.
ATR based brick size
The platform sets the brick to the Average True Range over a lookback, often 14 periods. It adapts to volatility, which sounds ideal. The catch is rarely mentioned: ATR changes as new data arrives, so the brick size changes and the platform redraws history. Bricks you saw yesterday may be gone today, which makes ATR Renko backtests unreliable.
Keep ATR bricks for live reading and fixed bricks for anything you test. A refresher on how ATR measures volatility helps here.
What Renko genuinely does well
- Trend isolation. A run of same coloured bricks is unambiguous, and choppy action compresses into very few bricks.
- Cleaner trendlines. With no wicks or gaps, a line connecting brick corners is less arbitrary than one drawn across candle shadows.
- Clearer horizontal levels. Prices where bricks repeatedly stall stand out, which suits the way support and resistance zones are identified.
- Less screen anxiety. Nothing prints unless price moves, so an hour of drift leaves the chart unchanged rather than printing sixty candles inviting action.
- Simple stops. The reversal brick level is a defined price, known in advance.
What Renko hides from you
All of these follow from removing time.
You cannot see how long a move took. Ten up bricks in four minutes and ten over three weeks look identical, and those are very different conditions.
Gaps vanish. An overnight gap down on bad news becomes a tidy run of red bricks, erasing what a gap trader wants. Volume is dropped or lumped per brick, so volume confirmation becomes awkward.
Highs and lows are truncated. A spike that reversed hard inside a brick leaves no trace, so Renko can show a calm uptrend on a day that felt violent.
Signals lag. The two brick rule means giving back at least two brick sizes before the chart admits the trend changed: Rs 20 above, 2% of price.
A simple way to trade Renko without fooling yourself
- Pick a fixed brick size near the instrument’s typical daily range divided by three, then leave it alone. Changing it after a losing trade is curve fitting.
- Define the trend as three or more consecutive same coloured bricks. Two is not a trend, only the reversal threshold being met.
- Enter only in the direction of the brick colour, on the first brick continuing the run after a one brick pause.
- Set the stop where two opposing bricks would print, not at a percentage you picked.
- Confirm on a candlestick chart first, checking volume and whether the move happened in one gap.
- Size off the stop distance in rupees, since brick size and risk are linked.
A plain risk note: Renko is a way of drawing price, not a forecasting tool. Smoother charts feel more certain, and that feeling is the hazard. Whipsaw markets still produce alternating single bricks, each able to trigger a losing trade.
Renko is a filter applied to price; candlesticks are the record of it. Read trend on Renko and context on candlesticks. The primer on what technical analysis actually claims is worth revisiting here.
Frequently Asked Questions
Can I use Renko charts for intraday trading in Indian markets?
Yes, and small brick sizes are common on Nifty and Bank Nifty. Two cautions. The underlying data timeframe still matters, since Renko built on one minute closes differs from Renko built on tick data. And the opening gap is invisible, so keep a candlestick chart alongside.
Do Renko charts repaint?
Fixed brick Renko does not repaint once a brick closes. ATR based Renko effectively does, because the brick size recalculates as new bars arrive and the platform redraws history. If your backtest depends on exact historical bricks, use a fixed brick size.
What brick size should I use for Nifty?
There is no correct answer, only a method. Take the index’s typical daily range over recent weeks, divide by three, and round to a convenient number of points. Check that the chart then shows roughly five to fifteen bricks on an average day. Fewer means you will be late; many more means you have rebuilt the noise you set out to remove.
Are Renko charts the same as Heikin Ashi?
No. Heikin Ashi keeps time on the x axis and averages open, high, low and close, so one candle still equals one period. Renko discards time and one brick equals a fixed price move. Heikin Ashi shows when; Renko shows only how far.
Can indicators be applied to Renko charts?
They can, and the output needs care. A moving average on Renko averages brick closes, not periods, so its value depends on brick size rather than elapsed time. It still marks trend direction, but comparing it with a time based average on the same instrument is not like for like.
Key Takeaways
- One brick equals one fixed price move. A reversal brick needs two brick sizes of adverse movement, the source of the smoothing and the lag.
- Time and volume are absent. Four bricks can print on one tick and share a timestamp.
- Brick size is the only real setting: fixed bricks are testable, ATR bricks adapt but redraw history.
- Set stops at the two brick reversal price rather than an arbitrary percentage; the chart already defines where the structure breaks.
- Use Renko for trend and levels, and keep candlesticks for context. Replacing one with the other loses information you need.
