How to Trade with Renko Charts: A Brick-by-Brick Guide for Indian Markets

What a Renko Brick Actually Is

A Renko chart is built from equal-sized blocks called bricks. A new brick is drawn only when price travels a fixed distance, the brick size, beyond the close of the last brick. Time and volume are thrown away. On a normal candlestick chart you get one candle every five minutes whether price moved or not. On a Renko chart you can go an hour with zero new bricks, then print four bricks in two minutes during a sharp move. The chart measures distance travelled, not time elapsed.

This single idea is the whole tool. If the brick size is Rs 10, then nothing under Rs 10 of movement can ever appear on the chart. A green or up brick prints when price rises one full brick above the previous brick top. A red or down brick prints when price falls one full brick below the previous brick bottom. The colour stays the same until price reverses by two full bricks, because the first brick against you only fills the gap back to the prior brick, and the second one actually flips direction. That two-brick reversal rule is the reason Renko looks so clean, and it is also the reason it is slow to call a top.

A Real Brick-by-Brick Sequence on Reliance Industries

Abstract rules are forgettable, so here is an exact, illustrative brick-by-brick walk-through on Reliance Industries (RELIANCE, NSE) using a Rs 10 brick size. Assume the last printed brick is green and closed at Rs 2,900. The numbers below are illustrative and chosen to show the mechanics clearly, not a real intraday tape.

Watch carefully how price has to clear a full Rs 10 each time, and how small moves print nothing at all. The current brick top sits at Rs 2,900 and the current brick bottom sits at Rs 2,890 (the brick that printed before it).

Read step 6 again, because it is the part most guides skip. At step 4 the last green brick closed with its bottom at Rs 2,920. For a red brick to appear, price did not just need to dip below 2,920. It had to fall a full brick below the previous brick low, down to the Rs 2,910 area, a move of roughly two brick sizes (Rs 20) from the high. That is the two-brick reversal in action. The Rs 5 dip at step 5 and the Rs 7 dip at step 8 printed nothing, which is exactly how Renko filters noise. A normal 5-minute candle chart would have shown a dozen red and green candles across these same prices.

How to Choose a Brick Size on NSE Stocks

Brick size is the only setting that changes your results, so choose it deliberately. The three common methods are a fixed rupee value, a percentage of price, and an ATR-based value. ATR (Average True Range) is the most popular among Indian swing traders because it adapts the brick to how much the stock actually moves. If ATR on the daily chart of a stock is Rs 14, a Rs 14 brick means each brick roughly equals one average day of range, so a two-brick reversal is about two average days of move against you.

Percentage bricks are useful when you compare stocks at very different price levels. A Rs 10 brick is large on a Rs 200 stock but tiny on a Rs 3,500 stock like TCS. A 0.3 percent brick keeps the sensitivity comparable. Whatever you pick, the brick should be large enough that normal intraday chop does not flip it, and small enough that you are not late to every real trend. Below is a rough starting grid for liquid NSE names. These are illustrative starting points, not recommendations, and you must re-check them against the live ATR before you trade.

Trading the Sequence: A Bank Nifty Options Example with Rupees

Renko gives you the trend signal, but in Indian markets most traders express that signal through F&O, where lot sizes, premiums and taxes decide the real profit. Here is an illustrative monthly-expiry trade on Bank Nifty using a Renko signal. Lot size is 30. Suppose Bank Nifty spot is at 52,000 and your Renko chart, set to a 150-point brick, just printed its third green brick in a row, a clean uptrend signal.

You buy one lot of the 52,000 CE (call) for the nearest weekly expiry at a premium of Rs 300. Cost of one lot is 300 x 30 = Rs 9,000 plus charges. Bank Nifty then runs up and prints two more green Renko bricks. The 52,000 CE premium rises to Rs 480. You exit when a red brick warns the trend is turning. The math, illustrative only, runs as follows.

• Premium gain per unit: 480 - 300 = Rs 180.
• Gross profit on the lot: 180 x 30 = Rs 5,400.
• Brokerage: roughly Rs 20 buy + Rs 20 sell = Rs 40 (flat per order at a discount broker).
• STT on options is charged on the sell side. On a sell premium of 480 x 30 = Rs 14,400, STT at 0.15 percent is about Rs 21.60.
• Add exchange transaction charges, SEBI fee, stamp duty and 18 percent GST on brokerage and exchange charges, together roughly Rs 30 to Rs 50.
• Net profit after costs: about Rs 5,400 minus Rs 105 of total charges = roughly Rs 5,295.

Now the part that catches new traders. This Rs 2,610 is F&O profit, which is taxed as business income in India, not as capital gains. It is added to your total income and taxed at your slab rate. There is no special 20 percent STCG or 12.5 percent LTCG rate on F&O. Those capital-gains rates apply to delivery equity, where short-term gains are taxed at 20 percent and long-term gains above Rs 1.25 lakh at 12.5 percent. If you instead traded the Renko signal as delivery in the cash segment and held under a year, your profit would fall under the 20 percent STCG rate plus cess.

Why Renko Lags, and What It Costs You

The same noise filtering that makes Renko beautiful also makes it late. Because a reversal needs two full bricks, you always surrender close to two bricks of open profit before the chart admits the trend has turned. In the Reliance walk-through, the high was Rs 2,932 but the first red brick did not print until the Rs 2,910 area. That is roughly Rs 22 of give-back on a Rs 10 brick. On a leveraged F&O position, two bricks of late exit can erase a chunk of a winning trade.

Renko also hides the speed of a move. A gentle three-day climb and a violent gap up can print the exact same three green bricks. During event risk, an volatility spike around RBI policy, a Budget session, or a results day, price can blow through several bricks before you react, and the brick-based stop you planned may fill far worse than expected. This is why Renko should set the trend bias, while a time chart and an order-level stop manage the actual risk.

• Strength: removes intraday chop so the dominant trend is obvious at a glance.
• Strength: forces a mechanical, rule-based exit instead of an emotional one.
• Weakness: two-brick reversal means late entries and late exits in choppy ranges.
• Weakness: no time or volume, so it cannot tell a slow drift from a fast crash.
• Weakness: too small a brick floods you with false flips; too large a brick makes you chronically late.

Confirming Renko Signals with Other Tools

A Renko signal on its own is a trend filter, not a complete system. Pair it with one momentum read and one location read. For momentum, overlay an EMA on the Renko bricks: green bricks above a rising EMA are higher-conviction longs than green bricks below a falling EMA. For exhaustion, glance at RSI on the matching time chart. If Renko prints a fresh green brick but RSI is already above 70 and rolling over, the trend may be tiring even though the brick looks bullish.

For location, mark the day's key levels from the cash chart: previous day high and low, the opening range, and round numbers like 52,000 on Bank Nifty. A Renko breakout brick that prints right at a known resistance is far weaker than one that prints into open space. Treat Renko as the trend layer, momentum as the timing layer, and support and resistance from a normal chart as the risk layer. The three together beat any single tool.

Renko for Intraday vs Swing on Indian Markets

For intraday index trading on Nifty and Bank Nifty, traders use small bricks, often anchored to a short ATR on the 3-minute or 5-minute chart, so the chart reacts within the session. The trade-off is more flips and more whipsaw cost, which matters because every flip is two more sets of brokerage and STT. For positional or swing trades in cash equity, daily ATR bricks are common, and the chart may print only one or two bricks a week, which suits a trader who checks charts once a day.

Match the brick to your holding period and your tolerance for charges. A scalper paying flat brokerage per order needs a brick large enough that each completed trade clears its round-trip costs. A swing trader can use larger bricks and accept fewer, bigger signals. Remember that Indian weekly options expire and decay fast, so an intraday Renko signal on a weekly option is fighting theta. Monthly contracts give a Renko swing trade more room before time decay bites.

Backtesting a Renko Strategy Honestly

Renko backtests are unusually easy to fool yourself with, for two reasons. First, repainting ATR bricks make past signals look cleaner than they were live. Always backtest with a fixed brick value. Second, Renko hides time, so a backtest can hide how long your money was tied up and how many small whipsaw losses stacked up between the big winners. Count every flip as a real trade with real costs.

• Fix the brick value from a past ATR reading and never let it repaint.
• Charge realistic costs on every brick-driven entry and exit: brokerage, STT, exchange fees, stamp duty and GST.
• Include the worst case slippage on gap days, because Renko cannot warn you about gaps.
• Test across a trending phase and a choppy, range-bound phase. Renko thrives in trends and bleeds in ranges.
• Tax the net result as F&O business income for derivatives, or as 20 percent STCG for short-term cash equity, when you compare strategies.

Common Mistakes That Quietly Lose Money

The most expensive mistake is treating the close of a brick as a guaranteed fill price. Renko bricks are drawn at neat round levels, but your actual buy or sell happens at the live market price, which can be well past the brick level after a fast move. Plan your stop in rupees on the order, not on where the brick sits. The second mistake is shrinking the brick until the chart looks busy and exciting, which simply converts noise back into signals and racks up charges.

A third trap is forgetting that Renko ignores volume and time entirely, so it cannot tell you that a breakout happened on thin volume into the lunch lull versus a high-volume institutional push. Always glance at the volume on a normal chart before trusting a Renko breakout. Finally, do not trade Renko mechanically through known event days. A Budget speech or an RBI decision can gap price through several bricks at once, turning your planned two-brick risk into a far larger real loss.

Sources and Further Reading

For authoritative data and contract specifications, refer to Zerodha Varsity, NSE India and Investopedia. Always confirm current lot sizes, STT rates and tax rules on the official source before you trade. The rupee figures in this guide are illustrative examples to show the method and are not a promise of returns.

Sources and Further Reading

For authoritative data and further reading on this topic, refer to Zerodha Varsity, NSE India and Investopedia. Always confirm current rules, rates and contract specifications on the official source before you trade.