What is an order block? A plain-English guide for NSE traders

An order block is a price zone on a chart: the range of the last candle that moved against the trend just before a strong move with it. Traders watch these zones because price often comes back to them, and what it does there says something about who is in control.

This guide explains the idea from scratch. If you already know it, how Live Flow finds order blocks gives the exact rule StoxGud uses.

The idea in one picture

Read the picture from left to right:

1. Price drifts lower: a run of red candles.
2. The last red candle before the turn is the order block. Its low and high mark the zone.
3. The next candle is a strong green candle that closes above the recent highs. Something changed: buyers took over quickly and decisively.
4. Later, price comes back into the zone. Many traders watch that moment.

Why would price come back to it?

The usual explanation is about large orders. A big buyer rarely fills a whole order at one price; it buys in pieces. The strong move up often happens when that buying overwhelms the sellers. If the buyer did not fill everything, the same price area may attract buying again when price returns. So the zone is a footprint of where buyers last stepped in with force.

Nobody can see those orders directly on an exchange chart, so treat this as a reason the idea makes sense, not proof that a particular zone will hold.

Bullish and bearish order blocks

• A bullish order block is the last down candle before a strong move up. It sits below price and is watched as a possible area of support.
• A bearish order block is the mirror image: the last up candle before a strong move down. It sits above price and is watched as a possible area of resistance.

Bullish vs bearish order blocks covers both in more detail.

What makes a "good" order block?

Different traders use different rules, but most agree on three things:

• A strong move away. The candle after the block should travel far, compared with the stock's usual candle size. A tiny move away is just noise.
• A break of structure. The move should take out the recent highs (or lows, for a bearish block). That is what shows the balance actually changed.
• Still untouched, or not broken. A block is no longer valid once price closes through its far side (below the low of a bullish block, above the high of a bearish one).

Order blocks and time frames

The same idea works on any candle size: 1-minute, 5-minute, 15-minute, hourly or daily. Blocks on bigger candles cover wider price ranges and take longer to form; blocks on 1-minute candles appear and break many times a day. Intraday traders often look at a few time frames together, for example a 15-minute block with 1-minute blocks inside it.

The honest limits

• Order blocks are not signals. A zone is an area to watch, not a reason on its own to buy or sell.
• Many blocks fail. Price can slice straight through a zone, especially on news or in a strongly trending market.
• Rules differ. Two traders can mark different blocks on the same chart. A fixed rule, like the one Live Flow uses, at least makes the zones consistent.
• Risk first. If you use zones at all, decide in advance where the idea is wrong (usually just beyond the far side of the block) and how much you are willing to lose.

Seeing order blocks on NSE stocks

Marking blocks by hand on 200-odd F&O stocks is slow. Live Flow applies one fixed rule to every NSE F&O stock as the session runs, draws the blocks on each stock's card and chart, and lists every new block on the order block alerts page.

Next: bullish vs bearish order blocks · how Live Flow finds order blocks.