What is an order block in trading?
In one line: An order block is the last opposite-colored candle before a strong move. Some traders watch that area because price often reacts when it returns there.
A simple example
On a 1-hour chart of EUR/USD, price drifts down. The last red candle runs from 1.0832 down to 1.0815. Then three big green candles launch price to 1.0890, closing above the last high.
That last red candle, roughly 1.0815 to 1.0832, is the order block. It's the spot where the strong push up began. The idea is that big buyers were placing orders there. If price comes back to that zone, some of them may buy again.
For a move down, it's the mirror image: the last green candle before a strong drop.
What makes one worth watching
Not every candle before a move counts. Traders usually look for:
- A strong move away. Big candles that leave quickly, not a slow drift.
- A close past a level. The move closed past the last turning point, a Break of structure.
- A first return. The first time price comes back tends to matter most.
Why it matters
An order block gives you a specific area to wait for, instead of chasing a move that already happened. If it holds, it's a clear spot to plan an entry, with a Stop loss just past the far side of the zone.
It's a zone, not a promise. Price can slice straight through it. That's why the stop matters, and why size comes from the stop, not the other way around. The position size calculator handles the math.
A common mistake
Seeing order blocks on every candle. Every move starts somewhere, so you can draw one almost anywhere. Without a strong move and a close past a level, it's just a candle. Keep only the ones tied to a clear change on the chart.
Another mix-up is treating order blocks and Supply and demand zones as totally different tools. They're close cousins. See order block vs supply and demand zone and the full walkthrough in order blocks explained.
Questions
Do order blocks really work?
They're one way to mark where a strong move started. Price reacts at some and runs through others. Treat them as places to watch, with a stop, never as sure things.
Is an order block a real order?
Not one you can see. It's a chart idea: a guess that large orders were placed there, based on how price moved.
Which timeframe is best for order blocks?
Ones on bigger charts, like the 4-hour or daily, tend to matter more. Use smaller charts to time an entry inside them.
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