What is the long/short ratio?
Updated:
The long/short ratio is the split of open perp positions into their two sides — long notional versus short notional. Because every perp position has both a long and a short, the ratio is a measure of crowding, not of net exposure. A reading of 2:1 longs means longs hold twice the notional of shorts in that market, which tells you the trade is crowded on the long side — but not, by itself, that price is about to reverse.
What the ratio actually measures
There are two common bases for the ratio, and they can diverge:
- Notional basis — total dollar size of long positions versus short positions. This is the version that matters for liquidation pressure, because it weights by position size.
- Account basis — number of accounts long versus short. This weights every account equally, so a few large whales can be invisible in this view even when they dominate the notional.
How to read an extreme
An extreme ratio is a flag, not a trade:
- High long/short + high positive funding — longs are both crowded and paying to hold. This is the classic setup for a long squeeze if price breaks down.
- High short/long + negative funding — shorts are crowded and paying to hold. The mirror setup for a short squeeze.
- Extreme ratio + flat OI — the crowding is in existing positions, not new flows. Less likely to resolve violently than a ratio that is moving with OI.
What the ratio does not tell you
The long/short ratio does not tell you the net market position — by construction, longs and shorts always match in count. It also does not tell you whether the crowded side is right. Use it as a measure of how asymmetric the crowd has become, then pair it with funding (the cost of staying crowded) and open interest (whether the crowd is still growing) before acting.
FAQ
- Does a high long/short ratio mean price will fall?
- Not directly. A high ratio means more notional is in long positions than shorts, which can indicate crowding, but crowded longs can persist for a long time. It is a sentiment gauge, not a reversal signal on its own.
- What is the long/short ratio measured in?
- It is usually expressed as a ratio of long notional to short notional (or long account count to short account count). Always check which basis a given tool is using, since the two can tell different stories.
- Is the long/short ratio the same as open interest?
- No. Open interest is the total size of both sides combined; the long/short ratio splits that total into its two sides. They are complementary, not interchangeable.