What Is Impermanent Loss? A Practical Guide to DeFi Liquidity Pool Risk

Impermanent loss is one of the most important concepts to understand before interacting with DeFi liquidity pools. The name sounds complicated, but the idea is easier than it looks: impermanent loss happens when a liquidity pool position becomes worth less than simply holding the same tokens in a wallet.

In this article, we will explain what impermanent loss is, why it happens, how it is calculated, and how it works inside a hypothetical rBTC/DOC liquidity pool example.

The rBTC/DOC examples used below are purely educational. They do not represent real market prices, real liquidity pool conditions, real APYs, or any recommendation to use a specific asset, protocol, exchange, or DeFi strategy.

This article is for informational purposes only and should not be understood as financial advice.

Glossary

Impermanent loss: The difference between the value of a liquidity pool position and the value the same tokens would have had if they were simply held.

Liquidity pool: A pool of tokens locked in a smart contract so users can trade without needing a traditional buyer and seller order book.

Liquidity provider: A user who deposits tokens into a liquidity pool.

AMM: Automated Market Maker. A system that prices trades using formulas instead of a traditional order book.

HODL: Holding crypto assets instead of selling, trading, or depositing them into a DeFi strategy.

Price ratio: The relationship between the prices of the two assets in a liquidity pool.

Trading fees: Fees paid by users who swap tokens through a liquidity pool.

LP position: The share of the liquidity pool owned by a liquidity provider.

rBTC/DOC example: In this article, rBTC and DOC are used only as hypothetical token labels to explain impermanent loss clearly.

What Is Impermanent Loss?

Impermanent loss is the difference between two outcomes:

1. Depositing tokens into a liquidity pool.
2. Simply holding those same tokens.

If the liquidity pool position becomes worth less than the hold-only position, the difference is called impermanent loss.

For example, imagine someone deposits rBTC and DOC into a 50/50 liquidity pool. If the price of rBTC changes compared to DOC, the pool automatically adjusts the balance between both assets. Because of that adjustment, the liquidity provider may end up with a different amount of rBTC and DOC than they originally deposited.

That difference can cause the liquidity pool position to perform worse than simply holding the original tokens.

The important detail is this: impermanent loss does not always mean the user lost money compared to the initial deposit. It means the user has less value than they would have had by simply holding.

Why Is It Called Impermanent Loss?

It is called “impermanent” because the loss can change while the assets remain inside the pool.

If the price ratio between the two assets returns to the same level as when the liquidity was deposited, the impermanent loss may disappear.

However, if the liquidity provider withdraws while the price ratio is still different, the loss becomes realized.

That is why impermanent loss is often easier to understand as a relative loss or opportunity cost. It compares the liquidity pool result against the result of simply holding.

How Impermanent Loss Works in a Liquidity Pool

Most simple liquidity pool examples use a 50/50 pool. That means the user deposits equal value of two tokens.

In our educational example, imagine a liquidity provider deposits:

The total hypothetical deposit value is:

200,000 DOC

At the moment of deposit, the user has equal value on both sides of the pool:

• 50% in rBTC
• 50% in DOC

Now imagine the price of rBTC changes. The liquidity pool does not keep the user’s original token amounts fixed. Instead, the pool adjusts as traders interact with it.

This is where impermanent loss appears.

rBTC/DOC Example: If rBTC Doubles

Let’s continue with the same hypothetical numbers.

Initial position:

Initial total value:

200,000 DOC

Now suppose rBTC doubles in price.

New hypothetical price:

1 rBTC = 200,000 DOC

If the user simply held the tokens, the position would be:

The HODL value would be:

300,000 DOC

But inside a liquidity pool, the position changes. Because the pool rebalances, the liquidity provider no longer has exactly 1 rBTC and 100,000 DOC.

The LP position could approximately represent:

The liquidity pool position is now worth approximately:

282,840 DOC

Now compare both outcomes:

Difference:

300,000 DOC - 282,840 DOC = 17,160 DOC

That difference is the impermanent loss.

In percentage terms, the liquidity pool position is approximately 5.72% lower than the HODL position, before considering trading fees or any other variables.

Important Clarification: The Position Still Increased in Value

This is where many people get confused.

In the example above, the original deposit was worth:

200,000 DOC

After rBTC doubled, the liquidity pool position was worth:

282,840 DOC

So the LP position increased in value.

However, simply holding would have produced:

300,000 DOC

So impermanent loss does not necessarily mean the user lost money compared to the starting point. It means the liquidity pool position performed worse than holding the same assets.

That is why impermanent loss is best understood as a comparison.

rBTC/DOC Example: If rBTC Falls

Impermanent loss can also happen when the price falls.

Let’s start again with the same hypothetical deposit:

Initial total value:

200,000 DOC

Now suppose rBTC falls by 50%.

New hypothetical price:

1 rBTC = 50,000 DOC

If the user simply held the tokens, the position would be:

The HODL value would be:

150,000 DOC

But in the liquidity pool, the position is rebalanced. The LP position could approximately represent:

The liquidity pool position is now worth approximately:

141,420 DOC

Now compare both outcomes:

Difference:

150,000 DOC - 141,420 DOC = 8,580 DOC

Again, the liquidity pool position performs worse than simply holding the original assets.

Why Impermanent Loss Happens

Impermanent loss happens because liquidity pools rebalance automatically.

In a simple 50/50 AMM pool, the pool tries to maintain a relationship between the two assets. When one asset becomes more expensive compared to the other, traders interact with the pool until the pool price reflects the new market price.

As this happens, the liquidity provider’s asset balance changes.

In the rBTC/DOC example:

• If rBTC rises, the pool ends up with less rBTC and more DOC.
• If rBTC falls, the pool ends up with more rBTC and less DOC.

That automatic rebalancing is what creates impermanent loss.

The user does not keep the exact same amount of each token. They keep a share of the pool, and the pool’s internal balance changes as prices move.

Impermanent Loss Formula

For a standard 50/50 liquidity pool, the common impermanent loss formula is:

Impermanent Loss = 2 × √price ratio / (1 + price ratio) - 1

The price ratio is:

New price ÷ original price

For example, if rBTC doubles against DOC:

Price ratio = 2

The calculation is:

2 × √2 / (1 + 2) - 1

That equals approximately:

-5.72%

The negative sign means the liquidity pool position is worth around 5.72% less than simply holding the original tokens.

This formula applies to a simplified 50/50 constant product AMM model. Different pool designs may behave differently.

Impermanent Loss Table

Here is a simple reference table for a hypothetical 50/50 liquidity pool before trading fees:

The larger the price movement between the two assets, the larger the impermanent loss.

The direction of the movement is not the main issue. What matters is how much the price ratio changes.

Does Impermanent Loss Only Happen When Prices Go Down?

No.

Impermanent loss can happen when prices go up or down.

If rBTC rises strongly compared to DOC, the liquidity pool position can underperform holding.

If rBTC falls strongly compared to DOC, the liquidity pool position can also underperform holding.

This is because impermanent loss is caused by price divergence between the two assets, not only by a price decrease.

That is one of the most important points to understand. A token can rise in price, and the liquidity pool position can still suffer impermanent loss compared to holding.

Impermanent Loss vs Regular Loss

Impermanent loss and regular loss are not the same thing.

A regular loss means the value of the position is lower than the original deposit.

Impermanent loss means the position is lower than the value of simply holding the same assets.

For example:

In many impermanent loss examples, the user may still be in profit compared to the original deposit. The issue is that the user would have done better by holding.

Trading Fees and Impermanent Loss

Trading fees can change the final result.

Liquidity providers may receive a portion of the fees generated by trades in the pool. These fees can reduce or offset impermanent loss.

However, fees are not guaranteed to fully compensate for impermanent loss.

A simplified way to think about the final result is:

Final LP result = pool value + trading fees - impermanent loss - other costs

For example, in a hypothetical rBTC/DOC pool:

• If impermanent loss is 5.72%
• And trading fees add 3%
• The LP position may still underperform holding

But if:

• Impermanent loss is 5.72%
• And trading fees add 8%
• The LP position may perform better than holding

This is only a simplified educational explanation. Real results depend on pool design, trading volume, price movement, fees, timing, and other variables.

Why High APY Can Be Misleading

High APY does not automatically mean a liquidity pool is profitable.

A pool may display a high APY, but the final outcome can still be affected by:

• Impermanent loss
• Token price movements
• Trading volume
• Reward token volatility
• Smart contract risk
• Deposit and withdrawal timing
• Transaction costs
• Pool design

This is why impermanent loss is important. Without understanding it, a user may see a high APY and assume the strategy is simple, when the actual result depends on several moving parts.

In educational terms, the headline yield is only one part of the equation. The other part is how the value of the LP position changes compared to holding.

Why Volatility Matters

Impermanent loss becomes more significant when the two assets in a pool move differently.

In the hypothetical rBTC/DOC example, rBTC is treated as the changing asset and DOC as the stable unit of account. If rBTC moves sharply up or down, the price ratio changes, and impermanent loss can appear.

In general, pools with highly volatile pairs tend to have higher impermanent loss risk than pools where both assets move in a similar way.

For example:

This does not mean one type of pool is good or bad. It simply means the price relationship between the assets matters.

Can Impermanent Loss Disappear?

Yes, impermanent loss can decrease or disappear if the price ratio returns to the original level.

Imagine this hypothetical sequence:

1. rBTC starts at 100,000 DOC.
2. rBTC rises to 200,000 DOC.
3. Impermanent loss appears.
4. rBTC later returns to 100,000 DOC.
5. The price ratio is back where it started.

In this simplified case, the impermanent loss caused by the price movement may disappear if the liquidity remains in the pool.

However, if the user withdraws while the price ratio is still different, the impermanent loss becomes realized.

That is why the timing of withdrawal matters in liquidity pool outcomes.

Is Impermanent Loss Always Bad?

Impermanent loss is not automatically good or bad. It is a risk that comes with providing liquidity.

In some scenarios, trading fees may compensate for impermanent loss. In other scenarios, they may not.

The educational point is not that liquidity providing is always worse than holding. The point is that liquidity providing and holding are different strategies with different outcomes.

Holding keeps the original token amounts.

Providing liquidity gives exposure to a pool position that changes over time.

That difference is exactly why impermanent loss exists.

HODLing vs Providing Liquidity

Here is a simple comparison:

This is why liquidity pool positions can feel unintuitive at first.

The user deposits two tokens, but the pool does not preserve the exact original balance. It preserves a share of the pool.

Common Beginner Mistakes

Thinking impermanent loss only happens when losing money

Impermanent loss is measured against holding, not only against the original deposit.

Looking only at APY

APY does not show the full result. Impermanent loss, fees, token movement, and timing also matter.

Assuming fees always compensate for impermanent loss

Fees can help, but they do not always fully offset the difference.

Forgetting that pools rebalance

A liquidity provider owns a changing pool position, not a fixed amount of each token.

Confusing unrealized and realized impermanent loss

Impermanent loss changes while the position remains in the pool. It becomes realized when the liquidity is withdrawn.

Ignoring the price ratio

Impermanent loss depends on how much the price relationship between the two assets changes.

How to Think About Impermanent Loss Before Using a Pool

Before analyzing any liquidity pool, it helps to ask educational questions like:

• What are the two assets in the pool?
• How much can their price ratio change?
• Is one asset much more volatile than the other?
• Are trading fees relevant in this pool?
• Is the APY based on real trading activity or temporary rewards?
• What happens if one asset doubles?
• What happens if one asset falls by 50%?
• How does the LP result compare to simply holding?
• What pool model is being used?
• Are there additional risks beyond impermanent loss?

These questions do not tell anyone what to do. They simply help explain why liquidity pool returns can be different from holding tokens.

Key Takeaways Before Evaluating Liquidity Pools

Impermanent loss is one of the core mechanics behind AMM liquidity pools. It appears when the price ratio between two deposited assets changes and the liquidity pool position ends up worth less than simply holding the same tokens.

The hypothetical rBTC/DOC example shows this clearly. If rBTC doubles, the LP position can still increase in value, but it may increase less than the HODL position. If rBTC falls, the LP position can also underperform holding because the pool rebalances into a different token mix.

That is why impermanent loss should not be understood as a simple “loss of money.” It is better understood as a comparison between two paths: holding tokens or providing liquidity.

A liquidity pool position may be affected by price movement, trading fees, pool design, timing, volatility, and other variables. Understanding impermanent loss helps users read DeFi examples more clearly and avoid confusing headline APY with actual comparative performance.