Why this matters
On a centralized exchange, a large market order might eat through several price levels, but you can see the order book depth before you trade. On a decentralized exchange using an automated market maker, there is no order book. The price you receive is determined entirely by the ratio of reserves in the liquidity pool, and your trade itself shifts that ratio. The larger your trade relative to the pool, the worse your execution price becomes. This difference between expected and actual price is slippage, and it can silently eat into profits on every swap.
Most DEX interfaces let you set a maximum slippage tolerance, usually defaulting to 0.5 percent, but few traders verify whether their trade size will actually stay within that bound before signing the transaction. If the price impact exceeds your slippage setting, the transaction reverts and you waste gas fees for nothing. This calculator lets you plug in your trade size, the pool reserve depth, and your slippage tolerance to see the projected price impact before you commit any funds.
Understanding the relationship between trade size and pool liquidity is essential for anyone trading on Uniswap, SushiSwap, PancakeSwap, or any other constant-product AMM. A small trade in a deep pool might have negligible impact, while the same absolute size in a shallow pool could cause several percent of slippage. The calculator uses the standard x times y equals k model so the results match what the smart contract will actually execute.
Reference table
| Input | Description |
|---|---|
| Trade size | Amount of tokens you intend to swap |
| Pool reserve | Total liquidity depth of the token pair in the pool |
| Slippage tolerance | Maximum acceptable price deviation, typically 0.5 to 5 percent |
| Price impact | Calculated percentage the trade moves the pool price |
| Execution status | Whether the trade stays within your slippage limit or would revert |
How to use it
Enter the amount of tokens you want to swap in the trade size field.
Enter the pool reserve size, which represents the total liquidity depth available.
Set your maximum slippage tolerance, such as 0.5 percent for a standard trade.
Read the calculated price impact percentage and check whether the trade executes within your slippage limit.
Testing your result
Cross-check the calculator output against the slippage estimate shown by your DEX interface before confirming a trade. If the numbers are close, the model is accurate for your parameters. For a deeper test, execute a small test trade and compare the actual received amount against the calculator prediction. Discrepancies can arise from fees, which the calculator models separately from price impact. If your trade size is very close to the boundary of your slippage tolerance, consider reducing the trade amount to add a safety margin.
Common mistakes
Entering the total pool TVL instead of the reserve amount of the specific token you are trading against.
Setting slippage tolerance too low for a large trade relative to pool depth, causing unnecessary reverts.
Setting slippage tolerance too high on a low-liquidity pair, which opens you to front-running and sandwich attacks.
Forgetting that the calculator models a single trade and does not account for pending transactions that may shift the pool before yours lands.
Edge cases and options
When your ending cash is higher than your starting cash, meaning you have negative burn, the runway display shows as infinite since you are not depleting reserves. This scenario occurs when revenue exceeds spending. The constant product formula assumes no trading fees, so the actual price impact on a real DEX will be slightly worse due to the protocol fee, typically 0.3 percent on Uniswap v2. For stablecoin pairs where the price should remain close to 1:1, even a small percentage of slippage represents a meaningful loss. In those cases, split large trades into smaller chunks over time to minimize cumulative impact.
Real-world use cases
Checking whether a $50,000 USDC-to-WETH swap on a moderate-liquidity pool will exceed 1 percent slippage before signing.
Comparing price impact across two different liquidity pools for the same token pair to choose the better route.
Determining the maximum trade size that stays within a 0.5 percent slippage tolerance for a specific pool.
Evaluating whether adding liquidity to a pool would reduce slippage enough to justify the capital allocation.
Frequently asked questions
Q: What is slippage?
A: Slippage is the difference between the expected price of a trade and the actual executed price. It occurs because large trades move the pool price ratio, creating price impact.
Q: What slippage should I set?
A: 0.5 to 1 percent is standard for most trades on major DEXes. For very large trades or low-liquidity pairs, you may need 2 to 5 percent. Higher slippage protects against front-running but risks worse execution.
Q: How is price impact calculated?
A: Using the constant product formula where x times y equals k. The more liquidity in the pool, the lower the price impact for a given trade size. This calculator uses the standard AMM model.
Q: Does this account for trading fees?
A: The calculator focuses on price impact from pool depth. Protocol fees like the 0.3 percent Uniswap v2 fee add a small additional cost on top of the displayed impact.
Start using it now
Try the Slippage Calculator tool. See also Token Swap Calculator and Impermanent Loss Calculator and Gas Fee Calculator.
