MEV Calculator

A sandwich attack extracts value by placing one transaction before a target trade and another right after it, profiting from the price movement the target transaction itself causes -- this calculator estimates whether that strategy is profitable after real costs. Extractable value is Target transaction value multiplied by Target price impact, representing the total value created by the target's own slippage. Gas cost (2 txns) covers both the front-run and back-run transactions, calculated from Gas per MEV tx, Gas price (Gwei), and ETH price. Builder tip is the share of gross MEV profit paid to the block builder (via Flashbots or similar) to guarantee transaction ordering and inclusion -- without this payment, a competing searcher's bundle could be selected instead. Profit per success is what remains after subtracting both gas cost and builder tip from Extractable value -- the actual take-home when a sandwich attempt lands successfully.

Because MEV opportunities are contested, Effective win rate divides Base success rate by Competing searchers, modeling win probability as declining roughly proportionally with more competition for the same opportunity. Expected profit per opp multiplies Profit per success by that adjusted win rate, then subtracts Failed attempt cost -- the gas wasted on attempts that don't land -- to get a realistic per-opportunity expectation. Daily and Monthly expected profit scale that per-opportunity figure by Daily opportunities (and 30 days for the monthly figure), while Break-even extractable shows the minimum Extractable value needed just to cover gas and builder tip costs, useful as a quick filter for which target transactions are even worth attempting. Real MEV profitability depends heavily on network conditions, builder relationships, and strategy sophistication that this simplified model does not capture -- treat it as a directional estimate, not a guaranteed return.