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Calcimator

MEV Calculator

Estimate Maximal Extractable Value (MEV) opportunity sizing for sandwich attacks, accounting for gas costs, builder tips, competition, and success rates.

Inputs

%
%
%

Results

Profit per success ($)

-$5.00

Extractable value ($)$250.00
Gas cost (2 txns) ($)$30.00
Builder tip ($)$225.00
Effective win rate (%)10%
Expected profit per opp ($)-$27.50
Daily expected profit ($)-$550.00
Monthly expected profit ($)-$16,500.00
Daily gas spend ($)$600.00
Break-even extractable ($)$300.00
How to Use This Calculator
  1. Enter the Target Transaction Value ($) — the USD size of the victim transaction you are analyzing.
  2. Set the Target Price Impact % — the price slippage that target transaction creates, which is your extractable value.
  3. Enter Gas Price (Gwei), ETH Price ($), and Gas per MEV Tx to calculate total gas cost for front-run + back-run.
  4. Set Success Rate % (competition for block inclusion) and Daily Opportunities to estimate daily profit.
  5. Review Net Profit per Execution, Daily/Monthly MEV Income, and Break-Even Extractable Value to evaluate the opportunity.

How the result changes with Builder tip (%)

Builder tip (%)Profit per success ($)
10$195.00
35$132.50
65$57.50
90-$5.00

What each input means

Target transaction value ($)
USD value of the target swap transaction to sandwich.
Target price impact (%)
Price impact the target transaction creates (extractable value).
Gas price (Gwei)
Current network gas price in Gwei.
ETH price ($)
Current ETH price for gas cost conversion.
Gas per MEV tx
Gas units consumed per MEV transaction (front-run or back-run).
Builder tip (%)
Percentage of MEV profit paid as tip to the block builder via Flashbots.
Base success rate (%)
Percentage of attempts that successfully land in the block.
Daily opportunities
Number of MEV-viable transactions spotted per day.
Competing searchers
Number of competing MEV searchers targeting similar opportunities.

What each result means

Profit per success ($)
Net profit when MEV extraction succeeds (after gas + builder tip).
Extractable value ($)
Total MEV value from the target transaction's price impact.
Gas cost (2 txns) ($)
Gas cost for front-run and back-run transactions.
Builder tip ($)
Amount paid to block builder for transaction inclusion priority.
Effective win rate (%)
Success rate adjusted for competition from other searchers.
Expected profit per opp ($)
Expected profit per opportunity after accounting for failed attempts.
Daily expected profit ($)
Projected daily profit across all opportunities.
Monthly expected profit ($)
Projected monthly profit (30 days).
Daily gas spend ($)
Total daily gas cost for all MEV attempts.
Break-even extractable ($)
Minimum extractable value needed to cover gas and builder tip.

How this is calculated

Worked example, using the default values

  1. Identify Input Parameters
    4 parameters
    Target transaction value ($) = 50000, Target price impact (%) = 0.5, Gas price (Gwei) = 30, ETH price ($) = 2000 = 9 input(s) provided
  2. Calculate Profit per success
    Profit per success = grossMevProfit - totalGasCost - builderTip
    -5 = $-5
  3. Calculate Extractable value
    Extractable value = targetTxValue * (priceImpactPct / 100)
    250 = $250
  4. Calculate Gas cost (2 txns)
    Gas cost (2 txns) = gasCostPerTx * 2
    30 = $30

Engine last updated . Checked against 2 independently-derived tests — how we verify calculators.

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