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Calcimator

Flash Loan Calculator

Size a flash loan arbitrage opportunity by calculating net profit after protocol fees, DEX fees, gas costs, and slippage. Determine break-even spreads and daily/monthly profit projections.

Inputs

%
%
%

Results

Net profit per execution ($)

$352.5

Profitable?Yes
Gross profit ($)$1,500
Total costs ($)$1,147.5
Flash loan fee ($)$90
DEX fees ($)$604.5
Slippage cost ($)$403
Break-even spread (%)1.15%
Daily profit ($)$1,762.5
Monthly profit ($)$52,875
ROI on gas capital (%)705%
How to Use This Calculator
  1. Enter the Flash Loan Amount ($) — the size of the uncollateralized loan from a protocol like Aave.
  2. Set the Flash Loan Fee % (Aave = 0.09%) and the Buy Price and Sell Price on the two venues you are arbitraging.
  3. Enter DEX Swap Fee % (Uniswap V3 pools are 0.05%, 0.3%, or 1%) and expected Slippage %.
  4. Set Gas Cost ($) for the entire flash loan transaction and Executions per Day to project daily income.
  5. Review Net Profit per Execution, Break-Even Spread %, and Daily/Monthly Profit — a negative net profit means the trade is not viable at current prices.
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