How should I use this result?

Treat it as a fast decision aid. For execution-sensitive trades, check live bid, ask, fees, and slippage before acting.

Does this assume Polymarket-style binary settlement?

Unless a tool says otherwise, outputs assume binary shares settle to either $1 or $0 at resolution.

ExecutionFree utility

Quantify what you pay by crossing the bid-ask spread instead of trading at mid.

spread costbid askexecution cost

Adjust live

Calculator setup

Enter your assumptions and this tool will update immediately.

Best bid

Best ask

Trade side

Instant

Primary output

0.0200

Spread cost per share

Live resultReady to copy

Midpoint

0.5000

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