Event contract tool

YES/NO Contract Calculator

Estimate contract cost, implied probability, payout, and break-even price for a simple $1 YES/NO event contract.

  • No external APIs
  • Educational math only
  • No platform-specific fee claims

Inputs

Live calculator
Contract side
$0.54

Manual account-size reference. It does not change by itself.

Results

YES side
Implied probability 54.0% For the selected side at the entered price.
Profit if correct $4.60 After optional fees.
Cost to enter$5.40
Payout if correct$10.00
Loss if incorrect$5.40
Fees included$0.00
Break-even price$0.54
Position size (% of bankroll)2.2%
This calculator assumes a simple event contract that costs the entered price and pays $1.00 if the selected side is correct. It is not financial advice and does not model every exchange fee, spread, tax, or liquidity condition.
  • cost = price * contracts
  • payout = $1.00 * contracts
  • profit = payout - cost - fees
  • loss = cost + fees
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