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Expected value (EV)

What is expected value (EV)?

Expected value is the average result of a bet over many repeats: each outcome's payoff times its probability, summed. A positive EV trade makes money on average if your probability is right.

On Polymarket

The EV calculator turns your own probability and the Polymarket price into an expected profit per share.

👉 Expected value calculator

Kelly criterion · Implied probability · Brier score

Frequently asked questions

How does Expected value work on Polymarket?

The EV calculator turns your own probability and the Polymarket price into an expected profit per share.

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