Polymarket Expected Value Calculator

Calculator

Private browser calculation — values are not sent to us.

Calculating with the shown values…

Prefill from a link

Use the labeled field names as query parameters, such as ?cents=63. Only one finite value within each field’s displayed range is accepted; unknown, duplicate, and invalid parameters are ignored.

On this page

Expected value is a mathematical estimate based on the probability you enter. It does not validate that estimate or guarantee a profit.

How it works

Before entered costs, expected value per Yes share is your probability estimate minus the entry price.

Related tools

Price and Probability Calculator · Position Size Calculator

Use the result in context

Read a market page before relying on a number

Check the exact question, resolution rules and available market activity before using a calculator result for a real-world decision.

Frequently Asked Questions

Does a positive expected value guarantee profit?

No. It is a mathematical estimate based on the probability you enter, not a result forecast.

Why compare my estimate with market price?

The comparison makes your assumption explicit, but it does not prove that your probability estimate is correct.