Slots Game EV Calculator – How Does It Work?

Oddsmart’s Slots Game Expected Value (EV) Calculator is a lightweight online tool that translates any free-spin or bonus-credit promotion into a clear profit forecast.

By entering just four inputs—bonus-credit value, number of free spins, spin value, and the game’s RTP—you instantly get three outputs: EV from bonus credits, EV from free spins, and total EV in pounds.

Expected Value (EV) measures your average long-run return by weighting each possible outcome by its probability.

For bonus credits, EV is simply bonus × (RTP ÷ 100).

Free-spin EV subtracts the total stake (spins × spin value) from the theoretical return (stake × RTP ÷ 100).

Summing these gives your overall expected gain or loss.

With this calculator you can rapidly compare bookmakers’ offers, prioritise the highest-EV promotions, and allocate your bankroll where it earns the most.

A positive total EV signals a profitable opportunity; a negative one warns you to skip or renegotiate terms.

An example with £10 credits and 10 spins at 10 pence each on a 10% RTP shows a net EV of –£89, demonstrating how seemingly generous freebies can be money pits once the maths is laid bare.

Beyond raw numbers, Oddsmart’s guide explains the underlying formulas, offers practical examples, and suggests advanced tips—like logging cumulative EV and balancing time-vs-value—to help matched bettors turn promotional complexity into disciplined, data-driven profits.