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Roulette Expected Value (EV) Calculator

See what your bet “really” does over 1, 50 or 1,000 spins.

This calculator shows the expected value (EV) of a roulette bet – both per spin and over a full session. You choose the wheel, bet type, stake size and number of spins, and it reveals how much you’d expect to be up or down on average if you could repeat that session thousands of times.

It uses the same math that underpins the Roulette Probability Calculator, but focuses specifically on long-term expectation and house edge, which are crucial when judging any roulette system.

📊 EV per spin & per session 🎡 European & American wheels 🎯 All core bet types

Calculate EV for your roulette bet

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Think of this as one full session or a block of play.

How the EV calculator works

The calculator uses standard European (37-pocket) and American (38-pocket) wheel layouts and typical casino payouts. It combines win probability, loss probability and payout to compute expected value and house edge.

Key formulas (in plain language)

  • Win probability
    Numbers covered ÷ total pockets.
  • Fair payout
    If there were no house edge, a truly fair payout would be (1 / win_prob) − 1 to 1.
  • EV per $1
    EV = (win_prob × payout) − (lose_prob × 1), where “payout” is the net win (35 for a 35:1 straight-up, 1 for an even-money bet, etc.).
  • House edge
    The house edge is simply −EV expressed as a percentage of the stake.
  • Session EV
    Multiply EV per $1 by your stake and number of spins: EV_session = EV_per_$1 × stake × spins.

Using EV with roulette systems

EV doesn’t care whether you flat bet, use Martingale, follow Fibonacci, or invent your own pattern. As long as the underlying bets and wheel don’t change, the expected value per dollar staked stays the same.

What systems do change is volatility: how quickly stakes grow, how deep streaks feel and how “swingy” your results are. For a deeper dive on that, read the relevant guides in the systems library and use this tool as a grounding reality check.