Roulette House Edge Calculator

Work out roulette house edge instantly with clear inputs, formula shown and shareable results.

About Roulette House Edge Calculator

Expected value per unit staked is the win probability times the payout minus the loss probability, and the house edge is the negative of that value. Every bet on a given wheel carries the same edge, 2.70% on single zero and 5.26% on double zero, so bet selection changes volatility but never the long-run cost.

Formulas

Expected value

EV = P(win) x payout - P(lose), with P(win) = winning pockets / total pockets

House edge

edge = -EV x 100

Worked example

With the default values below, Roulette House Edge Calculator returns House edge of 2.7027%. Change any input above and every figure here is recalculated in your browser.

Inputs used

Wheel typeone of European, single zero (37 pockets), American, double zero (38 pockets), Triple zero (39 pockets): European, single zero (37 pockets)
Bet typeone of Even money (red, black, odd, even), Dozen or column (pays 2 to 1), Straight up single number (pays 35 to 1): Even money (red, black, odd, even)
Stake per spinminimum 0.01: 10
Number of spinsminimum 1: 100

Results

House edge: 2.7027%
Chance of winning a spin: 48.649%
Expected loss over the session: $27.03
Total wagered: $1,000.00

Step by step

1Values used
2Expected value
3House edge
4House edge= 2.7027
5Chance of winning a spin= 48.649
6Expected loss over the session= 27.03
7Total wagered= 1,000.00

Assumptions and limits

The result is derived only from the 4 inputs listed above. Anything not among them is not part of the calculation.
In particular, this calculator does not take inflation, tax, fees or charges or compounding frequency into account.
Figures are rounded for display to 4 decimal places, so totals built from several rounded parts can differ slightly from the unrounded arithmetic.

How these calculators are built and tested is described on the Methodology page. If a figure looks wrong, please report it.

Frequently Asked Questions

How is the Roulette House Edge figure worked out?

EV = P(win) x payout - P(lose), with P(win) = winning pockets / total pockets. Expected value per unit staked is the win probability times the payout minus the loss probability, and the house edge is the negative of that value.

Why does this matter?

Every bet on a given wheel carries the same edge, 2.70% on single zero and 5.26% on double zero, so bet selection changes volatility but never the long-run cost.

What do I need to enter?

Enter wheel type, bet type, stake per spin, number of spins. The defaults shown are a realistic worked example — swap in your own figures to get a result you can use.