House Edge Guide — Casino Math Explained
Understanding house edge is fundamental to understanding gambling math. This guide explains exactly what it is, how it's calculated, and how rakeback modifies it.
Quick Answer
What is house edge in casino gambling?
House edge is the casino's mathematical advantage per bet, expressed as a percentage. A 4% house edge means the casino expects to retain $4 per $100 wagered over time. It's baked into game design through payout odds. Rakeback reduces effective house edge — DUEL5 cuts slot house edge from ~4% to ~2%.
Key Takeaways
- ✓House edge is the casino's expected profit as a percentage of every wager placed.
- ✓Duel Originals have ~1% house edge — among the lowest in crypto gaming.
- ✓Slots have ~3–5% house edge, but 50% DUEL5 rakeback cuts the effective edge in half.
- ✓Blackjack with basic strategy has 0.5% edge — the lowest single-game edge on Duel.
- ✓Effective Edge formula: Base Edge × (1 - Rakeback Rate).
- ✓House edge is a long-run average — short-term results are driven by variance.
House Edge vs RTP: Two Ways to Say the Same Thing
House edge and RTP are mathematically identical — just expressed differently. House edge is the casino's perspective; RTP is the player's perspective. Both describe the same mathematical reality.
House Edge Comparison: Duel vs Industry
| Game | Base Edge | DUEL5 Rakeback | Effective Edge | Industry Avg |
|---|---|---|---|---|
| Blackjack (Duel, basic strategy) | 0.5% | 5% of edge | 0.475% | 0.5% |
| Duel Dice / Crash | 1.0% | 5% of edge | 0.95% | 2–5% |
| Duel Roulette (single zero) | 1.0% | 5% of edge | 0.95% | 2.7% |
| Slots (Duel, high-RTP) | 3.0% | 50% of edge | 1.5% | 4–8% |
| Slots (Duel, average) | 4.0% | 50% of edge | 2.0% | 4–8% |
| American Roulette (other) | 5.26% | — | 5.26% | 5.26% |
Effective Edge = Base Edge × (1 − Rakeback Rate). Assumes DUEL5 tier.
How Rakeback Reduces Effective House Edge
Rakeback doesn't change the game's mathematical structure — the outcomes are the same. What it does is return a portion of the casino's expected profit to you as a rebate. This effectively reduces your expected loss rate per dollar wagered.
Base Edge
4% (slots)
Without any rakeback
DUEL5 Rakeback
50% of edge = 2%
Returned to player
Effective Edge
2% remaining
Your actual loss rate
Use the EV Calculator to model any house edge and rakeback combination.