How We Calculate Rakeback
Rakeback calculations on this site use the following verified formula:
Rakeback = Wager Volume × Rakeback Rate
This is volume-based, not loss-based. The formula is applied consistently across all examples and calculators.
VIP tier rakeback rates are sourced from Duel's platform information. We note explicitly that these rates may change and should be verified in your account dashboard.
How We Calculate Expected Value
Expected value calculations use the standard mathematical formula:
EV per unit wagered = Game RTP − 1 + Rakeback Rate
For Duel Originals (RTP = 1.00): EV = 0 + Rakeback Rate = +Rakeback Rate
This is standard probability theory applied to casino games. We cite the mathematical foundations and present working calculations transparently.
How We Verify RTP and House Edge Claims
Claims about Duel Originals' 0% house edge (100% RTP) are based on:
- Duel's stated game mechanics and payout structures
- Mathematical derivation from stated odds and payouts
- Provably fair verification — the cryptographic system allows independent verification of game fairness
- Comparison with industry-standard RTP documentation practices
How We Handle Platform Rate Changes
Duel's VIP tier rates, thresholds, and features can change at any time. Our methodology:
- Rate tables are marked as indicative with clear disclaimers
- Pages include "Updated [date]" timestamps
- We include explicit recommendations to verify current rates in the Duel account dashboard
- Significant rate changes trigger content review and update
Calculator Methodology
All calculators on this site:
- Use the same formulas described in our guides
- Include disclaimers that results are estimates
- Account for variables including house edge (for non-Originals) and Enhanced Rakeback
- Present results clearly labeled as "estimates" not guarantees
Sources
- Duel.com platform — direct source for game mechanics, VIP program information
- Standard probability theory and casino mathematics literature
- Responsible gambling guidelines from BeGambleAware, GamCare, NCPG
- Cryptographic hash function documentation for provably fair explanations
Methodology last reviewed: June 2026