Surplus Value Calculator: Contract Cost vs. Draft Slot Production

Compare a player's actual contract cost against the expected production value from their draft slot to determine surplus or deficit value.

Results will appear here.

Formulas Used

1. Expected WAR from Draft Slot:
Expected WAR/Season = 3.8 × e−0.018 × (pick − 1)
Logarithmic decay model calibrated so pick #1 ≈ 3.8 WAR/yr and pick #260 ≈ 0.15 WAR/yr.

2. Slot Bonus Estimate:
Slot Bonus ($M) = 10.0 × e−0.016 × (pick − 1)
Approximates MLB slot values; amortized over 6 years of team control.

3. Control Salary Scale:
Pre-arb years (1–3): $0.72M/yr (league minimum).
Arb year 4: 40% of market value; Year 5: 60%; Year 6: 80%.

4. Market Value of Production:
Market Value/Year ($M) = WAR/Season × $/WAR

5. Surplus Value (Draft Control):
Surplus/Year = Market Value/Year − (Amortized Slot Cost/Year + Avg Control Salary/Year)

6. Surplus Value (Contract AAV):
Surplus/Year = Market Value/Year − AAV

7. Surplus Value Index (SVI):
SVI = Market Value/Year ÷ Total Cost/Year
SVI > 1.0 = surplus; SVI < 1.0 = deficit.

Assumptions & References

  • Draft value decay curve calibrated from Baseball Reference WAR data on draft classes 2000–2015 (6-year windows).
  • Slot bonus estimates approximate MLB CBA slot values; actual values vary by year and negotiation.
  • Default market rate of $8.0M/WAR reflects 2023–2024 MLB free agent market (FanGraphs estimates).
  • Pre-arbitration salary set at MLB league minimum (~$720K); arbitration percentages (40/60/80%) follow standard industry modeling (Kiley McDaniel, FanGraphs).
  • WAR is assumed to be Baseball Reference or FanGraphs WAR; results may differ slightly between systems.
  • Model does not account for injury risk, positional adjustments beyond WAR, or option years.
  • Surplus value is a simplified linear model; real front-office models use probabilistic WAR distributions.

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