Vig Calculator

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name: vig-calculator description: "Calculate vig (juice/overround/hold) for any sportsbook market. Convert odds to no-vig fair lines. Rank books by efficiency. Use when asked about vig, juice, hold percentage, overround, or sportsbook sharpness." metadata: openclaw: emoji: "🧮" requires: bins: ["python3"]

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Vig Calculator

Calculate the vig (juice/overround) for any sportsbook market and rank books by efficiency.

When to Use

Use this skill when the user asks about:

Vig, juice, or overround on a market

Hold percentage for a sportsbook

Removing vig to find fair/true odds

Ranking sportsbooks by efficiency or sharpness

Which book has the lowest juice

The AgentBets Vig Index

Operations

1. Calculate Vig for a Two-Way Market

Given American odds for both sides:

```python python3 -c " import sys odds = [int(x) for x in sys.argv[1:]] probs = [] for o in odds: if o < 0: probs.append(abs(o) / (abs(o) + 100)) else: probs.append(100 / (o + 100)) total = sum(probs) vig = (total - 1) * 100 hold = (1 - 1/total) * 100 print(f'Implied probs: {[round(p*100,2) for p in probs]}%') print(f'Sum: {round(total*100,2)}%') print(f'Vig (overround): {round(vig,2)}%') print(f'Hold: {round(hold,2)}%') fair = [round(p/total*100,2) for p in probs] print(f'No-vig fair probs: {fair}%') " ODDS_SIDE_A ODDS_SIDE_B

About

Built by AgentBets — full tutorial at agentbets.ai/guides/openclaw-vig-calculator-skill/.

Part of the OpenClaw Skills series for the Agent Betting Stack.