Turn Sportsbook Promos Into
Guaranteed Cash

27 free calculators. Convert bonus bets, track every dollar, and learn the math behind every promo. A free PromoGrind account unlocks access and sync across Studio tools.

Open the App with Free PromoGrind Account → Start Free Trial
27Free Calculators
$0Cost to Start
8Major Sportsbooks
65–75%Avg Conversion Rate

Everything You Need to Grind Promos

From signup bonuses to daily recurring promos — every tool in one place, free forever.

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27 Free Calculators

Bonus bet converter, profit boost, arb, Kelly criterion, EV calculator, parlay builder, hedge validator, and 20 more. Free with a PromoGrind account.

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P/L Ledger & Cloud Sync

Track every promo conversion, hedge, and arb bet. See your running P/L, by-book breakdown, CLV tracking, and tax export. Syncs across all your devices.

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Live Arb + EV Scanner

Real-time arbitrage and +EV opportunities across 40+ sportsbooks. This surface is rolling out in beta as backend activation completes. VaultSparked Pro — try free for 7 days.

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Promo Calendar

Every recurring weekly promo across DraftKings, FanDuel, BetMGM, Caesars, and more. Graded A/B/C. Time estimates per promo so you can plan your sessions.

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Knowledge Base

Complete guides to matched betting, bonus conversion, arbitrage, EV betting, and account management. From beginner to advanced.

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Leaderboard & Community

See how your profit compares to other grinders. Share results anonymously. Refer friends to earn bonus Vault points.

27 Calculators

Everything you need across every promo type.

Bonus Bet ConverterProfit BoostFirst Bet HedgeDeposit MatchInsurance Promo2-Way Arbitrage3-Way ArbitrageParlay HedgeMiddle BetNo-Vig3-Way No-Vig+EV CalculatorKelly CriterionParlay BuilderSGP EstimatorHold CalculatorBet SizerLine ShopRollover CalculatorTeaser CalculatorRound RobinDeposit OptimizerHedge ValidatorPromo GuaranteeGut CheckPromo StackingIncome Estimator

What Grinders Say

Real results from real users.

Made back the subscription cost in 20 minutes with the first arb alert. The scanner is insane.
— Tyler M. $340 first week
I was using a spreadsheet before this. Never going back. The bonus bet converter alone saves me an hour per session.
— Jess R. $1,200/mo average
The free calculator suite is better than what OddsJam charges $150/mo for. The Pro upgrade is a no-brainer.
— Marcus D. 8 books completed

Simple, Honest Pricing

27 calculators are free with a PromoGrind account. Pro unlocks premium live features as they come online.

Free
$0/forever
  • All 27 calculators
  • P/L Ledger & cloud sync
  • Promo Calendar
  • Knowledge Base
  • Bet Tracker & Leaderboard
  • CSV export
Get Started Free
BEST VALUE
VaultSparked Pro
$24.99/mo
Or $199/yr — save $101 (2 months free)
  • Everything in Free
  • Live Arb Scanner (beta rollout)
  • Live +EV Scanner (beta rollout)
  • Real-time push alerts (beta rollout)
  • Scan history & analytics
  • Player props scanning
Start 7-Day Free Trial

Core calculators are available now with a free PromoGrind account. Live scanning, AI help, and other backend-dependent surfaces remain in beta until their services are activated.