guide · September 19, 2026
Kelly Criterion Calculator for Sports Betting
Work out your Kelly stake in seconds, with full, half and quarter side by side. Then see why the fraction the formula hands you is rarely the one to bet.
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Martin Vale
Martin Vale is an editorial pseudonym used for SureBets research and editorial work across betting maths and staking, exchanges and commission models, arbitrage tools and calculator methodology, bookmaker mechanics and sourced athlete-earnings estimates. Pages under this name separate provider statements from checked facts, show calculation assumptions and record material corrections for future readers.
- Betting maths and staking
- Betting exchanges
- Exchange commission
- Arbitrage betting
- Betting calculators
- Sourced earnings estimates
Articles by Martin Vale (12)
article · July 28, 2026
Why Did Orbit Exchange Increase Commission to 5% in 2026?
Orbit Exchange increased commission from 2.5% to 5%. See the confirmed change, what remains unexplained and how the higher fee affects returns.
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article · July 28, 2026
Best Orbit Exchange Alternatives After the 5% Fee Increase
Compare Orbit Exchange alternatives after commission increased to 5%. See fees, liquidity, custody and why SharkBetX is our best option for lower fees.
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article · September 19, 2026
Stake Confirm Email to Withdraw: When It Never Arrives
Stake asks you to confirm withdrawals by email as a security gate. Fix a missing confirmation email step by step and get the withdrawal moving again.
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article · September 19, 2026
Stake Withdrawal Issues: What Each Status Really Means
Stake withdrawal stuck? Diagnose every status: pending, broadcast, confirmed, rejected and returned, with the exact check and fix for each stage.
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article · September 19, 2026
What Is a Surebet? How a Price Gap Pays Either Way
What a surebet is, how two bookmakers' prices leave a gap that pays whichever side wins, why the margin is small and what makes it vanish before it locks.
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article · August 21, 2026
Carlos Alcaraz Net Worth 2026: $55M-$100M
We estimate Carlos Alcaraz's net worth at $55M to $100M as of 21 August 2026. See the prize money, Forbes income data and retention model behind the range.
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article · September 23, 2026
Prop Betting Strategy: How to Beat the Posted Line
Build a prop betting strategy from your own projection, a fair price with the margin removed and the price on offer, then log the closing price to test it.
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article · September 19, 2026
NBA Point Spread Betting: Why Half a Point Decides It
Learn NBA point spread betting: how lines and American prices work, what pushes and hooks do to a ticket, and how to compare spreads without chasing wins.
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article · September 23, 2026
Which Football League Is Easiest to Predict?
The favourite wins 53% to 57% of matches across Europe. See which league is most predictable, which has the most draws, and why the gap barely matters.
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article · September 8, 2026
What Is Vig in Betting? The Margin Inside Every Price
Vig is the bookmaker's cut, built into the odds instead of charged as a fee. See where it hides, what it costs over a season and how to pay less of it.
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article · September 23, 2026
Free Arbitrage Betting Software: What the Free Tier Hides
Free arbitrage betting software is only worth using after a test. Here is the one to run on your own accounts: coverage, delay, price, stake and time.
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