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Middle Calculator

Stake both sides of a spread/total gap. Win small on either side, win big if the score lands in the middle.

New to this? Start with:Arbitrage Calculator

Quick start

  1. Enter the odds for Side A and Side B (different sportsbooks)
  2. Set your Side A stake — Side B sizes automatically to balance miss-cost
  3. See total risk, miss-cost, and middle-hit profit

Try a quick middle example

Standard -110 / -110 middle. Balanced stakes show miss-cost vs. middle-hit profit.

odds format selector

Need help with odds formats? Learn this step

Side A Odds

Converted

Decimal
Fractional
Probability
$
Range$0 – $1,000

Side B Odds

Converted

Decimal
Fractional
Probability

Side B stake auto-sizes to equalize the cost of missing the middle on either side.

Enter both odds and a Side A stake to see the middle breakdown.

Copy a link that opens this calculator with your current values.

How to Use the Middle Calculator

Enter the Side A Odds and Side B Odds — the opposite-side prices from two sportsbooks where the lines don't fully overlap. Enter your Side A Stake — the calculator auto-sizes Side B so the cost of missing the middle is identical on either side.

Worked example: standard -110 / -110 middle with $100 on side A. Side B auto-sizes to $100. Total risk: $200. Miss-cost (if only one side wins) is about $9.10 either way. Middle-hit profit (if the score lands in the gap) is about $181.80. Break-even hit rate ≈ 4.77%.

Use this calculator to confirm a middle opportunity is properly sized before placing both bets across two sportsbooks.

How it works

A middle exists when two sportsbooks price the same market with a gap — for example FanDuel lists a favorite at -2.5 while DraftKings lists the underdog at +3.5. Bet both sides, and if the final margin lands inside the gap (a 3-point favorite cover), both bets cash.

  1. Find the gap — Two sportsbooks list opposite-side lines that don't fully overlap. Most common on spreads (NFL especially) and totals.
  2. Size both stakes — Enter your Side A stake. The calculator sizes Side B to balance miss-cost — the loss when only one side wins is the same either way.
  3. Wait for the score — You lose the juice if either side wins exclusively. If the score lands in the gap, both sides cash.

Related tools and guides

Use the arbitrage calculator for pre-bet sure-things (no gap, both sides cash), the hedge calculator for follow-on hedging math, and the arbitrage guide for the underlying betting math.

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Arbitrage Calculator

Find guaranteed profit by betting both sides of a market

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Hedge Calculator

Lock in guaranteed profit on a live or futures bet

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Arbitrage Betting Guide

Learn how to find and exploit arbitrage opportunities

Middle Betting FAQs

A middle is when two sportsbooks price the same market with a numerical gap. Betting both sides locks a small loss if either side wins exclusively, and a large profit if the score lands inside the gap. Most common on NFL spreads and totals.

Arbitrage guarantees profit regardless of which side wins. Middle accepts a small guaranteed loss for a chance at much larger combined payout if the score lands in the gap.

Miss-cost divided by (miss-cost + middle profit). Standard -110 / -110 middle with $100 stakes: miss-cost ≈ $9.10, middle profit ≈ $181.80, break-even hit rate ≈ 4.77%.

Yes, in all US sports-betting jurisdictions. Sportsbooks may limit accounts that consistently target middles and arbitrage, so spread action across multiple books.