How to Build Profitable Parlays: The +EV Strategy That Actually Works

Most people think you can't make money on parlays. The math disagrees.

If you've ever been told "parlays are sucker bets," you've been given incomplete information. While it's true that randomly throwing darts at a board won't make you money, there's a mathematically sound approach that can make parlays profitable over the long term.

Here's exactly how it works.

Understanding Positive Expected Value (+EV)

Before we dive into parlays, you need to understand the foundation: Positive Expected Value.

A +EV bet is a wager that is mathematically profitable over the long term because the probability of the outcome is higher than the odds offered by the sportsbook imply.

The Simple Math

Let's say a sportsbook offers you -110 odds on a coin flip. That implies a 52.4% probability. But a coin flip is actually 50/50. That's a -EV bet for you (and why the house always wins on coin flips).

Now flip it: if you could bet on a coin flip at +110 odds (implying 47.6% probability), but the real probability is 50%, you have a +EV bet. Over thousands of flips, you'd profit.

The key insight: When the true probability of an outcome exceeds the implied probability of the odds, you have an edge.

What Makes a Parlay Profitable?

Here's where it gets interesting for DFS and parlay platforms.

If every single leg in your slip is +EV, then your entire parlay is +EV.

This means you're expected to make money long-term. Will every parlay hit? Absolutely not. But over time, variance becomes your friend, not your enemy.

+EV Parlay vs -EV Parlay

The difference is stark. With a +EV parlay, short-term losses are just noise—the math is on your side. With a -EV parlay, you're fighting against mathematics itself.

How to Know if a Leg is +EV

This is where most bettors get lost. The answer varies by platform based on their payout structures.

Understanding Breakeven Odds

Every parlay type has a breakeven implied probability. If your leg's true probability exceeds this threshold, it's +EV.

Here are Betr's breakeven odds for different parlay types:

The Calculation

For a Betr 5 Man Insured slip, the breakeven is -116, which equals 53.70% implied probability.

If you find a leg where the true probability is higher than 53.70%, that leg is +EV for this parlay type.

How to Find +EV Bets Fast

Here's the hard truth: you aren't going to want to do this manually.

Finding accurate fair values requires:

• Pulling odds from multiple sportsbooks
• Removing the vig (devigging)
• Calculating true probabilities
• Comparing against breakeven thresholds

That's a lot of math for every single leg. This is why serious bettors use tools.

Real Example: Matthew Knies Over 1.5 Shots on Goal

Let's walk through an actual +EV identification:

The Setup:

• Platform: Betr 5 Man Flex
• Breakeven odds: -116 (53.70% implied probability)
• Player: Matthew Knies Over 1.5 Shots on Goal

The Analysis:

Other sportsbooks have this line at -130 to -143:

After devigging across books, the fair value comes out to 53.97%.

53.97% > 53.70% breakeven = This is a +EV leg!

The edge is small (0.27%), but that's how professional betting works. Small edges, repeated thousands of times, compound into significant profits.

Using a Fantasy Optimizer

Our Fantasy Optimizer at Monster.bet does this math automatically. Here's what it shows you:

For each player prop, you see:

• The line (e.g., Over 1.5 Shots on Goal)
• Platform odds (-116 for Betr)
• Fair value percentage (53.97%)
• Comparison across 15+ sportsbooks

When the fair value exceeds the breakeven threshold, the optimizer highlights it in green—that's your signal.

Building a Full +EV Slip

Using the optimizer, you can scan hundreds of props in seconds and build slips where every leg has positive expected value:

Example 5-Man Betr Flex Slip:

1. Jake Elliott Under 7.5 Kicking Pts - 54.25% fair value
2. Tetairoa McMillan Under 4.5 Receptions - 53.61% fair value
3. Andy Borregales Under 1.5 Field Goals - 53.59% fair value
4. Justin Herbert Under 1.5 Pass TDs - 53.43% fair value
5. Chris Boswell Over 6.5 Kicking Pts - 53.41% fair value

Every leg exceeds the 53.70% breakeven. The entire slip is +EV.

The Variance Reality

Let's be clear about expectations:

Short-term: You will lose slips. Sometimes many in a row. A 54% edge still loses 46% of the time on individual bets.

Long-term: The math works in your favor. Over hundreds of slips, your actual results will converge toward your expected value.

This is why bankroll management matters. You need enough volume for the math to play out. One +EV slip doesn't guarantee anything. Five hundred +EV slips? Now we're talking.

More Examples

Here's another example scanning NBA props:

The same principles apply across all sports. Find legs where the fair value exceeds the platform's breakeven threshold, and you're building +EV slips.

Key Takeaways

1. Parlays CAN be profitable if every leg is +EV
2. Fair value must exceed breakeven probability for the specific parlay type
3. Manual calculation is impractical—use optimizer tools
4. Small edges compound over high volume
5. Variance is temporary when the math is on your side
6. Different platforms have different breakevens—know your numbers

Start Finding +EV Parlays

Ready to build mathematically profitable parlays?

Our Fantasy Optimizer scans every major DFS platform and identifies +EV legs automatically. Combined with our Expected Value Calculator, you'll have everything you need to build slips that are designed to profit long-term.

Stop gambling. Start calculating.