NFL same game parlay house edge: what the books charge extra

A same game parlay is sold as a parlay with a twist: the legs come from one game, so the book prices them together instead of multiplying them. The question is what that costs. In October 2026 we recorded DraftKings’ and FanDuel’s prices on the main spread with the main total, every direction, for four NFL games, next to the same book’s straight prices in the same minute, and scored each quote against a normal parlay of the same legs. The short answer: FanDuel paid about 7% less than the two legs multiplied in every direction, and DraftKings anywhere from 1% to 11% less depending on the direction. As a normal parlay those two legs cost 8.8% of the stake; as a same game parlay they cost 10% to 18.5%, 15% on average. NFL results say a side and the total land together no more often than chance, so on these combos the extra is margin, not a price for correlation. Every slip we priced was a worse bet than the same two legs as a normal parlay at the same book, and nothing came back for the difference.

What a normal parlay costs

A parlay pays the product of its legs’ decimal prices, so each leg’s vig rides along and the vigs compound. A −110 price carries 4.5% of hold on its own (the bettor’s expected loss per dollar when the no-vig chance is 50%), and two of them multiplied carry 8.9%, not 9.1%, because the second leg’s vig is only charged on the stake that survives the first. The ladder below is arithmetic, with nothing to measure: at −110 a leg, it is what DraftKings, FanDuel and the other US apps charge on almost every NFL spread and total. The second column runs the same ladder on nflverse’s closing prices for 5,370 NFL games since 2006, which come from a reduced-juice source (−105 each way is as common as −110 there), and shows how much of a parlay’s cost is just the −110 compounding.

The regulators’ numbers sit on that ladder. Illinois publishes each licensee’s parlay handle and revenue: in January 2026 DraftKings held 19.5% of its parlay handle and FanDuel 20.7%, which is what four or five legs at −110 produce. New Jersey’s September 2022 report put parlays at 17.4% against 1.7% to 4.4% for straight bets. None of the reports separates same game parlays from the rest, and no public archive carries their prices, which is why the next section exists.

What the books quoted

On the evening of Monday 12 October 2026 we built the same four two-leg parlays in the DraftKings and FanDuel apps for four Week 6 games: the favorite’s spread with the over, the favorite with the under, the underdog with the over and the underdog with the under, each from the main line. Every slip was recorded next to the game page showing both prices on the spread, the total and the moneyline at that minute, so each quote is scored against its own book’s vig, not a generic −110. The score is simple. Each leg’s no-vig chance comes from both sides of its market (multiplicative method, the one vigged uses on US retail prices), the chance of both legs landing is the product, and the hold is one minus that chance times the decimal price, once for the two legs multiplied and once for the slip.

FanDuel is flat: between 5% and 8% under the multiplied price on all sixteen directions it was asked for, a hold of 13.7% to 16.4%, 15.0% on average. DraftKings prices by direction. On Jets at Patriots it paid almost the multiplied price for the Patriots with the under and the Jets with the over (1% to 1.4% under) and took 10% off the Patriots with the over and the Jets with the under. On Cowboys at Packers, a near pick’em, the pattern changed: the Cowboys with the under got the near-full price and the other three directions lost 5% to 8.5%. Averaged over its eight quotes DraftKings held 14.2%, a shade under FanDuel, but with a range from 9.7% to 18.5% where FanDuel’s was 13.7% to 16.4%. A DraftKings customer who happens to want the direction its model calls correlated pays nearly double the premium a FanDuel customer pays; one who wants the opposite direction pays almost nothing extra.

Sixteen quotes from one evening are a first measurement, not a season’s worth, and they cover the main spread with the main total only. Moneyline legs, player props and three-leg slips are where the books’ correlation models do the most work and are the next thing to record. The quotes and the scoring script are in the open, and this page will carry the new rows as they are recorded.

Are the legs correlated?

A same game parlay is justified when its legs help or hurt each other, because then the multiplied price is wrong and the book has something real to reprice. We checked the common NFL shapes against results in nflverse, 7,354 games with closing lines since 1999, whose terms allow a published aggregate. For each pair of legs the table gives how often both landed, divided by how often each landed alone multiplied together: 1.00 means independent, above it the legs help each other, below it they hurt each other. The ranges in brackets are 95% intervals from resampling the games.

A side and the total are independent: the favorite covered and the game went over in 24.2% of 7,019 games against a product of 24.1%, and the same holds for the other three directions, for a moneyline with the total, and for favorites of a touchdown or more. The idea that a big favorite covers by running up the score, so the over comes with it, does not show up in the results. Every side-and-total quote above was priced below the multiplied legs anyway, in both directions, at both books. One pair is left out of the table on purpose: a moneyline with the same side’s spread. A favorite that covers has already won and an underdog that wins has already covered, so one leg contains the other, the pair lands exactly as often as the containing leg alone, and the slip is a single bet sold at a parlay’s price. It is not a parlay and should never be built.

The bottom line

Every same game parlay of an NFL side with the total that we priced was a worse bet than the same two legs as a normal parlay at the same book, and nothing came back for the difference. The slip paid 1% to 11% less than the legs multiplied; the two legs land together exactly as often as chance over 7,019 games, so the book had nothing to reprice; and the premium went straight to its margin. On a winning $100 slip that is $4 to $39 of payout given up, over and above the $8.80 of hold the parlay already carries. One $50 side-and-total slip a week for an NFL season hands over about $50 of extra expected loss on top of the $80 the normal parlay costs, and a bettor who builds a few a week gives up a few hundred dollars a season for the convenience of one tap.

So do not build an NFL side with the total. Put the shape in a normal parlay across two games, or bet the legs straight, and run any slip through the parlay calculator before you accept it. Never pair a moneyline with the same side’s spread, because one leg contains the other and the slip is a single bet at a parlay’s price. If you want a slip anyway, shop the direction: DraftKings and FanDuel disagreed by up to 9 points of hold on the same two legs, and the directions DraftKings priced within 1% to 1.4% of the multiplied legs are the only slips in this sample that cost about what a normal parlay costs. Moneyline legs, props and three-leg slips, where the builders’ correlation pricing does the most work, are the next to be recorded here.

Method and sources

The parlay ladder uses hold = 1 − 1/S per market, where S is the sum of the two sides’ vig-included implied probabilities, compounded as 1 − Π(1 − h) across legs; the nflverse column samples parlays from real season-weeks at each game’s closing prices. The quotes were recorded by hand from the two apps on 12 October 2026 (vigged’s own feed carries no same game parlay prices, and the builders are not scraped), scored with the multiplicative no-vig of each leg’s own market at that book and minute, and are published with the scripts in the vigged repository (tools/sgp-study). The correlation table uses nflverse (CC BY 4.0) with 2,000 bootstrap resamples for the intervals; the same checks on college football, baseball and soccer are in the study notes in the repository and are not on this page. The Illinois figures come from the Illinois Gaming Board’s monthly licensee reports and the New Jersey figure from the Division of Gaming Enforcement’s September 2022 report. The de-vig method behind the no-vig chances is the one the de-vig study settled on for US retail prices.

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