Union Jack Trebles Calculator

This calculator works out the outlay and return on a Union Jack Trebles bet: nine NFL, NBA, MLB or NHL moneyline picks arranged in a 3x3 grid and played as eight separate three-pick parlays, one for each row, column and diagonal.

What Is a Union Jack Trebles?

A Union Jack Trebles is a bet built from nine picks — moneyline selections on games from the NFL, NBA, MLB or NHL — arranged in a three-by-three grid. Instead of betting all nine together in one giant parlay, the bet breaks the grid into eight separate three-pick lines: the three rows, the three columns and the two diagonals that run corner to corner. Each line is played as its own treble, a three-selection parlay in which all three picks must win for that line to pay out.

The name comes from the pattern those eight lines trace across the grid — the same crossing shape as the flag. At eight total bets, the Union Jack Trebles is the smallest and cheapest member of the Union Jack family, which also includes the Trixie, Patent and Round Robin versions built on the same nine-pick grid but with more bet types per line.

Because every line is a treble and nothing smaller, a Union Jack Trebles only pays out on lines where all three picks land. A line with two winners and one loser returns nothing, no matter how short the odds on the two winners were. That makes the bet a pure test of hitting complete rows, columns and diagonals, and it is why where you place each pick in the grid matters as much as which nine picks you choose.

How Union Jack Trebles Is Calculated

A Union Jack Trebles always produces eight lines: three rows, three columns and two diagonals cut across the 3x3 grid, and each line is bet as a single treble — a three-pick parlay. Because every line carries exactly one bet, the total number of bets is fixed at eight, and the total outlay is always eight times whatever unit stake you enter. Put a $1.00 unit stake on the slip and the total outlay is $8.00, regardless of how the nine prices are arranged inside the grid.

Each treble’s return is found by multiplying together the decimal odds of its three selections, then multiplying that product by the unit stake. Take Row 1 from the worked example: Chiefs to win at 1.50, Bills to win at 1.80 and Eagles to win at 2.00. Multiply the three prices together and the combined odds for that line come out at 5.40, meaning a $1.00 stake on Row 1 returns $5.40 if Chiefs, Bills and Eagles all win.

The calculator repeats that same multiplication for each of the eight lines using whichever nine prices you enter into the grid, then adds the eight individual line returns together to give you a single total return and total profit for the whole Union Jack Trebles, without you having to work out any of the eight multiplications by hand.

What the Calculator Shows You

Once you enter your nine prices and unit stake, the calculator lays out all eight lines — Row 1 through Row 3, Column 1 through Column 3, and both diagonals — so you can see exactly which three picks make up each treble. Mark any pick as Win, Loss or Push and the calculator instantly shows you which of the eight lines are still alive, which have already failed, and which are guaranteed to have landed.

For each surviving line it shows the combined odds and the return that line alone would produce on your unit stake. Across the whole bet it totals every line’s return into a single return figure, and it also shows your total outlay — the unit stake multiplied by eight — so you can read your total profit at a glance rather than working it out by hand.

Worked Example

The worked example uses a Union Jack Trebles on nine NFL moneyline picks at a $1.00 unit stake, arranged in the following 3x3 grid:

Row 1: Chiefs to win (1.50), Bills to win (1.80), Eagles to win (2.00) Row 2: 49ers to win (1.60), Cowboys to win (2.20), Ravens to win (1.70) Row 3: Dolphins to win (2.50), Lions to win (1.40), Packers to win (1.90)

Those nine picks produce eight lines — three rows, three columns and two diagonals — and each line is played as a treble with a $1.00 stake, for a total outlay of $8.00 across the eight bets.

If all nine picks win, every one of the eight lines wins too, since every row, column and diagonal is made up entirely of winning selections. Row 1 (Chiefs, Bills, Eagles) returns $5.40, Row 2 (49ers, Cowboys, Ravens) returns $5.98, and Row 3 (Dolphins, Lions, Packers) returns $6.65. Column 1 (Chiefs, 49ers, Dolphins) returns $6.00, Column 2 (Bills, Cowboys, Lions) returns $5.54, and Column 3 (Eagles, Ravens, Packers) returns $6.46. Diagonal 1 (Chiefs, Cowboys, Packers) returns $6.27, and Diagonal 2 (Eagles, Cowboys, Dolphins) returns $11.00.

Add all eight line returns together and the total return on the $8.00 outlay comes to $53.31, for a profit of $45.31. That result depends on every pick winning; if even one selection loses, every line that includes it fails too, which is why a Union Jack Trebles can swing from a full $53.31 return down to a much smaller one depending on exactly which picks come in.

The Eight Union Jack Lines and Their Combined Treble Odds

Every Union Jack Trebles produces exactly eight lines, and the table below lists all of them for the nine-pick grid used in the worked example: three rows, three columns and two diagonals, each shown with the three selections that make it up and the combined treble odds for that line. These are the same combined odds used to calculate the worked example above, and the same eight lines the calculator lays out once you enter your own nine prices.

Where a Pick Sits Decides How Many Lines It Affects

Not every position in the grid carries the same weight, because each of the nine picks sits inside a different number of the eight lines. The table below shows how many lines run through the centre, through a corner and through an edge position, which is why the same nine prices can produce very different risk depending purely on where each pick is placed on the slip before you stake it.

Why the Centre Pick Carries More Weight Than Any Other

Position matters more than anything else in a Union Jack Trebles, and the numbers above show why. The centre pick sits in four of the eight lines — its row, its column and both diagonals — so if it loses, half of the entire bet is gone in a single stroke. A corner pick sits in three lines, so losing a corner takes out three of the eight lines at once. An edge pick sits in only its row and its column, two lines total, so losing an edge selection leaves six of the eight lines untouched.

That spread is why the strongest pick on your card belongs in the centre of the grid and the shakiest one belongs on an edge. Put your most confident selection in the middle and it works in your favor across four separate lines every time it wins. Put your least confident selection there instead, and one loss can wipe out four lines before you have even looked at the other five.

This is a choice the bet slip actually lets you make, since you decide which of your nine picks goes into which grid position, and it is one most bettors never think about. Filling in the grid in whatever order the picks come to mind, rather than by position, means leaving that advantage on the table.

When a Union Jack Trebles Makes Sense

A Union Jack Trebles suits a bettor who has genuine, differentiated confidence in nine separate moneyline picks and wants that confidence reflected in the grid itself rather than in one all-or-nothing parlay. Because the bet is built from eight overlapping trebles instead of a single nine-pick accumulator, it can still pay out something even when a handful of selections miss, provided enough complete rows, columns or diagonals survive intact. A single nine-leg parlay needs every pick to land, while a Union Jack Trebles only needs three picks to land together, in the right shape, for one of its eight lines to pay.

It makes the most sense when you can rank your nine picks by confidence and place the strongest in the centre of the grid, since that position alone decides four of the eight outcomes. It makes less sense if all nine picks are equally uncertain, since grid position can only protect you from picks already identified as weaker than the rest — it cannot turn a coin-flip selection into a safe one.

Because the total outlay is fixed at eight times the unit stake, bankroll management is straightforward: decide what you are willing to risk on the whole grid, divide by eight, and set the unit stake accordingly. Bettors who prefer a single bet with one outcome, or who do not want to think about grid position at all, are usually better served by a standard treble or a straight parlay instead.

Common Mistakes

Placing your least confident pick in the centre of the grid is a common error, since that position costs you four lines if it loses. Treating the grid order as purely cosmetic is another mistake, when it actually decides the whole shape of the bet and where the risk sits. Reading the unit stake as the total cost is a frequent misunderstanding — a Union Jack Trebles always costs eight times the unit stake. Finally, expecting a return from just one or two winning picks is a mistake, since every line is a treble, and every treble needs all three of its picks to win before it pays anything at all.

Union Jack Trebles vs the Other Union Jack Variants

The Union Jack Trebles is the entry point to the Union Jack family: eight bets total, one treble per line, and nothing more complex. The other three variants below use the same nine-pick grid but add more bet types to every line, which raises both the number of bets and the total outlay for the same nine selections.