How the odds work
Every number on the tote board is a price. Once you can read the price, you can see what the game is really offering you, at Crab Derby and anywhere else that posts odds.
The American line
A plus number tells you what a $100 stake wins. Rehoboth Rocket at +250 pays $250 on $100, so you get $350 back. A minus number tells you what you must stake to win $100. Old Bay Betty at -150 needs $150 down to win $100, so $250 back.
The board also shows the same price two other ways: the decimal multiplier (3.50x means every dollar comes back as $3.50 if the crab wins) and the implied chance, which is what the price says about how often that crab should win.
Turning a price into a chance
Decimal odds are the easiest to flip. Divide one by the multiplier. 3.50x becomes 1 divided by 3.5, about 29 percent. 1.60x becomes about 63 percent. That is the share of races the crab would need to win for the bet to break even over time.
| Line | Multiplier | Implied chance |
|---|---|---|
| -200 | 1.50x | 67% |
| -110 | 1.91x | 52% |
| +100 | 2.00x | 50% |
| +250 | 3.50x | 29% |
| +600 | 7.00x | 14% |
Why the chances add up to more than 100
Add the implied chances of all six crabs on the board and you get about 108 percent. Six crabs cannot win 108 percent of the time. The extra 8 points are the take, the tote's cut. Every price on the board is shaved by that much, so the payout on a winner is always a little less than the true chance would pay.
At Crab Derby the take is a flat 8 percent on both tracks and we print it as it adds up. Real tracks run between about 15 and 25 percent on exotic bets. Sportsbooks hide theirs inside the -110 on both sides of a coin flip, which works out to about 4.5 percent per bet. Prediction markets charge a fee on winnings instead, which lands in the same place.
Why the take beats your picks
Picking winners feels like the whole game. It is not. Suppose you are genuinely good and your crab wins exactly as often as the true odds say. You still lose the take on every dollar, race after race, because the price you were paid was shaved before you ever chose. Over a hundred races at $10 a race that is $80 gone to the board whether you picked well or badly.
The only way to come out ahead over time is to find prices that are wrong by more than the take, and the board sets the prices. That is the entire business model of every book, track and casino, and it is why the meter on the home page shows the take and not your win rate.
The two tracks here
Crab Derby runs two ways, and the prices work differently on each.
The public race is a real tote. One race goes to post every fifteen minutes, on the clock, for everyone on the site at once. Every ticket goes into one pool, and the board is not a fixed price: it is the pool divided by the money on each crab, less the 8 percent take, recalculated as tickets come in. Back a crab nobody else likes and your price climbs; pile onto the favorite and it shrinks. The stand puts $120 of its own money into every pool, spread by form, so the board shows a price before the first ticket and a lone bettor is never paid out of an empty pool. The window closes two minutes before post, the race runs the same on every screen, and winning tickets split what is left. The only price that counts is the one on the board at post time.
Exactas and trifectas are the public race's long shots. An exacta names the first two home in order; a trifecta names the first three. Each has its own pool with the same 8 percent take, and the stand seeds every possible order by form, $120 across the 30 exactas and $120 across the 120 trifectas, so even an order nobody has touched has a price. Hitting one is much harder than picking a winner, which is why they pay so much more: a trifecta on three crabs the crowd ignored can pay a hundred times the stake. Pick Exacta or Trifecta above the field, press the crabs in the order you think they finish, and the slip shows what the order pays right now.
The tide is real. At post time the public race reads the actual tide at Indian River Inlet from NOAA's predictions. Swimmers go up to 7 percent better on full high water and as much worse on dead low; mudflat walkers the other way round; the rest do not care. The stand's opening stake follows the water, so the board moves with the tide before the crowd moves it again. The stable cards show which crab is which and how each has done on high and low water.
Grudges come from the record. Two crabs that have run one-two three times or more have a rivalry: the public race names the grudge match when both are in the field, the caller notices when they come down the stretch together, and the stable cards show each crab's chief rival and the head to head, counted over every race where both made the first three.
Track bucks are the public race's money. Sign in with a name and the stand opens you $100. Lose it and you are done for the day; the stand tops you back up to $100 when the day turns over at midnight Eastern. If you are down under $20 and the next race is calling, you can borrow $20 from the stand once a day, and it comes out of your next top-up unless you pay it back first: win with it and the Pay back button squares the stand the same day. The leaderboard and the results pages only know the public race.
Practice is a fixed-odds board against the house, on your own time. Press the button and the race runs now. The prices come from each crab's form plus the day's tide, with the same 8 percent take applied the way a tote applies it, but nothing you do moves them and nobody else is in the pool. The practice bank is yours alone, resets whenever you like, and never touches the leaderboard. Its ledger and its board live on the practice page and stay there. Use it to learn the board, then take what you learned to the public race.
On both tracks the take meter keeps the honest score. Race as much as you like. It costs nothing, which is the point.