How Do Longshot Odds Work?

Longshot odds look like they're written in a code designed to confuse people. +1000. +5000. +10000. They're not. They're just a way of saying 'if you bet $1, here's what you get back if you're right.'

+100 odds means even money. You bet $1, you win $1. Simple. +200 odds means you bet $1, you win $2 (so you get back $3 total). +1000 odds means you bet $1, you win $10 (so you get back $11 total). The pattern: take the number, divide by 100, and that's your multiplier. +300 ÷ 100 = 3x your stake. +500 ÷ 100 = 5x your stake.

+100: $1 returns $2 (even money, 50% implied probability) +200: $1 returns $3 (2-to-1 odds, 33% implied probability) +500: $1 returns $6 (5-to-1 odds, 17% implied probability) +1000: $1 returns $11 (10-to-1 odds, 9% implied probability) +2000: $1 returns $21 (20-to-1 odds, 5% implied probability) +5000: $1 returns $51 (50-to-1 odds, 2% implied probability) +10000: $1 returns $101 (100-to-1 odds, 1% implied probability)

Notice: as the number gets bigger, the payout gets bigger and the probability gets smaller. That's the whole trade-off. The less likely something is, the more you win if you're right.

Traditional sportsbooks list American odds. Prediction markets like Kalshi work on a contract system instead. You don't bet at +1000. You buy a contract priced at a certain number of cents. A contract at 5 cents means the market estimates a 5% chance of that event. If it happens, the contract pays out $1.

Dollar Bets translates prediction market contract prices back into American-style odds so you can understand them quickly. A 5-cent contract is equivalent to +1900 odds (roughly, depending on fees). A 2-cent contract is equivalent to +4900 odds.

The odds also tell you what the market thinks the probability is. +100 odds (even money) implies a 50% chance. +200 odds implies a 33% chance. The math: divide 100 by (the number after the plus sign plus 100).

So +5000 odds: divide 100 by 5100 = roughly 1.96% implied probability. That doesn't mean there's exactly a 1.96% chance. It means that's what the market price implies. The actual probability could be higher or lower. Markets aren't fortune tellers. They're just prices where buyers and sellers agree.

Understanding the math doesn't ruin the fun — it adds to it. You see a +5000 payout and it feels insane. Now you know why: the market thinks there's roughly a 2% chance. You're buying a lottery ticket at transparent odds, not a blind hope. That clarity is the whole point.

The dollar is also part of the clarity. You're not thinking about whether to risk your rent. You're thinking about what story is worth a dollar. That's entertainment.