One price, three displays
| Fractional | Decimal | American | Profit on 10 units | Gross return |
|---|---|---|---|---|
| 1/1 | 2.00 | +100 | 10 | 20 |
DraftKings' terminology guide provides one current operator reference for the formats.
The 50% calculation
At decimal 2.00, raw implied probability is 1 / 2.00 x 100 = 50%. At fractional 1/1, it is 1 / (1 + 1) x 100 = 50%.
This is the probability at which a zero-cost, two-outcome payoff would break even before fees. It does not establish the true probability. In a complete two-way market priced at 1.91 on both sides, each raw share is 52.36% and the total is 104.71%, showing why the whole market matters.
Shorter and longer than evens
- Decimal below 2.00 is shorter than evens: possible profit is smaller than stake.
- Decimal above 2.00 is longer than evens: possible profit is larger than stake.
Neither label says whether the price is good. Expected value depends on the accepted payoff and a defensible probability estimate; OpenStax gives the underlying expected-value definition.
Use evens as a calculation checkpoint
Evens is a useful boundary because three common displays meet at the same payoff: fractional 1/1, decimal 2.00 and American +100. A 35-unit winning stake produces 35 units profit and 70 units gross return in each format. The raw reciprocal is 1 / 2.00 x 100 = 50%.
That 50% is a break-even conversion before any costs. It does not say that the event is a coin flip, and it does not remove the need to identify the market. A team offered at evens to win in regulation and the same team offered at evens to qualify have equal printed payoffs but different settlement conditions.
Common phrase checks
| Phrase | Usual payoff meaning | What to verify |
|---|---|---|
| Evens | 1 unit profit per unit staked | Accepted price is 2.00 or 1/1 |
| Odds-on | Profit is smaller than stake | Exact fraction or decimal price |
| Odds-against | Profit is larger than stake | Exact price and market |
When an interface rounds a nearby price to descriptive text, calculate from the numeric receipt. Decimal 1.99 and 2.01 are close to evens but are not mathematically identical to 2.00.
Related resources
Continue with short odds versus long odds or the concise odds-on definition.
Continue learning
- Next guide: Football Odds Comparison
- Related guide: How to Calculate Betting Returns and Profit
Assumptions and limitations
Examples assume standard fixed odds and no commission, deduction or promotional condition. A 50% break-even conversion is not a calibrated forecast and does not make an even-money bet low risk.
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