# How to read prediction market prices as odds

> A prediction market price in cents is the market's implied probability: a contract at 40¢ means roughly a 40% chance. To get decimal odds, divide 1 by the price (1 ÷ 0.40 = 2.50); in American odds a 40¢ price is +150 and a 60¢ price is -150. Trading fees and the bid-ask spread make the odds you actually get slightly worse.

- URL: https://safebet.ai/us/prediction-markets/prediction-market-odds/
- Markdown version: https://safebet.ai/us/prediction-markets/prediction-market-odds/index.html.md
- Last updated: 2026-09-30 (re-checked when an operator changes its terms or a regulator or court acts)
- Author: SafeBet.ai Research Team (SafeBet.ai)
- Editorial policy and advertiser disclosure: https://safebet.ai/editorial-policy/

## Key takeaways

- A $1 binary contract's price in cents is its implied probability: 25¢ ≈ 25%.
- Decimal odds = 1 ÷ price. American odds = +(1 − price) ÷ price × 100 below 50¢, and −price ÷ (1 − price) × 100 above 50¢.
- Buying Yes at 40¢ is like betting at +150; buying No at 60¢ in the same market is like betting at -150.
- Add the fee to the price before converting: 40¢ plus Kalshi's 1.68¢ taker fee works out to about +140.
- To find value, compare the price with your own probability estimate — our EV calculator does the math.

## Price = probability

Most prediction market contracts are binary: they pay $1 if the event happens and $0 if it doesn't. That makes the price easy to read. If a contract trades at 62¢, traders are collectively willing to pay 62¢ for a chance at $1, which implies a probability of about **62%**.

That's also why prediction markets quote prices in cents rather than odds. But if you're used to sportsbooks, or you want to compare the two, it helps to translate. Our [ranking of the best prediction markets in the US](https://safebet.ai/us/prediction-markets/) covers where you can trade these contracts; this guide covers how to read them.

## The conversion formulas

For a contract priced at *p* (in dollars, so 40¢ = 0.40):

| Format | Formula | Example at 40¢ |
|---|---|---|
| Implied probability | p × 100% | 40% |
| Decimal odds | 1 ÷ p | 2.50 |
| American odds (p below 0.50) | +(1 − p) ÷ p × 100 | +150 |
| American odds (p above 0.50) | −p ÷ (1 − p) × 100 | (60¢ → -150) |
| Fractional odds | (1 − p) ÷ p | 3/2 |
| Profit per $1 contract | $1 − p | 60¢ |

You don't have to do this by hand: enter the probability in our free [odds calculator](https://safebet.ai/tools/odds-calculator/) and it shows the American, decimal and fractional equivalents.

## Conversion table

| Price | Implied probability | Decimal odds | American odds | Profit on $100 staked |
|---|---|---|---|---|
| 5¢ | 5% | 20.00 | +1900 | $1,900 |
| 10¢ | 10% | 10.00 | +900 | $900 |
| 20¢ | 20% | 5.00 | +400 | $400 |
| 25¢ | 25% | 4.00 | +300 | $300 |
| 30¢ | 30% | 3.33 | +233 | $233 |
| 40¢ | 40% | 2.50 | +150 | $150 |
| 50¢ | 50% | 2.00 | +100 | $100 |
| 60¢ | 60% | 1.67 | -150 | $67 |
| 70¢ | 70% | 1.43 | -233 | $43 |
| 75¢ | 75% | 1.33 | -300 | $33 |
| 80¢ | 80% | 1.25 | -400 | $25 |
| 90¢ | 90% | 1.11 | -900 | $11 |
| 95¢ | 95% | 1.05 | -1900 | $5 |

These are fee-free figures. "Profit on $100 staked" means spending $100 on contracts at that price — at 25¢ that's 400 contracts, which pay $400 if they win.

## Yes and No are two sides of the same bet

In a market such as "Will the Chiefs win?", buying **Yes at 40¢** is the same position as betting the Chiefs at +150. Buying **No at 60¢** is betting against them at -150. Because the two sides of a contract pay $1 between them, their prices add up to roughly $1 — in practice slightly more, because of the spread (see below).

That's also how you exit early. You can sell the contracts you hold, and on some platforms — Interactive Brokers' ForecastEx, for example — you close a position by buying the opposite side.

## Adding fees and the spread

The odds you actually get depend on what you pay, not just the quoted price:

1. **Start from the ask** — the price you can buy at right now — not the last traded price.
2. **Add the trading fee.** On Kalshi, the taker fee on a 40¢ contract is 0.07 × 0.40 × 0.60 = 1.68¢, so each contract really costs 41.68¢.
3. **Convert the total.** 1 ÷ 0.4168 = 2.40 in decimal odds, or about **+140** instead of +150.

The fee matters most near 50¢ and very little near 1¢ or 99¢. The spread matters most in thin markets: if Yes can be bought at 42¢ but only sold at 38¢, you give up 4¢ on a round trip before fees. Our [prediction market fees guide](https://safebet.ai/us/prediction-markets/prediction-market-fees/) compares every platform's fees.

## Going the other way: odds to prices

To compare a sportsbook line with a prediction market, turn the odds into a price:

- **-110** → 110 ÷ (110 + 100) = **52.4¢**
- **+150** → 100 ÷ (150 + 100) = **40¢**

If a sportsbook offers -110 on a team and a prediction market lets you buy the same outcome at 50¢ plus a small fee, the prediction market is the better price. Our comparison of [prediction markets vs sportsbooks](https://safebet.ai/us/prediction-markets/prediction-markets-vs-sportsbooks/) goes into when each makes sense.

## Finding value

A price is only a good buy if you think the true probability is higher. Suppose a contract costs 45¢ and you estimate the chance at 52%:

- Cost per contract with Kalshi's taker fee: 45¢ + 1.73¢ = 46.73¢
- Expected payout: 52% × $1 = 52¢
- Expected value: 52¢ − 46.73¢ = **+5.27¢ per contract**, or about $5.27 per 100 contracts

That's a positive expected value — but only if your 52% is right. Our [EV calculator](https://safebet.ai/tools/ev-calculator/) runs the same math for any price and probability.

## Why the CFTC warns about odds displays

In August 2026 the CFTC reminded exchanges to show clear pricing and warned that displaying event contracts in sportsbook-style American odds is likely to mislead users, because it can obscure fees and the fact that you're trading against other people rather than a bookmaker. Converting prices yourself is fine for comparison — just remember to include the fee and the spread.

## The bottom line

Read a prediction market price as a probability, convert it with 1 ÷ price when you want decimal odds, and always include fees before comparing it with a sportsbook. When you're ready to trade, compare the platforms in our [ranking of the best US prediction markets](https://safebet.ai/us/prediction-markets/).

## Frequently asked questions

### What does a price of 70¢ mean?

It means traders collectively put the chance of that outcome at about 70%. You'd pay 70¢ per contract to receive $1 if it happens — a 30¢ profit — which is equivalent to American odds of about -233.

### How do I convert a prediction market price to American odds?

Below 50¢: divide (1 − price) by the price and multiply by 100, then add a plus sign — 25¢ gives +300. Above 50¢: divide the price by (1 − price), multiply by 100 and add a minus sign — 75¢ gives -300. At exactly 50¢ it's even money (+100).

### Why don't Yes and No prices add up to exactly $1?

Because of the spread. The best price to buy Yes and the best price to buy No usually add up to slightly more than $1, which is how liquidity providers are paid. The closer the sum is to $1, the more liquid and cheaper the market.

### Are prediction market odds better than sportsbook odds?

Often, on popular markets. A fair 50/50 contract bought as a taker on Kalshi costs the equivalent of about -107, compared with -110 at a typical sportsbook. Thin markets with wide spreads can be worse, so always compare the actual price you'd pay.

### Why do some apps show prices in cents instead of odds?

Because a price is the probability. The CFTC warned platforms in August 2026 that presenting event contracts in sportsbook-style American odds is likely to mislead, since it hides fees and the fact that you're trading with other people.

## Sources

1. [CFTC Reminds Markets to Display Clear Pricing Information (Press Release 9278-26)](https://www.cftc.gov/PressRoom/PressReleases/9278-26) — Commodity Futures Trading Commission, 2026-08-07
2. [How Forecast Contracts Work](https://forecastex.com/about/how-forecast-contracts-work) — ForecastEx, accessed 2026-09-30
3. [Fees](https://help.kalshi.com/en/articles/13823805-fees) — Kalshi, accessed 2026-09-30
4. [Kalshi Fees Explained (quoting the fee schedule effective 2026-07-07)](https://polykal.net/kalshi-fees-explained/) — polykal.net, 2026-09-28
5. [Polymarket US fees](https://docs.polymarket.us/fees) — Polymarket US, accessed 2026-09-30