+420 Odds Explained
- Decimal
- 5.20
- American
- +420
- Fractional
- 21/5
- Implied probability
- 19.23%
- Polymarket
- 19¢
- $100 wins
- 420.00
- American
- +420
- Fractional
- 21/5
- Implied probability
- 19.23%
- Polymarket
- 19¢
- Profit
- 420.00
- Total return
- 520.00
5.200 decimal, +420 American, 19.23% implied probability
+420 is an American price:
the plus sign marks an underdog, and the number is the profit on a 100 stake
. Every other format describes the same chance: 5.20 decimal, 21/5 fractional, 19.23% implied probability, 19¢ on Polymarket.
What +420 pays
A 100 stake at +420 returns 520.00 in total: your 100 back plus 420.00 profit. To win exactly 100 you would stake 23.81. The table covers the stakes people actually use.
| Stake | Profit | Total return |
|---|---|---|
| 10 | 42.00 | 52.00 |
| 25 | 105.00 | 130.00 |
| 50 | 210.00 | 260.00 |
| 100 | 420.00 | 520.00 |
| 500 | 2,100.00 | 2,600.00 |
| 1,000 | 4,200.00 | 5,200.00 |
Break-even and long-run results
The implied probability of +420 is 19.23%, and that number is also the break-even win rate: win more often than 19.23% of the time at this price and you profit in the long run, win less often and you lose. The table shows the return on stake at a few win rates, including the break-even rate itself.
| Win rate | Return on stake |
|---|---|
| 19% | -1.2% |
| 50% | 160.0% |
| 55% | 186.0% |
| 60% | 212.0% |
| 65% | 238.0% |
With an implied chance of 19.23%, a bet at +420 is expected to lose most of the time and to pay 420.00 on 100 when it does not. Outright markets, correct scores and big upsets are where these prices appear, and they are the prices bookmakers shade the hardest.
The vig at +420
If both sides of a two-way market were priced at +420, the implied probabilities would add up to -61.54% above 100%. That excess is the overround, or vig; as a share of stakes it is a -160.00% margin for the bookmaker. Removing it leaves fair odds of 2.00 decimal ( +100) on each side. Use the devig calculator to do the same for any market.
+420 on a betting exchange
Exchanges charge commission on net winnings, so the price you see is not the price you get. At 2% commission +420 is worth 5.116 decimal (+412 American); at 5% it drops to 4.990 (+399). Those are the bookmaker prices you would need to beat.
| Commission | Effective decimal | Effective American | Break-even |
|---|---|---|---|
| 2% | 5.116 | +412 | 19.55% |
| 5% | 4.990 | +399 | 20.04% |
Same price in other formats
Nearby prices
Nearby prices
Frequently asked questions
What does +420 mean in betting?
+420 is an American price. Positive numbers show the profit on a 100 stake; negative numbers show the stake needed to win 100. At +420 the implied probability is 19.23% and a 100 stake returns 520.00.
What is +420 in decimal odds?
+420 converts to 5.200 in decimal odds (usually shown as 5.20). Decimal odds are the total return per unit staked, so multiply your stake by 5.200 to get the return.
What is +420 as a fraction?
+420 is 21/5 in fractional odds, the traditional bookmaker notation where the top number is profit and the bottom number is stake.
How much do I win on a 100 bet at +420?
A 100 stake at +420 wins 420.00 in profit and returns 520.00 including the stake. To win exactly 100 you would stake 23.81.
What win rate do I need at +420?
The break-even win rate equals the implied probability, 19.23%. Winning more often than that at this price is profitable over the long run; winning less often loses money.