Convert, strip, price
The no vig calculator that shows the fair price behind two odds
Two prices on the same market almost never add up to 100%. The gap is the margin, and until you take it out you are not looking at a probability at all, you are looking at a probability plus a charge. The calculators here do that arithmetic and show every line of it: the vig out of a two-sided price and the fair odds underneath, the break-even probability a single price implies and what an edge in it is worth, and what two, three or four legs multiply out to. They run in your browser, they ask for nothing, and there is nothing on this site to buy.
- 3
- free calculators on this site
- Odds arithmetic, nothing else
- Calculators
Three calculators, one piece of arithmetic each
Free to use. No account, no card, nothing to buy.
| Calculators | figures they give back | Calculators, on the worked example |
|---|---|---|
| Expected Value Calculator | A price and your probability in, the break-even, the edge in points and the expected value out | $12.50 Expected value of the stake |
| No Vig Calculator and No Vig Odds Calculator | Both sides of a market in, the overround, the hold and the fair vig-free price out | 4.76 The vig, the amount over 100 (%) |
| Parlay Calculator Odds and Payout | Two to four legs in, one decimal and American price out, with the probability it implies | $701.82 Profit if every leg wins |
Convert, strip, price
A posted price is a probability with a charge on top of it
- The conversion
- Minus 110 is 52.38%, not 50 Every American price is a probability written in a different alphabet, and converting it is one line of arithmetic that almost nobody does in their head. Until that line is done, two prices cannot be compared with each other or with anything you believe.
- The margin
- Two sides that add to 104.76, not 100 The extra 4.76 points on a standard two-sided market is the charge. Splitting each side by the total takes it out and leaves a fair probability and a fair price, which is the number worth comparing against a model or against another market.
- The edge
- What a two-point difference is actually worth A price implies a break-even probability. Your own probability either clears it or it does not, and the gap in percentage points turns into an expected value per unit staked that is usually much smaller than it feels.
Why not just use the calculator on the site showing the price?
Because a calculator published by the party quoting the price answers a different question from the one you are asking. What is on this site is the arithmetic on its own, with every step written out, no price attached to it and nobody with an interest in which way you read the answer. It is also why there is nothing here to click through to.
- What the page wants from you
- Fair Odds Calculator Nothing. There is no account, no form and nothing to buy
- A calculator attached to a priceA deposit, eventually, which is what the page is for
- Whether the margin is shown
- Fair Odds Calculator The overround and the hold are outputs, printed beside the fair price
- A calculator attached to a priceUsually absent, because it is the charge being made
- Where the figures go
- Fair Odds Calculator Nowhere. The arithmetic runs in your browser and nothing is sent
- A calculator attached to a priceInto an account record, generally attached to your identity
- What the answer is for
- Fair Odds Calculator Reading a price. No selection, tip or forecast is offered
- A calculator attached to a pricePlacing one, which is a different question from what a price means
This is a comparison of what a page is FOR, not of firms. No sportsbook, exchange or prediction venue is named anywhere on this site and none is linked.