Why is the payout so much bigger than the legs suggest?

Because prices multiply rather than add. Three legs at even money are 2 × 2 × 2 = 8, so 100 returns 800 — but the implied chance of all three landing is only 12.5%.

Is a parlay better value than separate bets?

No. The margin compounds with every leg. The page shows what the same stake split across singles would return so the two can be compared directly.

Parlay Calculator (Accumulator Payout)

Combined odds and payout across several legs.

Inputs

This converts odds formats and shows the payout arithmetic. It does not predict outcomes, and the implied probability includes the bookmaker's margin. No calculator gives you an edge. Betting is restricted by age and by state. If gambling is causing you harm, the National Problem Gambling Helpline is free, confidential and open 24/7: call or text 1-800-MY-RESET (1-800-697-3738), or chat at ncpgambling.org/chat.

Loading calculator…

Include CalculateEveryday mark

Calculating…

Use this calculator on your own site

Free embed

Two lines of HTML, unlimited views
Shows a small CalculateEveryday bar, with a credit link under the calculator

Formula

Combined decimal = leg₁ × leg₂ × … × legₙ. Return = stake × combined decimal

D_{\text{total}} = \prod_{i=1}^{n} D_i

A parlay is a single bet that needs every leg to win, and it pays as though each win were staked on the next. Multiplying the decimal prices gives the combined price. The advertised payout grows quickly, but so does the chance of losing everything on one leg.

Worked example

Two legs at −110 are 1.9091 each and a +150 leg is 2.50. Multiplied together that is 9.1116, so a 100 stake returns 911.16 — a combined price of +811. All three have to land, which the price puts at about an 11% chance.

Where this can give the wrong answer

One losing leg loses the whole bet. This shows the winning case only; the far likelier outcome is nothing back.
The bookmaker's margin is charged on each leg and then multiplied, so a parlay is worse value the more legs it has, even as the payout number grows.
Correlated legs — two outcomes in the same game — are not independent, and most books either refuse them or price them separately. Multiplying assumes independence.
Free-bet and bonus-bet stakes usually return profit only, not the stake, so the figure here will be higher than such a bet actually pays.

FAQ

: Because prices multiply rather than add. Three legs at even money are 2 × 2 × 2 = 8, so 100 returns 800 — but the implied chance of all three landing is only 12.5%.

Related calculators

Need this calculator, but different?

MakeACalc turns a plain-English description into an embeddable calculator — formula and worked example included. Launching soon.