Enter the odds for each leg and your stake. See the parlay's combined odds, what it pays, and the chance it hits.
Odds can be American (+150, -110), decimal (2.50) or fractional (3/2). A parlay pays the legs' decimal odds multiplied together, so every leg has to win.
Turn each leg into decimal odds and multiply them. -110 is 1.909, +150 is 2.50 and -200 is 1.50, so the parlay is 1.909 × 2.50 × 1.50 = 7.16, or +616. A $10 bet pays back $71.59.
The chance it hits is the legs' chances multiplied too. Using the books' own prices, that chance includes their cut on every leg, which is why long parlays are usually a worse bet than they look.
Same-game parlays are priced differently: the sportsbook adjusts for legs that tend to hit together, so the real price can be shorter or longer than this math. Build one from tonight's props with the bet slip.
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Convert every leg to decimal odds and multiply them. The result is the parlay's decimal odds; subtract 1 and multiply by your stake for the profit.
It depends on the legs. Three -110 legs pay about +596, so a $10 bet returns about $69.58.
Most sportsbooks drop that leg and pay the parlay at the remaining legs' odds. Check your book's rules, since some treat it differently.
Books price same-game parlays with correlation in mind, so legs that tend to hit together pay less than the straight math, and some combinations pay more.