Double yana ninka darajoji biyu cikin baji gida daya da ya buƙata aji biyu su zo. Shi ne ƙanƙantar jimlar gida kuma mafi bayani game da tattalin arziƙi na gida: yuwuwar tana ninka saurin sauki yayin da iko na bookmaker ya taru.
Double suna da ainihin lokacin amfani: zaɓa biyu da gaske aka yi maki kaɗan, inda ninka zaɓa biyu na kinaye ta hadiye kaɗai. Zaɓa mai kyau biyu a cikin double ba su fi yawa ba fiye da zaɓa guda-guda.
Aji biyu a 2.10, kowannemasu kai jiya: double ya biya 4.41 daya da yuwuwar gaske 25% (kyau 4.00) — jiya, wannan shine ƙima kawai idan aji biyu sun kasancewa SAMA da kyau. A aji kyau 2.00, aji double na 2.10 yana buƙata kinaye; biyu daga ciki sun hadiye zuwa 4.41 daya da kyau 4.00. Aji mai iko 1.90 ya hadiye ta hanya mara kyau: 3.61 an biya daya kyau 4.00.