Ma'anar ƙamus na kalmar "hanyar kalandar" tana nufin tsarin tsarin iyali na halitta wanda ya haɗa da bin diddigin al'adar mace don sanin lokutan da za ta iya samun haihuwa don haka mafi kusantar samun ciki. Wannan hanya kuma ana kiranta da hanyar rhythm kuma ta haɗa da kaurace wa jima'i ko yin amfani da maganin hana haihuwa a lokacin hailar mace. Hanyar kalandar ta dogara ne akan tunanin cewa ovulation yana faruwa kwanaki 14 kafin farkon al'ada na gaba, amma wannan yana iya bambanta daga mutum zuwa mutum kuma ba koyaushe daidai bane.