| İzotop | Kütlesi | Yarı ömrü | Bozunma Şekli | Dönüştüğü İzotop | Nükleer
Spin |
| 35Ca | 35,0048 | 0,050 sn. | e- yakalama | 35K | |
| e- ykl. + p+ | 33Cl | ||||
| 36Ca | 35,9931 | 0,102 sn. | e- ykl. + p+ | 35Ar | 0+ |
| e- yakalama | 36K | ||||
| 37Ca | 36,9859 | 0,1811 sn. | e- yakalama | 36Ar | 3/2+ |
| e- yakalama | 37K | ||||
| 38Ca | 37,9763 | 0,440 sn. | e- yakalama | 38K | 0+ |
| 39Ca | 38,9707 | 0,859 sn. | e- yakalama | 39K | 3/2+ |
| 41Ca | 40,9623 | 103.000 yıl | e- yakalama | 41K | 7/2- |
| 45Ca | 44,9562 | 162,61 gün | 45Sc | 7/2- | |
| 47Ca | 46,9546 | 4,536 gün | 47Sc | 7/2- | |
| 48Ca | 47,9525 | >6E 18yıl | 48Ti | 0+ | |
| 49Ca | 48,9557 | 8,718 dk. | 49Sc | 3/2+ | |
| 50Ca | 49,9575 | 13,9 sn. | 50Sc | 0+ | |
| 51Ca | 50,9615 | 10 sn. | 51Sc | 3/2- | |
| 50Sc | |||||
| 52Ca | 51,965 | 4,6 sn. | 52Sc | 0+ | |
| 53Ca | 52,97 | 0,090 sn. | 52Sc | 2-, 5/2- | |
| 53Sc | |||||
| 54Ca | 53,975 | 54Sc | 0+ |