| Proton | Neutron | Nuclear Spin | Energy State | |
|---|---|---|---|---|
| 34Ca | 20 | 14 | 0 | |
| 35Ca | 20 | 15 | 1/2 | |
| 36Ca | 20 | 16 | 0 | |
| 37Ca | 20 | 17 | 3/2 | |
| 38Ca | 20 | 18 | 0 | |
| 39Ca | 20 | 19 | 3/2 | |
| 40Ca | 20 | 20 | 0 | Stable |
| 41Ca | 20 | 21 | -7/2 | |
| 42Ca | 20 | 22 | 0 | Stable |
| 43Ca | 20 | 23 | -7/2 | Stable |
| 44Ca | 20 | 24 | 0 | Stable |
| 45Ca | 20 | 25 | -7/2 | |
| 46Ca | 20 | 26 | 0 | Stable |
| 47Ca | 20 | 27 | -7/2 | |
| 48Ca | 20 | 28 | 0 | |
| 49Ca | 20 | 29 | -3/2 | |
| 50Ca | 20 | 30 | 0 | |
| 51Ca | 20 | 31 | -3/2 | |
| 52Ca | 20 | 32 | 0 | |
| 53Ca | 20 | 33 | -3/2 | |
| 54Ca | 20 | 34 | 0 | |
| 55Ca | 20 | 35 | -5/2 | |
| 56Ca | 20 | 36 | 0 | |
| 57Ca | 20 | 37 | -5/2 |