| Part A - Should New Zealand keep the Mixed Member Proportional (MMP) voting system? |
| | Number of Votes | Percentage of Valid Votes | Percentage of Total Votes |
| KEEP | 1,267,955 | 57.77% | | 56.17% |
| CHANGE | 926,819 | 42.23% | | 41.06% |
| Total Valid Votes | 2,194,774 | 100.00% | | 97.23% |
| Informal Votes* | 62,469 | | | 2.77% |
| Total Votes | 2,257,243 | | | 100.00% |
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| Part B - If New Zealand were to change to another voting system, which voting system would you choose? |
| | Number of Votes | Percentage of Valid Votes | Percentage of Total Votes |
| First Past the Post (FPP) | 704,117 | 46.66% | | 31.19% |
| Preferential Voting (PV) | 188,164 | 12.47% | | 8.34% |
| Single Transferable Vote (STV) | 252,503 | 16.73% | | 11.19% |
| Supplementary Member (SM) | 364,373 | 24.14% | | 16.14% |
| Total Valid Votes | 1,509,157 | 100.00% | | 66.86% |
| Informal Votes* | 748,086 | | | 33.14% |
| Total Votes | 2,257,243 | | | 100.00% |
|