Each new seat can be described as a combination of parts of old seats. These table show this decomposition. The winner of the old seat at the 2010 election is shown by party colour, as is the implied winner of the new seat.
The implied results are now calculated using the local election results for the wards which make up each old seat. This should be more accurate than the earlier implied results which assumed each constituency was homogeneous.
| New seat | Primary component | Secondary component(s) |
|---|---|---|
| Altrincham and Sale West | 100% of Altrincham and Sale West | 10.2% of Stretford and Urmston |
| Blackley and Broughton | 85.7% of Blackley and Broughton | 23.8% of Manchester Central |
| Manchester Central | 76.2% of Manchester Central | 13.2% of Ashton under Lyne |
| Manchester Gorton and Reddish North | 85.8% of Manchester Gorton | 16.1% of Denton and Reddish |
| Manchester Withington | Unchanged | |
| Salford and Eccles | Unchanged | |
| Stretford and Urmston | 89.8% of Stretford and Urmston | 14.2% of Manchester Gorton |
| Worsley and Eccles South | Unchanged | |
| Wythenshawe and Sale East | Unchanged |
| New seat | Primary component | Secondary component(s) |
|---|---|---|
| Ashton-under-Lyne and Denton | 63.9% of Ashton under Lyne | 53.8% of Denton and Reddish |
| Cheadle | 86.5% of Cheadle | 17.1% of Stockport |
| Hazel Grove and Poynton | 82.6% of Hazel Grove | 16.0% of Macclesfield
13.5% of Cheadle
|
| Heywood and Middleton | Unchanged | |
| Oldham East and Saddleworth | 88.2% of Oldham East and Saddleworth | 22.8% of Oldham West and Royton |
| Oldham West | 77.2% of Oldham West and Royton | 22.9% of Ashton under Lyne
11.8% of Oldham East and Saddleworth
|
| Rochdale | Unchanged | |
| Stalybridge and Hyde | 100% of Stalybridge and Hyde | 14.4% of Denton and Reddish |
| Stockport | 82.9% of Stockport | 17.4% of Hazel Grove
15.7% of Denton and Reddish
|
| New seat | Primary component | Secondary component(s) |
|---|---|---|
| Bolton North and Darwen | 72.6% of Bolton North East | 34.5% of Rossendale and Darwen |
| Bolton South East | 100% of Bolton South East | 14.2% of Bolton North East |
| Bolton West | 100% of Bolton West | 13.2% of Bolton North East |
| Bury North | 100% of Bury North | 9.9% of Bury South |
| Bury South | 90.1% of Bury South | 14.3% of Blackley and Broughton |
| Leigh | Unchanged | |
| Makerfield | Unchanged | |
| Wigan | Unchanged |