Yn unol â darlledwyr eraill, mae’r BBC yn defnyddio dadansoddiad yr Athro Colin Rallings a’r Athro Michael Thrasher, sy’n arbenigwyr yn y maes.
Maen nhw wedi dadansoddi data pleidleisio manwl er mwyn cyrraedd ffigyrau “tybiannol” ar gyfer pob etholaeth.
Er enghraifft, doedd sedd Caerfyrddin ddim yn bodoli yn 2019, ond mae Rallings a Thrasher wedi pennu mwyafrif tybiannol o 4,529 i’r Ceidwadwyr.
Dyma felly fydd man cychwyn dadansoddi’r canlyniad yn y sedd honno.
Mae’r mapiau a’r graffiau isod yn rhyngweithiol, felly mae modd clicio neu dapio arnyn nhw am fwy o wybodaeth.
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