Start with the fixed costs, because they don't move with the tenant: the mortgage payment at your actual rate, property tax billed by the City of Saskatoon, insurance, and a maintenance reserve for the furnace, roof and appliances that will eventually need replacing regardless of who is living there.
Then get a real number for the rent side, not a guess. A property manager or a handful of comparable rentals in similar condition and location will tell you more than a national or provincial average, since two units a few blocks apart can rent for very different amounts depending on condition and suite legality.
If the gap between those two numbers is thin or negative, selling outright may beat holding, and that comparison starts with knowing what the house is actually worth today. Get your hand-reviewed valuation from Joel Dyck.