Hi there, I live in ontario, how do you calculate child support if custody is 50/50, one week with mom and one week with dad, how do you figure this out. Both of us work

The other variables are the amount of Dad's income, Mom's income, Dad's living expenses, and Mom's living expenses. To the extent there is an imbalance, the authorities will try to achieve 'balance', in my view. Check this: Ministry of the Attorney General - Child Support Guidelines