Lacunoide, Oanda has a quite "custom" MT4 setup and they don't calculate the swaps the same way as other brokers. Swaps are charged/paid by oanda for the REAL time you hold the position (second by second), not once every night for a whole day. So, swaps do NOT appear in Oanda's MT4 list of instruments.
Swaps are published on their website. There is the interest calculator you found, but you can't find CFDs in it (http://fxtrade.oanda.co.uk/analysis/interest-calculator)
Or, you can use their Historical rate calculator, which gives you the actual rates too, of all products: http://fxtrade.oanda.co.uk/analysis/historical-rates
Swaps are published on their website. There is the interest calculator you found, but you can't find CFDs in it (http://fxtrade.oanda.co.uk/analysis/interest-calculator)
Or, you can use their Historical rate calculator, which gives you the actual rates too, of all products: http://fxtrade.oanda.co.uk/analysis/historical-rates