Is the conversion calculator accurate?

I am doing my first LCM meet and was wondering if the conversions are accurate. 50 free SCY to LCM: 26.8 converts to 31.16 100 free SCY to LCM: 1:01.75 converts to 1:11.55 I don't want to seed myself in a slow heat, but I'm almost sure I can do better than that.