Tax calculator: PAYE + Self Employed

Hi All

Would anyone know if there is a tax calculator that can handle PAYE and self employed in one go? Want to know how much I need to put aside for NI and tax now, rather than get a painful number next year.

Until November, I was part time with additional freelance earnings. From November I've been full freelance. I've got the relevant tax documentation from my former employer.

I'm already registered for self assessment with HMRC and filed my first return in the FY to April 2016.

Appreciate any steer you all can give! Happy to use an excel calculator if one is floating about, but haven't been able to google anything up so far.