Debt Consolidation - Repayment Help ( AUS )

Hey Guys,

I Have taken a lot of advice from here which has been immensely helpful, so first off, thank you.

I have just consolidated all my debt into one loan with a lower Interest rate ( I believe it about 10-13%) This has freed the budget up about 300 a fortnight which I want to used to pay the loan off quicker.

Is there a calculator online somewhere, where I can input my precise figures and work out how much quicker Ill pay the loan off with an extra $300 a fortnight ?

Total Loan - $51k Total Fortnight Payments over 5 Years - $570 Proposed Payments - $870