Can anyone administer me the formula for calculating paying a mortgage rotten rash ?

I'm really no good at math!
I need to know how to amount the formula if I pay extra a month how long in years will it purloin to pay per my interest rate if I pay a $100 extra a month on a 30 yr mortgage at 5% interest how plentiful years to payoff? formula please to calculate this?

Thank so much!
Answers:
here ya step...better than a formula, its a calculator http://www.mortgageloan.com/calculator/m…
Try using this nifty mortgage calculator: http://www.bankrate.com/calculators/mort…
If you make the equivalent of 1 extra pay-out per year, the 30 year mortgage is shortened approximately 3 years for each extra payment per year......
Can't answer your question since we do not know the amount of your loan. I did that on a 150k mortgage and paid it rotten in 15 yrs.

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