One of the best things about my recent vacation was that I only spent about half the amount of money I had saved for spending money. Because of this, I just made an extra payment of $1000 towards my car loan!!! I'm really excited about this. I have been searching the internet trying to find a loan calculator to help me figure out how much interest and time I have shaved off by doing this but I can't find one! All the calculators I have found only calculate using extra monthly payments and there is no option to enter a one time extra payment. :( If anyone knows of one out there please let me know!