How many human years to a cat year

Both my cats are about 2 years old unfortunately idk there esact age I'm just wondering how old they are in cat years? And for future reference how many cat years is there to a human year

I found this, which appears to be in line with other charts I've seen:
http://cats.about.com/cs/healthissues/a/agechart.htm

I found this somewhere on the web and checked with my vet, who said it was pretty accurate.  A 1-month-old kitten = 6-month-old human baby; 3-month-old kitten = 4-year-old child; 6-month-old kitten = 10 human years old and an 8-month-old kitten = 15-year-old human

For older cats:

Cat’s Age (Human Years)

2  (24)

3  (29)

4  (35)

5  (38)

6  (42)

7  (46)

8  (50)

9  (55)

10 (60)

11 (65)

So your two-year-old is around 24 years old in human years. 

Thank you