Calculating monthly income

[marzipan13]

My employer pays us bi-weekly, and the paycheck is dated like a month in retro.
I'm trying to calculate my monthly gross income, but if I take the YTD gross income on my stub and divide it by the number of months (5 months), it comes out a lot higher than what I think I make each month.
I am a salaried employee, but I've taken a lot of leave without pay this year (traveling overseas to help with my husband's visa process), so I know I make about $1k-$2k less than my salary.
How do I calculate my monthly salary?
Should I take my paystubs from last 5 months, figure out how much I've made each month, add it all up and divide by 5?
Would that be the same for my tax/medical deductions?

[JRScott]

You need to take the paystubs for the last 6 months and add them together then divide by 6 for each of the following: Gross Income, Taxes, Insurance, Net Income.

Keep in mind if you are paid biweekly that means you get 26 pay checks a year, not 24.......