Axioma offers you a simple calculator to assess your saving needs in order to get the monthly income required at retirement.
Learn and earnchatroom

To use this calculator, you should specify your current age. If you are married and
you have a working spouse, you should specify your spouse age. The accepted
range of age is between 18 and 65.
If you are single or your wife does not work you do not have to specify data in the
spouse column.

To make this exercise easy and let you use amounts in current
(today's) dollars, we have fixed the inflation rate to 3%.

N.B.: To maintain your standard of living you will need 60 to 70% of your current
family income.
  You Spouse
What’s your age ? (E.g.: 35)
At what age do you intend to retire ? (E.g.: 65)
How much do you need monthly at retirement to maintain your current standard of living? (E.g. 60% * current income=1000 US$)$$
How much will you monthly receive, at retirement, from social security or other resources? (E.g. 200 US$) $$
How much can you monthly save in order to prepare your retirement ? (e.g.: 100 U$) $