I have been just browsing this site for a few months now but have a question regarding saving

Seems everywhere I read there is a chart of formula for retiring early:

Save 40% and retire in 18 years

Save 50% and retire in 14 years

Save 60% and retire in 11 years

I get the formula but I need help with the calculations.

Let’s say this year I made $112,000 at my day job.

- Contributed $24,000 in my 401K (over 50)

About $32,000 Taxes (SS, Fica, fed, state)

After all that my take home was around $56,000

For argument sake let’s say I have $4,000 more in the bank then I did the prior year.

So I saved $28K --------- 4K in savings and 24K in 401K

Here’s where I am confused:

1: I took home $56K and saved $28K therefore I saved 50% (nice! I’ll retire in 14 years,,,,, but wait)

2: I made $112,000 and saved $28K therefore I saved 25% (yikes 25 years to retire!)

What the heck! Lol

Let’s get some clarification on this! I can’t be the only one??