I guess my point was, there are not enough input variables. Maybe I’m not understanding the assumptions.

Another example with the same result.

Your $2,400,000 in savings gives you approximately 365 days of freedom per year (at your current spending level of $24,000 per year).

This means that your savings could support you (without you having to work) through December 31 each and every year.

An additional day of freedom requires you to increase your savings by $6575.

You're not including ALL of the inputs in your bug reports. If you put in 1% as your SWR, this is the expected result. If anything, seems like there are too many inputs - if the 4% withdrawal rate was just hard-coded, there would be no confusion, but then, some of us are planning on 3% or 5% or 8%, so then we couldn't try out different withdrawal rates.

This "days per year bought / still needed" is very simple - it is the fraction of your "number" that you already have times 365 (number of days in a year). So if you're planning on a 4% withdrawal rate for a 40K / year spend in retirement, your number is $1,000,000 ($40,000 / .04). If you currently have $500,000, then you've got 50% of the $1,000,000 required number. So you've got 182.5 days per year covered forever.

This isn't C-Firesim - it is a simple calculator for the metric that this particular thread proposes.