[allsunny]

I love the simplicity and the look of the UI. Unfortunately I think the simplicity means that very important parameters are being left out. Ideally, you should be able to specify estimated return rate and estimated inflation rate. Also, specifying the draw down rate would be nice... I've poured through a lot of these calculators recently as I've begun to get interested in FIRE... I think the most simple (but good) one is the AARP calc if you want a simple example.

Finally, and I think this is where it really falls short - this calculator is WAY TOO OPTIMISTIC out of the gate. I just cross checked it w/ my own calculations - it doesn't add up. Its "conservative" estimate is way higher than my "optimistic" plan (10% return / 3% inflation based on a passive index investing strategy)