1) does it calculate all your capital will be gone when you are (gone, I mean);
2) if trying to keep in 'today's dollars', dont forget to wind down the rate of return a bit as part of this is always natural CPi increase eg 3% pa
I think just save what yo can or want to, have a good time along the way, invest for growth to have time work for you and keep an eye on any 'bubbles' along the way (which isn't always easy!). Most people I think tend to retire with more than they are prepared to spend and die leaving it for the kids. Which is fine if you want to do that for 'em.
