Here is the thing almost every retirement calculator hides: for retiring early, your total nest egg is rarely what breaks the plan — the years before Social Security and Medicare are. That gap, funded entirely from your portfolio, is where early retirements quietly fail. This tool puts it in the centre, not a footnote — then lays your own answers about life after work back out so the real trade-off is visible instead of looping in your head. No happiness score. No regret percentage.
Most of them — the big ones included — answer "how do I save my way to a number by 67?" and end on a projected balance, often next to a "match with an advisor" button. Useful if you're 35 and accumulating. Not the question if you're standing at the decision now. This one assumes you have a number and asks the harder thing: does it survive the bridge years, and what are you actually walking toward? It states one honest assumption — your withdrawal rate — out loud and lets you move it, instead of burying a return forecast in the fine print.
No simulation, no Monte Carlo, no projected returns dressed up as certainty. Just the withdrawal-rate math, stated openly, with the assumption visible and yours to change.
These never become a "happiness score." There is no model that can turn four sliders into how good your retirement will feel. They get reflected back so you can see the shape of what you're walking toward.
This is the honest version of "what if I cut one expense": not a gimmick, just the same arithmetic at three stated withdrawal rates so you can see how much of the answer rests on a number nobody can actually predict.
Not scored, not summed. Just placed side by side so you can look at them without the loop.