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How to Choose a Retirement Planning Tool: Seven Questions to Ask

Every retirement calculator claims to run “thousands of simulations” and give you “your real number.” Most of the marketing language sounds identical from one to the next, so it doesn't tell you much. These seven questions do — they're the ones that actually separate one tool from another, and you can answer all of them in a few minutes on any tool's own site before you type in a single real number.

1. How does it actually simulate the future?

“Runs Monte Carlo simulations” appears on nearly every retirement tool's marketing page, and it hides a real methodological difference. Some tools use parametric Monte Carlo — they fit a statistical curve (roughly, a bell curve) to historical average return and volatility, then draw random samples from that curve. Others use a historical bootstrap: each simulated year draws an actual U.S. market year at random from real data (MangoDime goes back to 1928), so the real messiness of history — fat tails, genuinely bad stretches — comes through directly instead of through a smoothed approximation. A few tools offer both and let you choose. Neither approach is wrong, but a parametric model can understate how bad a truly bad sequence can get — ask which one you're looking at.

2. What does it model — and what does it admit it doesn't?

Any real plan touches Social Security claiming strategy, taxes (including required distributions and Medicare's IRMAA surcharge), healthcare before Medicare eligibility, a mortgage or rental property, and — if you're married — your spouse's own timeline. Nearly every tool claims to handle all of this at some level. The more useful question isn't whether a feature is mentioned, but whether the tool tells you plainly where its own modeling stops. See what MangoDime doesn't model yet as one example of that kind of list — a tool confident in its own methodology usually publishes one.

3. Do you need to link your bank account to get a real number?

Tools that link accounts — Empower does this centrally; Boldin and ProjectionLab offer it optionally — use aggregators like Plaid, which use read-only, bank-grade connections rather than sharing your actual login credentials with the app. It's a real, widely-used approach, and it saves you from updating balances by hand. It's still a third party holding that connection, though, and it's worth deciding on purpose rather than by default. A tool that never asks removes the question entirely, at the cost of updating your own numbers yourself when they change.

4. What's actually free, and what requires a subscription?

“Free” means different things from one tool to the next. Some let you build a full plan at no cost and gate only the advanced ranking/optimization tools behind a subscription. Some are free to use outright, monetized instead through a referral into paid wealth management once your numbers look like a lead worth converting. Some require an annual subscription with no free tier at all beyond a teaser number. Ask specifically: what result can I see today, for nothing, with no card on file?

5. Can you see a real number before creating an account?

This is a fast, practical filter. Some tools require a free account before showing any real output; some show you a demo persona's numbers and gate your own behind signup; a smaller number let you get an actual number from nothing but your own inputs, immediately. If you want to test a tool's methodology before handing over an email address, this tells you in under a minute whether you can.

6. What happens to your data?

With no account, does the tool store anything at all? With one, what specifically — your email, the figures you enter, a history of past inputs? Can you delete it, and does deleting it actually delete it, or just hide it? A privacy policy that answers these plainly, in plain language, is worth more than one that doesn't address them.

7. Does it tell you what to do, or show you what your choices produce?

This is the question that matters most and gets asked least. A calculator or planning tool is not a financial advisor — it can rank options and show what each one produces for your own numbers, but it can't (and legally shouldn't) tell you which one to pick for your specific situation. Verbs like shows, ranks, compares, and estimates are a good sign. Language like should, we recommend, or the right move is is worth a second look coming from a piece of software rather than a licensed person.

Where does MangoDime fit?

None of these seven questions has one universally right answer — tools trade differently between depth, cost, and convenience, and the right choice depends on what you actually need. Our own answers: a historical bootstrap of 5,000 simulated retirements back to 1928; a plain, dated public list of what we don't model yet; no bank linking, ever; the full plan free today with no paywall on any of it; a real number before you create an account; nothing stored until you choose to save it; and ranking, never advice. See what your own retirement paycheck actually looks like for the full mechanics behind our number specifically. If you want a first, free, no-signup number to bring with you while you evaluate whichever tool you end up choosing — start here.

Frequently asked questions

Should I use more than one retirement planning tool?

It's one of the more useful sanity checks available. Run the same real inputs through two independent tools — if they land in a similar range, that's a real signal; if they don't, the gap usually traces back to one of the seven questions above (a different simulation method, a different depth of tax modeling, or a different assumption neither tool made obvious).

Is a free tool as good as a paid one?

Depends what “good” means for you. A free tool that's honest about what it models and doesn't model can be more useful than a paid one that hides its assumptions behind a slicker interface. Price tends to track feature depth and support more than it tracks accuracy.

What if a tool won't tell me what it doesn't model?

Treat that as information in itself. A tool confident in its own methodology usually says so plainly; one that doesn't may not have thought it through, or would rather you not ask before you subscribe.

Do I need to link my bank to use MangoDime?

No, and you can't — MangoDime has no bank linking today. Every number is one you type in yourself. See question 3 above for how that trade-off plays out across tools generally.

How much do I actually need to retire?

There's no single number like “$1 million” that applies to everyone — how much you need depends on your monthly spending, not your net worth. See how much you actually need to retire for why, and how to find your own real number instead of a rule of thumb.

By the MangoDime team · Last updated September 19, 2026