TL;DR
If you want a fast financial independence estimate with no account and nothing to link, use the Calc Garden FIRE retirement calculator. It projects your retirement age from savings, monthly investing and target spend using the 4% rule, free and entirely in your browser. If you want a probability-weighted plan that pulls in every real account you own, the Empower retirement planner is also free and goes deeper. The genuine difference is not price; it is whether you want a quick standalone number or a full linked-account projection.
What the Empower retirement planner is
Empower, formerly Personal Capital, offers a free Personal Dashboard with a retirement planner built into it. You create an account, link your real bank, brokerage and retirement accounts, and the planner runs a Monte Carlo simulation across thousands of market scenarios to estimate the probability that your savings will support your target retirement lifestyle. It pulls in your aggregated net worth, lets you model retirement age, spending levels, Social Security and major planned expenses, and updates as your linked balances change. It is a genuinely capable tool and it costs nothing to use.
The trade-off is in how it is funded. Empower is a wealth-management firm, and the free dashboard is the front end of a paid advisory business. Once you link a meaningful balance, often in the six-figure range, you may be contacted about its managed-portfolio service, which charges an annual fee on the assets it manages. None of that makes the planner less useful, but it does mean two things some people would rather avoid: an account that aggregates all your finances in one place, and a sales path attached to the free tool.
What Calc Garden does instead
Calc Garden takes the opposite approach. The FIRE retirement calculator asks only for the numbers you choose to type: current savings, monthly contribution, an expected real return and the annual spend you want to fund. It applies the 25x rule, also known as the 4% safe withdrawal rule, and shows roughly when your portfolio reaches your FIRE number. There is no account, no email gate and no linking. Every figure is computed in your browser, so nothing you enter leaves your device or feeds a profile. The page lands with sensible defaults already filled in, so you see a result before you change a thing.
Empower retirement planner vs Calc Garden FIRE calculator
Both tools are free, so the table below is about fit rather than cost. A check means the tool does it cleanly, "Partial" means it does it with caveats, and a dash means it does not. The pricing row reflects each product as of 2026.
| Capability | Calc Garden | Empower planner |
|---|---|---|
| Price (as of 2026) | $0, no signup | $0, advisory-funded |
| No account or email required | Yes | No |
| No bank or brokerage linking | Yes | No |
| Inputs stay in your browser | Yes | No |
| No advisor contact funnel | Yes | No |
| Instant result with defaults filled in | Yes | Partial |
| Shows the formula used | Yes | No |
| Monte Carlo probability of success | No | Yes |
| Aggregates all your real accounts | No | Yes |
| Models Social Security and planned expenses | No | Yes |
Read that honestly: Empower wins on depth. Its Monte Carlo engine, account aggregation and Social Security modelling produce a far more detailed plan than a single-formula calculator can, and it is free to use. Calc Garden wins on the things that depth costs you, which are privacy, speed and the absence of a sales funnel. There is no "only free one" here, and we will not pretend otherwise.
When to pick each one
Reach for the Empower retirement planner when you want a probability-based answer that reflects your actual portfolio. If you are comfortable linking accounts and want to model Social Security, a spouse, taxable and tax-advantaged balances and one-off expenses, its simulation is worth the setup. It is the better tool for a serious, all-accounts retirement plan that you revisit over years.
Reach for the Calc Garden FIRE calculator when you want a quick, private estimate. It is ideal for sanity-checking a savings rate, comparing two scenarios in seconds, or working out a rough FIRE date before you decide whether a heavier tool is worth it. Because it never asks you to register or link anything, it is also the safer choice when you simply do not want your finances aggregated by a company that sells advisory services.
Go deeper with two related tools
A FIRE date is built on two forces, and Calc Garden has a focused tool for each. The compound interest calculator shows how a lump sum grows over time and makes the effect of your expected return obvious, which is the single input that moves a FIRE date the most. The savings goal calculator works the problem from the other end, telling you how long a target takes to reach from your balance and monthly deposits. Used together with the FIRE calculator, they let you stress-test a plan without linking a single account.
If you are weighing other free finance tools too, see our free alternative to NerdWallet and SmartAsset calculators and the full guides index.