Best FIRE Calculators in 2026: Honest Comparison

I Want To Retire Today

This is our tool, so take this with appropriate skepticism. The goal was to build the fastest possible FIRE calculator — five inputs, one button, answer in seconds. It runs 1,000 Monte Carlo simulations using historical return distributions and shows your projected retirement date, success probability, and sensitivity analysis (how each variable affects your timeline).

It also models Social Security impact, showing how delaying benefits changes your FIRE date. The tradeoff is depth: there's no tax optimization, no account-level modeling, no Roth conversion planning. If you need to model complex withdrawal sequences across multiple account types, this isn't the right tool.

Best for people who want a quick, credible answer to "when can I retire?" without spending an hour entering data.

FireCalc

FireCalc is the legacy standard in FIRE planning. It backtests your plan against every historical period since 1871, showing exactly how many of those periods would have supported your withdrawal rate. No Monte Carlo — just actual historical data. If your plan survives every 30-year window since the Grant administration, that's a strong signal.

The interface looks like it was built in 2005, because it was. There's no tax modeling, no account differentiation, and mobile support is minimal. But the core engine is solid and the methodology is transparent. Many FIRE bloggers still recommend it as the gold standard for historical backtesting.

Best for people who trust historical data over statistical models and want to see exactly how their plan would have performed in past market conditions.

cFIREsim

cFIREsim builds on FireCalc's approach with more flexibility. It supports advanced withdrawal strategies like Guyton-Klinger, Variable Percentage Withdrawal (VPW), and constant-percentage methods. If you want to test "what if I cut spending 10% in down years and increase 5% in up years," cFIREsim can model that.

The data can lag behind — historical returns sometimes aren't updated promptly, which matters if you're running simulations through recent years. The interface is functional but not polished. Like FireCalc, it uses historical backtesting rather than Monte Carlo.

Best for intermediate-to-advanced FIRE planners who want to compare withdrawal strategies beyond the standard 4% rule.

ProjectionLab

ProjectionLab is the best-looking financial planning tool in the FIRE space. It's privacy-first (no account linking required), supports Monte Carlo simulation, and handles Roth conversions, tax-bracket management, and multi-account withdrawal sequencing. The UI is genuinely well-designed, which is rare for financial tools.

The tradeoff is time and cost. Expect 30+ minutes for initial setup if you want accurate results, and it's $109/year after a free trial. The learning curve is moderate — it's powerful but not immediately intuitive for every feature. Built by an indie developer who's responsive to feedback.

Best for DIY financial planners who want professional-grade modeling without linking their accounts or hiring an advisor.

Boldin (formerly NewRetirement)

Boldin is the most comprehensive retirement planning tool available to consumers. Its Social Security Explorer lets you compare claiming strategies side by side. The Roth Conversion Explorer shows year-by-year tax impacts. It runs 5,000 Monte Carlo simulations and models pensions, rental income, part-time work, healthcare costs, and estate planning.

The depth comes at a cost: plan on spending an hour or more for initial setup, and the paid plan is $144/year. The free tier is limited enough that most serious users will need to upgrade. The interface has improved significantly from the NewRetirement days but can still feel overwhelming given the number of inputs.

Best for people within 5-10 years of retirement who need to optimize taxes, Social Security timing, and withdrawal sequencing across multiple accounts.

Empower (formerly Personal Capital)

Empower's retirement planner links directly to your financial accounts, pulling real balances and allocations. The tool runs 5,000 Monte Carlo simulations against your actual portfolio and lets you model spending changes, Social Security timing, and part-time income. The net worth dashboard and fee analyzer are genuinely useful free features.

The catch: Empower is a wealth management company. The free tools exist to funnel users into paid advisory services. If you have over $100k in investable assets, expect calls from advisors. Since the merger with Empower Retirement, users have reported bugs, slower performance, and some feature regressions. The "Free*" pricing comes with an asterisk for a reason.

Best for people who want their retirement projections updated automatically from linked accounts and don't mind the advisory sales pitch.