Free Retirement & FIRE Calculator

Retirement Calculator & FIRE Calculator

A free, AI-assisted retirement planning calculator that runs hundreds of Monte Carlo simulations over 50+ years of real market history — so you can find the retirement age you can actually afford, estimate your earliest FIRE date, and stress-test Social Security, taxes, and Roth conversions. No signup, no credit card.

Launch the Retirement Calculator →

Why a Monte Carlo retirement calculator beats a simple one

Most retirement planning tools assume one fixed return every year — say 7% — and draw a smooth line. Real markets don't work that way. A bad run of returns early in retirement (sequence-of-returns risk) can drain a portfolio that a fixed-return calculator would call perfectly safe. Our retirement calculator instead samples jointly from 1975–2025 stock, bond, and inflation history, preserving how those move together, and reports a success probability with percentile outcome bands rather than a single falsely-precise number.

Estimate your FIRE age (Financial Independence, Retire Early)

The built-in FIRE calculator answers the question every early-retirement planner asks: how soon can I stop working? It sweeps candidate retirement ages and finds the earliest one where your plan still clears a high success target, then shows how four levers change that date:

• As planned — your earliest FIRE age on current inputs.
• Growth portfolio — a higher stock allocation and its effect on the date.
• Leaner spending — how trimming expenses accelerates independence.
• Both combined — the aggressive early-retirement path.

Each scenario has a one-click Apply so you can fold it straight into your plan and re-run — a real simulated comparison, not generic advice.

Find the retirement age you can afford

Enter your savings, expected spending, and income, and the calculator returns the earliest retirement age at which your plan clears your target success probability. Compare retiring at 55 versus 62 on the exact same simulations, and see the trade-off in success rate and ending balance.

Social Security, taxes, and Roth conversions built in

• Social Security optimizer — compare claiming ages (62–70) for you and a spouse, including survivor benefits, on the same set of runs.
• Roth conversion planner — sweep tax-bracket ceilings and age windows to find a conversion schedule that lowers lifetime taxes and future RMDs.
• Tax-aware engine — federal brackets, state tax, RMDs, IRMAA Medicare surcharges, NIIT, and long-term-care shocks are modeled, not hand-waved.
• Today's-dollars view — results default to real (inflation-adjusted) purchasing power so the numbers stay intuitive.

How to use the retirement calculator

1. Enter your current age, target retirement age, and savings across taxable, Roth, and 401(k)/IRA accounts.
2. Set your expected annual spending — optionally with go-go / slow-go / no-go phases.
3. Add Social Security estimates and any other income.
4. Run the simulation to see your success probability, and open the Strategy Lab for FIRE age, Social Security, and Roth conversion optimizers.

Start planning your retirement →

Frequently asked questions

What is the best free retirement calculator?

One that uses Monte Carlo simulation over real market history rather than a single fixed return, and that accounts for taxes, RMDs, and Social Security. FinoAgent's retirement calculator does all three, free and without a login.

How does the FIRE estimate work?

It projects your savings forward with contributions and market growth, then finds the earliest age your portfolio can sustain your spending at a high success rate — and shows how allocation and spending changes move that date.

When should I claim Social Security?

It depends on longevity, other income, taxes, and spousal benefits. The calculator's claim-age optimizer compares ages 62–70 on the same simulations so you can see the trade-off directly.

Are Roth conversions worth it in retirement?

Often, especially in lower-income years before RMDs and Social Security begin. The Roth conversion planner sweeps bracket ceilings and age windows to find a schedule that lowers lifetime taxes.