When Can I Retire? Calculator

Most retirement calculators ask you to name a target retirement age, then tell you whether you're on track. This calculator works in reverse: you enter your current savings, annual contributions, and planned spending — it finds your earliest possible retirement age.

The difference matters. If you've been using a 4% safe withdrawal rate for a planned retirement at 48, you've been underestimating your FI number. A 47-year horizon requires a lower safe withdrawal rate — which means a higher FI number and potentially a later retirement date than you calculated. This calculator applies the right rate for each possible retirement age automatically.

When Can I Retire Calculator

Enter your numbers below. The calculator searches every age from your current age to 70, finds the first one where your projected portfolio covers your FI number at the appropriate safe withdrawal rate, and shows you the full sensitivity picture.

Why the retirement age is the right output — not years to FI

The conventional FIRE calculator flow is: pick a retirement age → check whether you're on track. That works well if you've already decided you want to retire at, say, 52. But most people in the planning phase don't have a committed target — they want to know the answer. When is the earliest I can do this?

The question matters because the SWR is a function of retirement age, and retirement age is what you're solving for. A flat 4% rule overstates your withdrawable income for horizons longer than 30 years. If the calculator above shows your earliest retirement at 47, using 4% would underestimate your FI number by about 7% — roughly $175,000 on a $70,000/yr spending plan. That's not a rounding error.

The three levers that move your retirement age

1. Annual spending (biggest lever)

Spending determines two things simultaneously: how large your FI number has to be, and how fast you can save. Every dollar of spending you reduce does double duty — it shrinks the target and frees up more to contribute. That's why the spending sensitivity table above often shows 3–5 year swings from a 10–15% spending change.

This doesn't mean austerity. It means clarity. Most early retirees find that when they actually track spending (vs. estimate it), they're spending 10–20% less than they guessed — often in discretionary categories they don't particularly value. Running your real spending numbers through the calculator is more useful than running aspirational ones.

2. Annual contributions (second biggest lever)

On a 15–20 year accumulation timeline, contributions often matter more than returns. The math: if you have $400,000 and save $40,000/year, your contributions represent 10% of your current portfolio per year — roughly as impactful as investment return. If you have $200,000, contributions dominate even more. Returns increasingly dominate only once the portfolio is large relative to annual savings — typically when you're within 5–7 years of FIRE.

This is why income increases (promotion, side income, career pivot) have such a powerful effect early in a FIRE timeline. A $20,000/year income increase, fully invested, can accelerate a 52-year-old target to 49 — three years of your life, in exchange for a sustained increase in contribution rate.

3. Investment return (smaller lever than most people expect)

Return matters, but it's the least controllable variable and has a smaller impact on typical 10–20 year timelines than people assume. Moving from 4% to 6% real return with a $400K portfolio and $40K/yr contributions saves about 3–4 years on a 17-year timeline — meaningful, but less than a modest spending reduction. Asset allocation (how much equity vs. bonds) affects expected return; the higher equity allocation generally produces higher expected return but also higher sequence-of-returns risk in early retirement. See Asset Allocation for Early Retirement for the glidepath framework.

Pre-59½ access: what to know if your answer is under 59½

Most people accumulating for early retirement have the bulk of their savings in 401(k)s and IRAs — accounts with a 10% penalty for withdrawals before age 59½. If the calculator shows your earliest retirement below that threshold, you need a bridge strategy. Here are the four options in rough order of planning lead time required:

For most early retirees targeting before 55, the Roth conversion ladder combined with a taxable brokerage bridge is the most flexible approach. Start conversions as soon as you retire — ideally in Year 1 — so the 5-year seasoning clocks run in parallel with your bridge drawdown.

Healthcare before 65: the line item that doesn't show up in most FIRE calculators

Retirement spending estimates often leave out healthcare — particularly the gap between when you retire and when Medicare starts at 65. This is a real budget item and it interacts directly with your ACA subsidy eligibility.

In 2026, an unsubsidized silver ACA plan for a 55-year-old runs $900–$1,400/month for a single person ($10,800–$16,800/year).² The subsidy threshold is $63,840 MAGI for a single filer (400% of the federal poverty level).³ An early retiree who keeps MAGI below this level with careful income management — drawing from Roth accounts and taxable brokerage below the 0% LTCG threshold — can reduce that number to $0–$250/month. A retiree slightly over the cliff pays full freight.

The interaction: Roth conversions increase MAGI. Managing the Roth ladder and keeping MAGI below the ACA cliff simultaneously is one of the primary planning challenges in early retirement. See Healthcare Before 65 for the full framework and Withdrawal Order for Early Retirees for the tax-sequencing approach.

Social Security and your retirement age

Social Security isn't part of this calculator because it's a binary: you either count it or you don't, and most early retirees in accumulation shouldn't build their FIRE plan around SS income. Reasons:

• Zero-earnings years. Every year you retire early creates a zero in your SS earnings record. SS calculates benefits from your 35 highest-earning years — zero-fill years drag the benefit down. Someone retiring at 40 after 18 working years gets a significantly lower SS benefit than their income history suggests. The calculator at Social Security for Early Retirees shows the exact impact.
• Claiming flexibility. The decision of when to claim (62 vs. 67 vs. 70) should be separate from your FIRE number. SS is a valuable sequence-of-returns hedge — starting it during a down market in your early 70s can dramatically extend portfolio longevity.
• Trust fund uncertainty. Planning a 50-year retirement around an income stream whose trust fund is currently projected to face a 20% benefit cut in the late 2030s introduces a planning dependency you can't model with certainty.

That said, if you have a pension or rental income that meaningfully covers retirement spending, you should reduce your "annual spending" input by that amount to get an accurate FI number.

What moves the needle most — and where a fee-only advisor helps

The calculator above identifies when you can retire. What it doesn't optimize is the sequence of decisions between now and then that can move that date 2–5 years earlier:

• Which accounts to contribute to in which order (traditional vs. Roth at current vs. expected marginal rates)
• When to start a Roth conversion ladder and at what annual conversion amount
• How to structure a taxable brokerage bridge (asset location, tax-loss harvesting, 0% LTCG harvesting)
• Whether the Rule of 55 is available for your plan — and whether rolling over before 55 would eliminate it
• How to sequence income in early retirement to stay below the ACA cliff and IRMAA thresholds
• Whether a period of Barista FIRE or semi-retirement gets you to FIRE faster than grinding to full FI

These decisions compound. Getting the account contribution order right over a 10-year accumulation period can be worth $80,000–$150,000 in after-tax wealth — more than most fee-only planning fees for a decade.

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