Retirement Calculator

What a retirement calculator actually shows you

A retirement calculator projects how much money you'll accumulate by the time you retire, based on your current savings, monthly contributions, employer match, expected investment return, and inflation rate. Rather than guessing whether you're on track, a retirement savings calculator gives you a concrete number — year by year — so you can make informed decisions today about how much to save and when you can realistically retire.

This free online retirement calculator factors in the variables that matter most: starting balance, monthly contributions, employer match (the free money your company adds to your 401k), expected annual return, and an inflation rate so you can see what your projected balance is worth in today's purchasing power. You get both the nominal projected balance and an inflation-adjusted figure — the two numbers that matter most for real retirement planning.

How to use this retirement calculator

Start by entering your current age and target retirement age. Then input your current retirement savings balance — find this in your 401k or IRA account portal. Enter your monthly contribution amount (check your most recent paystub for the exact dollar withheld) and your employer match percentage from your benefits documentation.

For annual return, 7% is a reasonable long-run assumption for a diversified stock portfolio. Use 2.5–3% for inflation. Click calculate to see your projected balance at retirement, your inflation-adjusted balance in today's dollars, total contributions, and total compound growth. Scroll down for the full year-by-year table showing your balance at every age. Adjust any input and results update instantly — no page reload, no server call.

How this compares to Bankrate and calculator.net

Bankrate's retirement calculator and calculator.net are both solid, but both are ad-heavy and the results pages push you toward financial product recommendations. NerdWallet's tool embeds fund ads. SmartAsset's calculator harvests your email for advisor leads. This tool does none of that. There's no account, no ads, no data collection, and no product pitch waiting at the end.

The main practical difference is the year-by-year table. Most competing calculators show you a final number and maybe a chart. This one shows your exact balance at every age, so you can see precisely when you cross $500k, $1M, or whatever milestone matters to you. That granularity is useful for planning catch-up contributions or deciding whether to retire at 62 versus 65.

Retirement savings tips that actually move the needle

The most powerful first move: capture the full employer match. If your employer matches 50% of contributions up to 6% of salary, contribute at least 6% — anything less leaves free money on the table. Fidelity found the average American leaves $1,336 per year uncaptured by under-contributing to get the full match.

After the match, consider opening a Roth IRA (2025 limit: $7,000) for tax diversification, then return to maximizing your 401k. Automate contribution increases — many plans let you set an auto-escalation that raises your rate by 1% each year. Even delaying retirement by two or three years adds disproportionately large amounts to your balance because those years keep compounding while you're no longer making withdrawals. Run this calculator with different retirement ages to see the difference a few extra years makes.

Private, instant and free — no sign-up required

All calculations run in your browser using JavaScript. No data is sent to a server. You don't need to create an account or provide an email address. The calculator works on desktop, tablet, and mobile — so you can run retirement scenarios on your phone without installing an app.

Bookmark this page and come back whenever your income changes, you get a raise, or you want to model a different retirement age. Each time, results are instant and private. If you want to save a specific scenario, bookmark the URL — your inputs are preserved in the page state.

The 4% rule and safe withdrawal rates explained

The 4% rule originates from financial planner William Bengen's landmark 1994 research, in which he analysed historical US market data going back to 1926 and found that a retiree could withdraw 4% of their portfolio in the first year of retirement — then adjust that amount for inflation each subsequent year — and survive any 30-year period without running out of money, provided the portfolio was invested 50–75% in equities. The Trinity Study (1998), conducted by three professors at Trinity University, independently confirmed this finding using portfolio-survival simulations across rolling historical windows, cementing the 4% figure as the canonical safe withdrawal rate for mainstream retirement planning.

Many planners now recommend a more conservative 3–3.5% withdrawal rate for two reasons. First, bond yields are structurally lower today than in Bengen's historical dataset, which means the bond portion of a balanced portfolio generates less income to cushion equity drawdowns. Second, life expectancy has risen: a couple retiring at 65 today has a meaningful probability that at least one partner will live into their 90s, meaning the portfolio may need to last 35 years or more rather than 30. A 3.5% rate raises the required nest egg by roughly 14% compared to 4%, but it also raises the probability of success substantially for long retirements.

The most underappreciated risk in retirement planning is sequence-of-returns risk: the order in which investment gains and losses occur matters enormously when you are withdrawing from the portfolio. Two retirees with identical 30-year average returns can end up with dramatically different outcomes if one retires into a bull market and the other retires into a bear market. The retiree who experiences large losses in the first few years of retirement is forced to sell more shares at depressed prices to fund living expenses — permanently eroding the portfolio's ability to recover even when markets rebound. This is why holding one to two years of expenses in cash or short-term bonds at the point of retirement is a common risk-management strategy, allowing you to avoid selling equities into a downturn.

The retirement corpus formula: how much is actually enough

The retirement corpus formula is straightforward: divide your expected annual retirement expenses by your chosen withdrawal rate. Using the 4% rule, the formula is: required corpus = annual expenses ÷ 0.04. If your household needs £40,000 per year in retirement, you need £40,000 ÷ 0.04 = £1,000,000. At a more conservative 3.5% withdrawal rate, the same £40,000 annual need requires £1,143,000. At 3%, it requires £1,333,000. The choice of withdrawal rate has a far larger impact on your savings target than most people appreciate — a 1-percentage-point reduction in your assumed safe withdrawal rate increases the required corpus by 33%.

Critically, this formula applies to expenses not covered by guaranteed income sources. If you receive a State Pension or Social Security of £10,000 per year and your total expenses are £40,000 per year, only £30,000 needs to come from your investment portfolio. Your required corpus therefore falls to £30,000 ÷ 0.04 = £750,000 — a £250,000 reduction purely from accounting for guaranteed income. Pensions, annuities, and rental income all function the same way: subtract them from annual expenses before applying the formula, since they do not need to be funded from the portfolio.

The formula must also account for inflation between now and retirement. If you retire in 25 years and current annual expenses are £40,000, those same expenses at 3% annual inflation will cost approximately £83,600 in nominal terms at retirement. A corpus that looks adequate in today's money may be materially insufficient if the calculation ignores this purchasing-power erosion. This is why this calculator shows both a nominal projected balance and an inflation-adjusted balance in today's pounds/dollars — comparing the inflation-adjusted figure against your current annual expenses gives a genuinely meaningful picture of retirement readiness.

Retirement account types by country: 401(k), SIPP, EPF and beyond

In the United States, the primary vehicles are the 401(k) (employer-sponsored, pre-tax contributions reduce current taxable income, withdrawals taxed as ordinary income) and the Roth 401(k) (post-tax contributions, tax-free withdrawals in retirement). The 2025 employee contribution limit is $23,500, with a $7,500 catch-up contribution available from age 50, bringing the total to $31,000. The combined employee-plus-employer ceiling is $70,000. Individual Retirement Accounts (IRAs) offer a second tax-advantaged layer: $7,000 per year ($8,000 if 50+), with the Roth IRA the preferred choice for those who expect higher future tax rates. Traditional 401(k) and IRA accounts are subject to Required Minimum Distributions (RMDs) starting at age 73, forcing withdrawals even if you do not need the income — Roth IRAs have no lifetime RMD requirement during the owner's life, making them valuable for estate planning.

In the United Kingdom, the equivalent of the 401(k) is the Self-Invested Personal Pension (SIPP) for individual savers and the workplace pension for employees. Since 2012, auto-enrolment requires employers to enrol eligible workers in a workplace pension with a minimum combined contribution of 8% of qualifying earnings (3% employer + 5% employee). The Lifetime ISA (LISA) offers a 25% government bonus on contributions up to £4,000 per year until age 50, but the funds must be used for a first home purchase or retirement after age 60 — withdrawing for any other purpose incurs a 25% penalty that claws back both the bonus and a portion of your own contributions. UK pension contributions benefit from tax relief at your marginal rate, making them highly efficient for higher-rate taxpayers.

In India, the primary retirement instruments are the Employees' Provident Fund (EPF) — mandatory for salaried employees, currently earning 8.25% interest (FY 2023-24) and both employee and employer contribute 12% of basic salary — the National Pension System (NPS) with Tier I (locked until retirement) and Tier II (flexible withdrawals) accounts, and the Public Provident Fund (PPF). PPF has a 15-year lock-in period with partial withdrawal allowed from year 7, and enjoys EEE tax treatment — contributions qualify for Section 80C deduction, interest is tax-free, and the maturity amount is tax-free. This triple exemption makes PPF one of the most tax-efficient savings instruments available in India, though the annual contribution cap of ₹1.5 lakh limits how much can be sheltered there.

Inflation and FIRE: the two forces reshaping retirement planning

Inflation is the slow-motion threat that most retirement calculators underweight. A household spending £1,000 per month today will need £1,806 per month in 20 years and £2,427 per month in 30 years just to maintain the same standard of living, assuming a modest 3% annual inflation rate. A corpus calculation that plugs in today's expenses without adjusting for inflation will underestimate the required nest egg by 80–140% depending on the time horizon. The distinction between nominal return (what your portfolio earns before inflation) and real return (what it earns after inflation is stripped out) is fundamental: a 7% nominal return with 3% inflation delivers only a 4% real return — and it is the real return that determines whether your purchasing power grows or erodes over a 30-year retirement.

One practical response to inflation in retirement is the bucket strategy: partitioning the portfolio into three time-horizon buckets. Bucket 1 holds one to two years of living expenses in cash or money-market funds — no investment risk, always available, insulating you from being forced to sell equities at the wrong time. Bucket 2 holds three to ten years of expenses in bonds and conservative balanced funds — some growth, moderate volatility, refills Bucket 1 periodically. Bucket 3 holds the remainder in growth equities — highest long-term return, highest short-term volatility, but with a decade-plus horizon before withdrawals are needed the short-term swings are manageable. The bucket approach addresses both sequence-of-returns risk and inflation simultaneously.

The FIRE movement (Financial Independence, Retire Early) applies these principles to an accelerated timeline. The intellectual roots trace to Vicki Robin and Joe Dominguez's 1992 book Your Money or Your Life, which reframed money as stored life energy and challenged conventional consumerism. The movement gained mass reach through the Mr. Money Mustache blog (launched 2011), which demonstrated that aggressive savings rates of 50–70% of income could compress the working career to 10–15 years. FIRE practitioners target a 25× annual expenses nest egg (the inverse of the 4% rule). Variants include leanFIRE (frugal lifestyle, smaller corpus), fatFIRE (high-spending early retirement requiring a larger corpus), coastFIRE (accumulate enough early that compound growth alone will reach the target by traditional retirement age without further contributions), and baristaFIRE (partially retire with part-time or gig income covering day-to-day expenses while investments compound). Because FIRE retirements may span 40–50 years rather than 30, most FIRE planners use a 3–3.5% withdrawal rate rather than 4% to account for the extended horizon and the higher exposure to sequence-of-returns risk over a longer drawdown period.