Retirement Calculator

About the Retirement Calculator

A retirement calculator determines whether you are genuinely on track to retire comfortably — and if not, exactly what changes to your savings rate, expected investment returns, or retirement age will close the gap. Retirement planning is the most consequential long-term financial task most people face, yet surveys consistently show that the majority of Americans, Canadians, Australians, and UK residents are significantly behind on savings relative to what they will actually need. The problem is rarely a lack of intention — it is a lack of clear, personalised numbers that make the goal tangible. Our free retirement calculator turns abstract anxiety about the future into actionable data. Enter your current age, target retirement age, current savings balance, monthly contributions, expected investment return, and your desired annual retirement income, and the calculator shows you whether your trajectory reaches the goal, how much more you need to save monthly to get on track, and how sensitive the outcome is to different return rate assumptions. The calculator applies the widely accepted 4% safe withdrawal rule, which is the most thoroughly researched guideline in retirement planning. It derives from the work of financial planner William Bengen in 1994 and the subsequent Trinity Study: a diversified portfolio of stocks and bonds can sustain annual withdrawals of 4% of its starting value indefinitely — or for at least 30 years with very high probability across all historical market scenarios since 1926. This means your retirement target is approximately 25 times your desired annual retirement spending. If you want $60,000 per year in retirement income and expect $20,000 per year from Social Security, you need your investment portfolio to generate the remaining $40,000 — which requires a portfolio of $40,000 times 25, or $1,000,000. The calculator is designed to work for all major English-speaking markets: US savers with 401k, traditional IRA, Roth IRA, and Social Security projections; UK savers with workplace pensions, ISAs, and State Pension; Canadians with RRSPs, TFSAs, and CPP contributions; and Australians with superannuation as the primary vehicle. Each country's retirement system has different tax treatment and contribution rules, but the fundamental math of portfolio growth and withdrawal rates is universal.

How It Works

The retirement number formula applies the 4% safe withdrawal rule: Retirement Portfolio Needed = Desired Annual Retirement Spending multiplied by 25. This derives from Bengen's research showing that a diversified portfolio can sustain 4% annual withdrawals for 30-plus years with high probability across all historical scenarios. Example: you want $65,000 per year in retirement. Social Security will provide $22,000. Your portfolio must supply $43,000 per year. Portfolio needed = $43,000 x 25 = $1,075,000. Accumulation projection: if you are 38 years old with $120,000 currently saved, planning to retire at 65, and investing $1,800 per month at an assumed 7% annual return. Future value = 120,000 x (1.07)^27 plus 1,800 x 12 x [((1.07)^27 minus 1) divided by 0.07] = approximately $779,000 plus $1,507,000 = $2,286,000 total portfolio at retirement — well above the $1,075,000 target in this example, with comfortable surplus. Changing the return assumption from 7% to 5% drops the projected balance to approximately $1,480,000 — still adequate but with much less margin. These sensitivity calculations reveal how dependent retirement outcomes are on assumed returns.

Tips & Best Practices

• ✓Max out your employer 401k match before anything else — it represents an instant 50% to 100% return on matched contributions, depending on your employer's match formula. That is the best guaranteed risk-free return available anywhere, and leaving it on the table is a straightforward, preventable financial mistake.
• ✓The 4% safe withdrawal rule works well for a standard 30-year retirement at a 60/40 stock-and-bond allocation. For longer early retirements spanning 40 or more years, consider a more conservative 3.5% withdrawal rate, which requires a portfolio of 28.5 times annual spending to provide additional safety margin.
• ✓Social Security timing affects your required portfolio size dramatically: claiming at 62 permanently reduces monthly benefits by approximately 25-30% compared to waiting until your full retirement age. Each year you wait beyond full retirement age increases benefits by 8% — which is a guaranteed 8% risk-free return on the delay, hard to beat with any investment.
• ✓Healthcare costs are the most commonly underestimated retirement expense: the average retired American couple spends approximately $315,000 on out-of-pocket healthcare costs not covered by Medicare over a 20-year retirement. Build a specific healthcare line item into your retirement spending estimate rather than assuming Medicare covers everything.
• ✓Inflation erodes purchasing power relentlessly: $65,000 of income today will have the purchasing power of only approximately $36,000 in 20 years at 3% annual inflation. Use a real return assumption of 4-6% (nominal return minus inflation) rather than 8-10% nominal for more realistic, conservative retirement planning.
• ✓Roth conversion strategy: converting traditional IRA assets to Roth IRA during low-income years — early retirement before Social Security begins, or years with large deductions — reduces lifetime tax burden and eliminates Required Minimum Distributions at age 73, giving far more control over retirement income in later years.
• ✓Sequence of returns risk is the greatest threat to a retirement portfolio: two portfolios with identical average returns over 30 years can have vastly different outcomes depending on whether the bad years come early or late in retirement. Holding 2-3 years of living expenses in cash or short-term bonds protects against having to sell equities during market downturns.
• ✓Part-time work or consulting income in the first five to ten years of early retirement dramatically reduces portfolio withdrawal pressure during the highest-risk period. Even modest earned income in early retirement can add years of portfolio sustainability and significantly reduce the required FIRE number.

Who Uses This Calculator

People in their thirties and forties in the accumulation phase use the retirement calculator to determine whether their current savings rate is on track and to model the powerful impact of increasing contributions by just $100 to $500 per month over many years. Near-retirees in their fifties and early sixties use it to finalise their retirement date by comparing projected portfolio values at 62, 65, and 67, and to model how Social Security claiming age affects their required portfolio size. Younger savers in their twenties use it for the motivating exercise of seeing how small monthly contributions compound into significant wealth over 40-plus years — often the most powerful argument for starting immediately rather than waiting. Financial advisors use retirement projections in client reviews to demonstrate progress toward goals and to model scenarios for major decisions like selling a business, receiving an inheritance, or relocating to a lower-cost city. FIRE enthusiasts use the calculator with aggressive savings rates and earlier retirement ages to calculate their personal financial independence number and timeline.