Retirement Calculator

About the Retirement Calculator

A retirement calculator determines whether you are on track to retire comfortably — and if not, exactly what changes to your savings rate, expected returns, or retirement age will get you there. Retirement planning is the most important long-term financial task most people face, yet surveys consistently show that the majority of Americans are significantly behind on savings. Our free retirement calculator models your path to financial independence using your current savings, monthly contributions, expected investment returns, target retirement age, and desired retirement income. It applies the widely-accepted 4% safe withdrawal rule — meaning your portfolio should be approximately 25 times your desired annual retirement spending to have a high probability of never running out of money over a 30-year retirement. The calculator is designed for US savers (401k, IRA, Roth IRA, Social Security) and international users in the UK (pension, ISA), Canada (RRSP, TFSA, CPP), and Australia (superannuation). It shows your projected portfolio at retirement, whether your target is achievable, and how sensitive the outcome is to different assumptions about investment returns and inflation.

How It Works

The retirement number formula: Retirement Portfolio Needed = Desired Annual Retirement Spending x 25. This derives from the 4% safe withdrawal rule — research by Bengen (1994) and the Trinity Study showed that a diversified portfolio can sustain 4% annual withdrawals for 30+ years with high probability across historical market scenarios. Example: you want $60,000/year in retirement income. $60,000 x 25 = $1,500,000 target portfolio. If you expect $20,000/year from Social Security, you only need your portfolio to provide $40,000/year: $40,000 x 25 = $1,000,000 target. Now the projection: if you have $150,000 saved today, are 40 years old, plan to retire at 65, and invest $1,500/month earning 8% annual return: FV = 150,000 x (1.08)^25 + 1,500 x 12 x [((1.08)^25-1)/0.08] = $1,027,000 + $1,233,000 = $2,260,000 — exceeding the $1,000,000 target comfortably.

Tips & Best Practices

• ✓Max out your employer 401k match before anything else — it is an instant 50-100% return on matched contributions, the best risk-free return available anywhere. Leaving employer match money on the table is a guaranteed financial mistake.
• ✓The 4% safe withdrawal rule works for a 30-year retirement at a 60/40 stock/bond allocation. For longer retirements (retiring at 55), a more conservative 3.5% withdrawal rate (portfolio = 28.5x annual spending) provides higher safety.
• ✓Social Security timing: claiming at 62 versus 67 permanently reduces monthly benefits by approximately 25-30%. Waiting until 70 increases benefits by 8% per year above full retirement age — worth modelling for your specific situation.
• ✓Healthcare cost planning: the average retired couple in the USA spends approximately $315,000 on healthcare costs in retirement not covered by Medicare. Build this into your retirement spending estimate explicitly — it is the most commonly underestimated retirement expense.
• ✓Inflation erodes purchasing power: $60,000 today will have the purchasing power of only $33,000 in 20 years at 3% inflation. Use a real return assumption (nominal return minus inflation) of 5-7% rather than 8-10% nominal for more realistic planning.
• ✓Roth conversion strategy: converting traditional IRA assets to Roth during low-income years (early retirement before Social Security, or years with large deductions) reduces lifetime tax burden and eliminates Required Minimum Distributions.
• ✓The sequence of returns risk is the single greatest retirement planning risk: two portfolios with identical average returns can have drastically different sustainability depending on whether bad years come early or late in retirement. Hold 2-3 years of spending in cash/bonds as a buffer.
• ✓Part-time work in early retirement: working even 10-15 hours per week at a modest wage in the first 5-10 years of retirement dramatically reduces portfolio withdrawal pressure during the highest sequence-of-returns-risk period.

Who Uses This Calculator

People in their 30s and 40s in the accumulation phase use the retirement calculator to determine whether their current savings rate is on track and to model the impact of increasing contributions by $100-500/month. Near-retirees in their 50s and 60s use it to finalise their retirement date by comparing projected portfolio values at different retirement ages and optimising Social Security claiming strategy. Younger savers in their 20s use it for the motivating exercise of seeing how small monthly contributions compound into significant wealth over 40+ years. Financial advisors use it in client reviews to demonstrate progress toward retirement goals and to model scenarios for major decisions like selling a business, receiving an inheritance, or downsizing a home. HR departments run retirement calculators in employee financial wellness programmes to increase 401k participation rates. Couples planning joint retirement model different scenarios for different retirement dates and income combinations. FIRE (Financial Independence, Retire Early) enthusiasts use aggressive return and savings rate assumptions to calculate their personal FIRE number and timeline.