Retirement Calculator

Retirement planning is the process of estimating how much money you'll need to stop working and building a savings plan to get there. The core challenge is that you must accumulate enough during your working years to fund potentially three decades or more without a paycheck. A retirement calculator turns that abstract worry into concrete numbers.

The projection rests on a few key assumptions. Your contributions and existing balance grow at an assumed rate of return — historically, a diversified stock-and-bond portfolio has returned roughly 6–8% annually over long periods, though future returns are never guaranteed. Inflation, meanwhile, erodes purchasing power at around 2–3% per year, so a retirement calculator that adjusts for inflation shows your future balance in today's dollars, which is far more meaningful for planning.

A common rule of thumb is that you'll need to replace about 70–80% of your pre-retirement income each year. Another popular guideline, the "4% rule," suggests you can withdraw about 4% of your nest egg in the first year of retirement and adjust for inflation thereafter, with a reasonable chance the money lasts 30 years. Both are starting points, not guarantees — your actual needs depend on lifestyle, health, housing and any pension or government benefits.

Tax-advantaged accounts make a big difference. In the US, 401(k)s and IRAs let your money grow tax-deferred or tax-free; the UK has ISAs and pensions, Canada has RRSPs and TFSAs, and Australia has superannuation. Employer matches, where available, are effectively free money and should be captured in full.

The single biggest lever is time. Because of compounding, money invested in your twenties and thirties does far more heavy lifting than money invested later. If the calculator shows a shortfall, the most effective responses are usually to increase contributions, delay retirement slightly, or both. Revisit your plan yearly and adjust as your income, goals and circumstances change.