The Retirement Calculator projects how savings grow to retirement and how long that nest egg lasts once withdrawals begin. Enter current savings, contributions, expected return, years to retirement, and a withdrawal plan, and the Retirement Calculator returns the balance at retirement, years the savings can fund, and a sustainable monthly income under the assumptions entered.
Retirement planning asks two linked questions: how large the balance becomes, and whether that balance supports spending for the retirement horizon. The Retirement Calculator answers both with time-value math. Tax rules, contribution limits, Social Security, and pensions change over time, so every result is a planning estimate rather than a fixed entitlement.
*These results are estimates for information only, not financial, tax, or retirement advice. Assumed returns, inflation, and tax rules change; confirm current rules and personal circumstances with a qualified professional.*
Plan your retirement savings
The Retirement Calculator plans retirement savings by combining a starting balance, ongoing contributions, and an assumed return over the years until retirement. The nest egg at retirement is the accumulation of those inputs; changing any one of them changes the ending balance.
A simple illustration: $50,000 already saved, $500 contributed each month, a 6% annual return, and 25 years to retirement produce a much larger ending balance than contributions alone, because compound growth acts on both the starting sum and each deposit. The Retirement Calculator compounds under a constant-rate path for clarity. Real markets vary year to year; a smooth 6% line is a planning assumption, not a forecast of any specific fund.
State the return, inflation, and contribution assumptions on every run. Hidden assumptions are how retirement estimates lose trust. Pair this general planner with account-specific tools such as the 401(k) Calculator and IRA Calculator on QuickCalculators when employer plans or IRA limits matter.
Grow your savings to retirement
The Retirement Calculator grows savings to retirement with future-value mathematics on both the starting balance and the contribution stream. Accumulation treats ongoing contributions as a regular annuity that earns the same assumed annual rate until the chosen retirement date arrives.
Future value of a present balance is FV = PV x (1 + i)^n. Future value of regular contributions uses the ordinary annuity future-value formula. Adding those pieces gives the projected nest egg. Example path: $10,000 today at 7% for 20 years alone becomes about $38,697 before any new contributions; adding $300 monthly over those 20 years at the same rate adds a large second component. The Retirement Calculator combines both so the contribution habit and the starting balance each show their effect.
Contribution room in tax-advantaged accounts is limited by current law and can change. Enter a contribution the household can fund and that fits current limits; the Retirement Calculator does not certify legal maximums for any tax year.
Find out how long your savings last
The Retirement Calculator finds how long savings last by applying a chosen withdrawal to the nest egg until the balance reaches zero (or a set remainder). Drawdown is the spending phase: the same time-value math runs in reverse as money leaves the account.
If retirement begins with $600,000 and withdrawals are $30,000 per year (about $2,500 per month) with a 5% return on the remaining balance, the account lasts many years longer than a zero-return spend-down, because earnings offset part of each withdrawal. At a 0% return, $600,000 / $30,000 = 20 years exactly. With positive returns, years funded rise; with higher withdrawals, years funded fall. The Retirement Calculator reports years funded under the withdrawal and return entered.
Longevity risk cuts both ways: outliving the plan or dying with a large unused balance. Stress-test withdrawals at lower returns and longer horizons rather than relying on a single optimistic path.
Find your sustainable monthly income
The Retirement Calculator finds sustainable monthly income as the withdrawal the nest egg can support for a stated retirement horizon at an assumed return. Sustainable income is the spending level that depletes the balance on schedule rather than in year five or year fifty by accident.
A common planning guideline is drawing about 4% of the starting balance in the first year (the "4% rule" family of heuristics), so $600,000 would suggest about $24,000 per year, or $2,000 per month, before inflation adjustments. That guideline is not a guarantee; sequence of returns, fees, and spending shocks change outcomes. The Retirement Calculator can also solve from a fixed horizon: the annuity payment that exhausts a present balance over n years at rate i. For example, a $600,000 balance, 25-year horizon, and 5% return supports a higher monthly income than the same balance at 3%, because earnings help fund the payments.
Tax on withdrawals from traditional accounts reduces spendable income. Roth qualified withdrawals and taxable brokerage sales follow different tax rules. Model after-tax spending outside or beside this growth-and-drawdown view, and confirm current tax rules because they change.
Frequently asked questions
What does the Retirement Calculator estimate?
The Retirement Calculator estimates savings at retirement, how long those savings last at a chosen withdrawal, and a sustainable monthly income under stated return and horizon assumptions. Results are planning estimates, not guarantees.
How does savings growth to retirement work?
Savings growth compounds the starting balance and contributions at an assumed return for the years until retirement. The Retirement Calculator uses future-value math for both pieces. Real returns vary; the constant rate is an assumption.
How long will retirement savings last?
Savings last until withdrawals and fees exhaust the balance, offset by any return earned on the remainder. The Retirement Calculator reports years funded for the withdrawal and return entered. At 0% return, years funded is starting balance divided by annual withdrawal.
What is a sustainable monthly income in retirement?
Sustainable monthly income is the withdrawal level the nest egg can support for the planned retirement horizon at the assumed return. The Retirement Calculator solves for that payment under those inputs. Heuristics such as about 4% of starting balance per year are guidelines only and can fail under poor markets or long lifespans.
Do tax rules affect these results?
Tax rules affect contributions, growth location, and withdrawals. The Retirement Calculator focuses on pre-tax or nominal balance paths unless tax is built into the inputs. Contribution limits, required distributions, and tax rates change; confirm current rules with official sources or an advisor.
How does this relate to 401(k), IRA, and Roth tools?
This page is the general savings-and-longevity planner. The 401(k) Calculator, IRA Calculator, and Roth IRA Calculator on QuickCalculators focus on specific account types and limits. Use the general planner for the household picture and the account tools for product-level detail.
Are investment returns guaranteed?
Investment returns are not guaranteed. The Retirement Calculator applies the rate entered as a constant for math clarity. Stress-test lower rates and higher inflation before treating a single run as the plan.
Summary
The Retirement Calculator grows current savings and contributions to a nest egg at retirement, then tests how long that balance lasts and what monthly income it can sustain under stated returns and horizons.
Accumulation uses future-value math; drawdown uses depletion and annuity payment logic, so $600,000 withdrawn at $30,000 per year lasts 20 years at 0% return and longer when earnings continue.
Guidelines such as drawing about 4% of starting balance are planning heuristics, not promises. Tax rules, contribution limits, and market returns change, so every figure is an estimate for information only, not retirement advice.