401(k) Calculator — Retirement Balance Projection

Enter Your Details

Current Age

Retirement Age

Current 401(k) Balance ($)

Monthly Contribution ($)

Employer Match (%)

Match Limit (% of salary)

Expected Annual Return (%)

About 401(k) Calculator

VestCalc's 401(k) Calculator is a free online retirement planning tool designed to help individuals at every career stage model their financial future with clarity and confidence. Whether you are just starting to save for retirement or approaching your target retirement date, this calculator lets you visualise how your current contributions, employer matching, investment returns, and time horizon combine to build long-term wealth.

Retirement planning is one of the most important financial decisions you will make yet most people underestimate how early they need to start and how dramatically small changes in contribution rate or return assumptions affect their final balance. Our 401(k) Calculator makes these relationships visible with instant recalculation as you adjust inputs, empowering you to test different strategies and understand their real-world impact.

Key variables modelled include current savings balance, annual contributions, employer match percentage, expected annual return, inflation adjustments, and years until retirement. The tool calculates projected balances, total contributions versus investment growth, and monthly income projections in retirement giving you a complete picture of your financial trajectory.

VestCalc is committed to making professional-grade financial planning tools accessible to everyone. This 401(k) Calculator is completely free, requires no account, and stores none of your data. Use it as often as you like to model different scenarios adjusting your savings rate, retirement age, or return assumptions and make informed decisions about your financial future.

Frequently Asked Questions

Why should I test more than one return assumption in this 401k Calculator?

Long-term projections are sensitive to return and inflation assumptions. Run conservative and optimistic cases so the result shows a range instead of a single fragile estimate.

How accurate are the projections in 401(k) Calculator?

401(k) Calculator uses standard financial formulas and compound interest calculations. Results are estimates based on the assumptions you enter and should be used for planning purposes alongside professional financial advice.

Can I adjust the assumptions in 401(k) Calculator?

Yes. 401(k) Calculator lets you change key inputs including contribution amounts, expected return rates, retirement age, and time horizon to model different scenarios for your retirement plan.

Does 401(k) Calculator account for inflation?

401(k) Calculator allows you to enter an inflation rate assumption so your projections reflect the real purchasing power of your future savings, not just the nominal balance.

Is my financial data stored when I use 401(k) Calculator?

No. 401(k) Calculator performs all calculations locally in your browser. No financial information you enter is sent to or stored on any server.

Related Calculators

Reviewed by the VestCalc Editorial Team · Updated August 8, 2026

401(k) projection method and checks

The projection compounds the current balance and recurring contributions over the years entered by the user. Employer match is modeled from the contribution and match inputs; actual plans can cap matches by compensation, contribution rate, eligibility, or vesting rules that this simplified model does not reproduce.

Verify the current balance and contribution on a recent plan statement, confirm the match formula in plan documents, and run lower-return and later-retirement cases. Investment returns are uncertain and the output does not include every fee, tax rule, withdrawal rule, or market sequence.

Official sources and further reading

This calculator is an educational scenario tool. It does not provide individualized financial, investment, tax, legal, lending, or insurance advice.