MCPCalc

401(k) Calculator

Calculate retirement account growth with employer match and annual contributions.

Scratchpad (not saved)

$

Your current 401(k) balance

$

Your gross annual salary

%

Percentage of salary you contribute

%

Employer matches this % of your contribution

% of salary

Employer matches up to this % of your salary

%

Expected annual investment return

years

Years until you plan to retire

Advanced
%

Expected annual raise percentage

What This Calculator Does

Estimate retirement account growth from employee contributions, employer match policy, and expected long-term return assumptions.

It combines Current 401(k) Balance, Annual Salary, Your Contribution, Employer Match to estimate Projected Balance at Retirement, Your Contributions, Employer Contributions.

Formula & Method

Core equations: Each year the balance grows by: B_{t+1} = \left(B_t + \frac{C_t}{2}\right)(1 + r) + \frac{C_t}{2} where C_t is the total annual contribution (employee + employer match) and r is the annual return. Salary grows at a user-specified rate each year. Inputs are applied in base units, then derived metrics are computed from the same equations and rounded for display.

Notation used in the formulas: R = Projected Balance at Retirement; x_{1} = Current 401(k) Balance; x_{2} = Annual Salary; x_{3} = Your Contribution; x_{4} = Employer Match; x_{5} = Match Limit; x_{6} = Expected Annual Return.

Method summary: inputs are normalized to consistent units, core equations are evaluated, then secondary values are derived and rounded for display.

Use this when deciding contribution rates and evaluating whether you are capturing full employer match value.

Inputs Used

  • Current 401(k) Balance: Your current 401(k) balance
  • Annual Salary: Your gross annual salary
  • Your Contribution: Percentage of salary you contribute
  • Employer Match: Employer matches this % of your contribution
  • Match Limit: Employer matches up to this % of your salary
  • Expected Annual Return: Expected annual investment return
  • Years to Retirement: Years until you plan to retire
  • Annual Salary Increase: Expected annual raise percentage

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