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Financial Calculators

401K Calculator

Modify the values and click the Calculate button to use

401(k) Balance: $1,727,364.45

Balance at Retirement
$1,727,364.45
In Today's Dollars
$613,876.65
Employee Contributions
$459,667.49
Employer Contributions
$68,950.12
Total Contributions
$528,617.61
Investment Returns
$1,163,746.84
Monthly Withdrawal
$9,471.72
Withdrawal in Today's Dollars
$3,366.09
33% Contributions67% Interest

401(k) balance by age

AgeContributionsInvestment returnEnding balance
31$8,742.96$2,336.62$46,079.58
32$9,005.25$3,008.50$58,093.33
33$9,275.41$3,736.63$71,105.37
34$9,553.67$4,524.89$85,183.92
35$9,840.28$5,377.36$100,401.56
36$10,135.49$6,298.40$116,835.45
37$10,439.55$7,292.67$134,567.67
38$10,752.74$8,365.08$153,685.48
39$11,075.32$9,520.87$174,281.68
40$11,407.58$10,765.64$196,454.90
41$11,749.81$12,105.29$220,310.00
42$12,102.30$13,546.14$245,958.44
43$12,465.37$15,094.87$273,518.69
44$12,839.33$16,758.61$303,116.63
45$13,224.51$18,544.91$334,886.05
46$13,621.25$20,461.81$368,969.11
47$14,029.89$22,517.86$405,516.85
48$14,450.78$24,722.11$444,689.75
49$14,884.31$27,084.22$486,658.27
50$15,330.83$29,614.41$531,603.52
51$15,790.76$32,323.58$579,717.86
52$16,264.48$35,223.26$631,205.60
53$16,752.42$38,325.73$686,283.74
54$17,254.99$41,644.02$745,182.75
55$17,772.64$45,191.97$808,147.36
56$18,305.82$48,984.28$875,437.45
57$18,854.99$53,036.54$947,328.99
58$19,420.64$57,365.35$1,024,114.98
59$20,003.26$61,988.27$1,106,106.51
60$20,603.36$66,924.01$1,193,633.88
61$21,221.46$72,192.38$1,287,047.72
62$21,858.10$77,814.44$1,386,720.26
63$22,513.85$83,812.54$1,493,046.64
64$23,189.26$90,210.40$1,606,446.30
65$23,884.94$97,033.21$1,727,364.45

What this 401K calculator does

This calculator projects the value of a 401(k) account from your current age, salary, current balance, contribution rate, employer match, and expected investment return. It also estimates a monthly withdrawal after retirement.

The model includes salary growth and an employer match with a salary-based limit. It does not apply annual IRS contribution limits or tax deductions in this version.

How to use this calculator

  1. Enter your current age, annual salary, and current 401(k) balance.
  2. Enter your contribution percentage of salary.
  3. Enter the employer match percentage and the salary percentage at which the match stops.
  4. Enter your retirement age, life expectancy, and expected salary increase.
  5. Enter the expected annual return and inflation rate.
  6. Click Calculate.

The default example starts at age 30 with a $75,000 salary and $35,000 balance, contributes 10% of salary, receives a 50% match on the first 3% of salary, and retires at 65.

401(k) formula

The calculator simulates the account month by month:

Employee contribution = Salary × Contribution rate / 12
Employer contribution = min(Employee contribution, Match limit) × Match rate
Ending balance = Beginning balance × (1 + monthly return) + employee + employer

Salary is assumed to grow each month at the annual salary increase rate. The employer match applies only to the part of the employee contribution that falls within the match limit.

What the results include

  • Balance at retirement: the projected account balance.
  • In today's dollars: the balance adjusted for inflation.
  • Employee contributions: the cumulative amount contributed by the employee.
  • Employer contributions: the cumulative match.
  • Total contributions: employee plus employer contributions.
  • Investment returns: the growth above contributions.
  • Monthly withdrawal: a withdrawal estimate through life expectancy, in nominal and today's dollars.
  • Balance by age: yearly contributions, investment return, and ending balance.

Assumptions and limitations

The calculator assumes a constant salary growth rate, investment return, and inflation rate. Contributions are made monthly at the end of each month. It does not model IRS contribution limits, catch-up contributions, vesting schedules, loans, taxes, or required minimum distributions. The employer match is assumed to be deposited at the same time as the employee contribution.

Frequently asked questions

How does the employer match work?

The match is a percentage of your contribution, limited to a percentage of salary. For example, a 50% match up to 3% of salary means the employer adds 50 cents for each dollar you contribute on the first 3% of salary.

Why is my balance different from a simple compound interest calculation?

The calculator includes salary growth, monthly contributions, and the employer match. Each of those changes the amount deposited and the time it has to grow.

Does this include 401(k) contribution limits?

No. The annual IRS limit, catch-up contributions, and plan-specific limits are not applied. The result is a projection of the inputs you enter, not a compliance calculation.

Are taxes included?

No. Traditional 401(k) contributions and withdrawals are not taxed in this version. Roth 401(k) treatment is also not modeled.

Source

References:

Disclaimer

This calculator is for informational and planning purposes only. It is not tax or investment advice. Confirm contribution limits and plan rules with your employer or a tax professional.

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