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Retirement Savings Calculator

Estimate your retirement savings growth and how long it will last.

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Inputs

$
$

Your values stay on this device.

Results

Total at Retirement
Total Interest Earned$1,215,834.89
Years to Grow35

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Assumptions

  • Calculated locally from the inputs shown in this report.

Sensitivity preview

Current Age -10%: Total at Retirement $1,839,559.65

Current Age Current: Total at Retirement $1,475,834.89

Current Age +10%: Total at Retirement $1,180,825.39

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About this Retirement Calculator

Will you have enough money to retire comfortably? This calculator helps you project the future value of your savings based on your current age, retirement goals, and investment returns.

How to use this calculator

  1. Enter your Current Age and expected Retirement Age.
  2. Input your Current Savings and Monthly Contribution.
  3. Set an Annual Return (7-8% is a standard historical average for stocks).
  4. The result shows your total Nest Egg at retirement.

Accuracy and testing

Review formula sources, default test cases, assumptions, unit handling, rounding rules, and changelog for this calculator.

View accuracy page

How this calculator works

The calculator applies compound interest to your initial balance and uses the Future Value of an Annuity formula for your monthly contributions over the number of years until retirement.

Inputs explained

Current Age

Your age today.

Retirement Age

The age you plan to stop working and start withdrawing funds.

Monthly Contribution

How much you save each month (including employer match).

Annual Return

The expected yearly growth rate of your investments (inflation-adjusted or nominal).

Understanding your results

The Total at Retirement is your estimated portfolio value. The Total Interest Earned highlights the power of compound growth—often, the interest exceeds your actual contributions.

Example scenarios

Starting at 30

Save $500/mo at 7% return until age 65. Result: ~$880,000.

Starting at 45

Save $500/mo at 7% return until age 65. Result: ~$260,000. Starting 15 years later costs you over $600k in potential growth.

Key Features

  • Future Value Projection
  • Interest vs Principal Breakdown
  • Long-term Compounding

Things to Keep in Mind

Assumes a constant rate of return every year, which does not reflect actual market volatility. Does not account for taxes or inflation explicitly.

Tips & Best Practices

  • Increase your contributions by 1% every year to keep up with raises.
  • Don't invest too conservatively when you are young. Time allows you to ride out market volatility for higher returns.
  • Use 'real' return rates (e.g. 7% instead of 10%) to account for inflation purchasing power.

Glossary of Terms

Nest Egg
The total amount of money saved for retirement.
Compound Interest
Interest calculated on the initial principal and also on the accumulated interest of previous periods.
Time Horizon
The number of years you have to invest before you need the money.

Frequently Asked Questions

How much do I need to retire?
A common rule of thumb is the 4% Rule: you need 25 times your annual expenses. If you spend $40,000/year, you need $1 Million.
What is a safe rate of return?
Using 6-7% is considered a safe, conservative estimate for long-term stock market growth adjusted for inflation.
Does this include Social Security?
No, this calculator projects your personal savings only. Social Security would be additional income on top of this.