Retirement Calculator

Plan your retirement nest egg and estimate how long your savings will last.

About Retirement Calculator

This free retirement calculator uses the future value (FV) formula to project your retirement savings based on your current age, current savings, monthly contributions, and expected rate of return. It then applies the 4% safe withdrawal rule to estimate your monthly retirement income and calculates how many years your savings will last given your desired income and inflation.

4% Rule Integration

Uses the widely recommended 4% safe withdrawal rate to estimate sustainable retirement income from your nest egg.

Inflation Adjusted

Accounts for inflation to show your real purchasing power in retirement, not just nominal dollars.

Gap Analysis

See immediately if your savings trajectory is on track or if you need to increase contributions to meet your goals.

Free & Private

No sign-up, no data storage. All calculations run in your browser using standard financial formulas.

📋 Common Use Cases

Retirement Planning

Project your nest egg at retirement age based on current savings, monthly contributions, and expected returns. Adjust variables to see when you can comfortably retire.

Goal-Based Saving

Calculate how much to save monthly to reach a specific target — college fund, house down payment, or emergency fund — by your desired deadline.

Compare Investment Strategies

Test different asset allocations and return rates. See how a 1-2% difference in annual returns compounds into significant differences over decades.

Windfall Planning

Decide between lump-sum investing vs dollar-cost averaging an inheritance or bonus. Let the numbers show which approach maximizes your long-term returns.

🪜 How to Use This Tool

  1. Enter your starting point
    Input your current savings balance, expected monthly contribution, and investment time horizon in years.
  2. Set your expected return rate
    Choose a realistic annual return based on your investment strategy. Conservative portfolios might use 4-6%, aggressive ones 8-10%.
  3. Review growth projections
    See year-by-year growth, total contributions vs investment earnings, and your final balance. Charts visualize how compound interest accelerates over time.
  4. Test what-if scenarios
    Try different contribution amounts, return rates, or time horizons. Small changes early in your career compound into massive differences at retirement.

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Frequently Asked Questions

Are these calculators really free?▼
Yes. All calculators on iluv.tools are completely free. No signup, no account, no credit card required. Every calculation runs instantly in your browser.
Is my data sent anywhere?▼
Absolutely not. All calculators are pure client-side JavaScript. Your numbers, dates, and inputs never leave your browser. No server processing, no tracking.
How accurate are these calculators?▼
Calculators use standard mathematical formulas with double-precision floating point. Results match industry-standard financial and scientific calculations.
Can I use calculators on mobile?▼
Yes. All calculators work on mobile browsers (iOS Safari, Android Chrome) with responsive layouts.