Investment Calculator: Building Wealth the American Way
Americans are largely responsible for funding their own retirement. Social Security helps, but it wasn't designed to be your only income. Whether you're contributing to a 401(k), maxing out a Roth IRA, or building a taxable brokerage account, understanding how your money grows over time is crucial. That's what our Investment Calculator shows you.
The Power of American Retirement Accounts
The US has some of the most tax-advantaged retirement accounts in the world. Understanding them is key to building wealth.
401(k) Plans
Employer-sponsored, often with matching contributions (free money). Contributions are pre-tax, reducing your taxable income now. You pay taxes when you withdraw in retirement. 2024 limit: $23,000 (plus $7,500 catch-up if 50+).
Roth IRA
Contributions are after-tax, but growth and withdrawals are tax-free. Incredible for young workers in low tax brackets. 2024 limit: $7,000 (plus $1,000 catch-up if 50+).
Traditional IRA
Similar to 401(k) tax treatment but not employer-sponsored. Useful if you don't have a 401(k) or want additional tax-deferred space.
See how your investments can grow with the Investment Calculator.
The Math That Matters
$500/month invested at 7% annual return:
- After 10 years: $86,000 (you contributed $60,000)
- After 20 years: $260,000 (you contributed $120,000)
- After 30 years: $610,000 (you contributed $180,000)
The longer your money compounds, the more time does the heavy lifting. Starting at 25 instead of 35 can mean hundreds of thousands more at retirement.
What Return Should You Expect?
- S&P 500 historical average: ~10% nominal, ~7% after inflation
- Bond funds: 4-6%
- Money market/savings: 4-5% currently
- Real estate (REITs): 8-12% historically
A diversified portfolio typically targets 7-8% long-term real returns.
The Early Start Advantage
An 18-year-old investing $200/month until 65 will likely have more than a 35-year-old investing $500/month until 65. Time beats amount almost every time.
Run your own projections with the Investment Calculator.
Related Tools
The Salary Calculator shows your take-home pay. The Mortgage Calculator helps balance home buying with investing.
Frequently Asked Questions
How does the investment calculator project long-term wealth growth?
The Investment Calculator uses compound interest to project future value based on initial investment, monthly contributions, expected returns, and time horizon.
What is a realistic rate of return to use for retirement planning?
Historical S&P 500 returns average 10% before inflation, 7% after. For conservative planning, use 6-7%. Your actual results will vary year to year.
How much should Americans save for retirement?
The general rule is 15% of income including employer match. Use the Salary Calculator to understand your take-home pay first.
What other financial tools help with wealth building?
The Mortgage Calculator for real estate investment analysis and our full calculator suite for various financial decisions.
