Investment Calculator – Project Growth, Taxes & Inflation

Use this free investment calculator to estimate future investment value, compare before-tax and after-tax results, account for inflation, and view projected growth by year.

Investment Calculator

Enter your goal, time horizon, starting amount, returns, and contributions to estimate future investment growth.

Investment Goal Calculator

What is your total investment goal? How many years do you have to save? How much will you initially invest? What is your expected rate of return on investment? (%) How often will you contribute to your investment goals? How much will your periodic contribution be? Compounding frequency

Additional information

Inflation rate (%) Federal marginal tax rate (%) State marginal tax rate (%) State taxes are deductible on your federal return

Total investment fund

$0

Before taxes

After taxes

After taxes & inflation

Projected growth by year

Tax deferred growth Taxable growth

How to Use

Enter your investment goal, years to save, and initial investment.
Add your expected annual return and periodic contributions.
Choose how often you contribute and how often the investment compounds.
Optionally add inflation and tax details for adjusted results.

How This Calculator Works

This investment calculator projects your total portfolio value over time using your starting balance, expected annual rate of return, recurring contributions, compounding frequency, and optional tax and inflation adjustments.

Frequently Asked Questions

What is an investment calculator?

An investment calculator estimates how much your money may grow over time based on returns, compounding, and contributions.

What is the difference between before-tax and after-tax results?

Before-tax results show projected growth without taxes, while after-tax results subtract estimated taxes from taxable gains.

Why include inflation?

Inflation-adjusted results show the estimated purchasing power of your future money rather than just the nominal balance.

Related Tools

How this calculator works

This calculator determines your estimated investment earnings over a selected time period. We calculate your total investment before and after taxes and inflation. Totals are rounded to the nearest dollar.

A common measure of inflation in the U.S. is the Consumer Price Index (CPI), which has a long-term average of around 3% annually. Over the last 50 years, the highest CPI recorded in the U.S. was 13.5% in 1980. This calculator defaults to a 2.9% inflation rate.

Deposits are assumed to occur at the beginning of each contribution period so that each contribution starts earning immediately.

These calculations are hypothetical and future rates of return cannot be predicted with certainty. Results can vary due to investment risk, volatility, and market behavior.

Definitions

Investment goal: Your target total investment value.
Years to save: Number of years planned to reach your goal.
Initial investment: Starting amount already invested.
Compound interest: Interest earned on both principal and previously earned interest.
Rate of return on investment: The expected annual return from your investments.

Federal marginal tax rate table (2024)

Tax rate	Single	Head of household	Married filing jointly / qualifying widow	Married filing separately
10%	$0 to $11,600	$0 to $16,550	$0 to $23,200	$0 to $11,600
12%	$11,601 to $47,150	$16,551 to $63,100	$23,201 to $94,300	$11,601 to $47,150
22%	$47,151 to $100,525	$63,101 to $100,500	$94,301 to $201,050	$47,151 to $100,525
24%	$100,526 to $191,950	$100,501 to $191,950	$201,051 to $383,900	$100,526 to $191,950
32%	$191,951 to $243,725	$191,951 to $243,700	$383,901 to $487,450	$191,951 to $243,725
35%	$243,726 to $609,350	$243,701 to $609,350	$487,451 to $731,200	$243,726 to $365,600
37%	$609,351 or more	$609,351 or more	$731,201 or more	$365,601 or more

Source: IRS — 2024 Income Tax Brackets