Investment Calculator

What is the Investment Calculator?

This calculator shows what a lump sum or regular investment is worth after a given period of time, assuming compound interest or market returns. It answers one of the most common financial questions people have: "If I invest X amount for Y years at Z percent, what do I end up with?" Whether you're putting money into a Vanguard index fund, a brokerage account on Fidelity, or a high-yield savings account, CalciHub's investment calculator runs the math instantly. You can test one-time investments, regular monthly contributions, or both combined.

How Does It Work?

The calculator uses compound interest, where your returns earn returns. The formula for regular contributions is:

FV = PV × (1 + r)ⁿ + PMT × [((1 + r)ⁿ − 1) / r]

FV = Future value of your investment

PV = Initial investment (lump sum, can be zero)

r = Interest/return rate per compounding period

n = Number of compounding periods

PMT = Amount added each period (monthly contribution)

How to Use CalciHub's Investment Calculator

1. Enter your initial investment amount (or zero if you're starting fresh).

2. Add a monthly contribution if applicable.

3. Set your expected annual return rate.

4. Choose the investment period in years.

5. Select compounding frequency (monthly is standard for most investment accounts).

Tip: Compare results using 6%, 8%, and 10% return rates. This range covers most diversified equity portfolios over the long term, and seeing all three scenarios helps you plan conservatively.

A Quick Example

Emma, a 28-year-old in New York, puts $5,000 into a Vanguard index fund and plans to add $300 every month for 25 years. She uses a conservative 7% annual return.

Initial investment: $5,000

Monthly contribution: $300

Annual return: 7%

Time period: 25 years

Total contributed: $95,000

Projected value: $262,400

Emma's $95,000 in contributions more than doubles thanks to compounding. The longer she holds it, the more dramatic that gap becomes.

Frequently Asked Questions