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If I Had Bought Stock Planner

This calculator shows what an investment in a stock would have grown to between the dates you enter. It does not look up historical prices. Enter the share price on the purchase date and the share price on the end date from a source you trust, along with how much you invested and how long you held it.

Your numbers

Your plan is ready.
Shares you would have bought 
Value on the end date 
Dollar gain or loss 
Total price return 
Average yearly price return 

Scenario table

Each row changes one number by a tenth, and keeps the rest as you entered them.

ScenarioShares you would have boughtValue on the end date

Scenario chart

The first result for each scenario, drawn to scale.

How to use this planner

Enter your numbers in the boxes. The results update as you type, using the same calculation as the calculator.

The scenario table shows what changes when one number moves. Use it to see which number has the most effect on your result.

Understanding the result

The results are estimates. They use only the numbers you enter, so they can differ from what a bank, lender, or adviser calculates.

Monica Tulips ยท Updated: October 31, 2026

About the author

Monica Tulips

Monica Tulips

Finance Writer, Moni Calculator Pro

Monica Tulips writes the personal finance, savings, and loan guides on Moni Calculator Pro. Each calculator's math is covered by automated tests before its page is published, and the guides explain that math in plain language.

Frequently asked questions

Does this calculator look up historical stock prices?

No. You enter both share prices yourself. Use prices from a source you trust, and make sure they are adjusted for splits.

Why does the result leave out dividends?

The calculator uses share prices only, so it shows a price return. Dividends paid during the period would make the total return higher.

What does the average yearly return mean?

It is the steady yearly rate that would take your investment from the start value to the end value over the years you entered. Real prices move up and down, so the yearly figure smooths those changes out.

Can I use a date that is not a trading day?

Enter the price from the nearest trading day. Markets are closed on weekends and holidays, so use the closing price from the last trading day before or on your chosen date.

Are past returns a guide to the future?

Not reliably. Prices depend on many factors that change over time, so a strong past return does not mean a similar result is likely.