Stock Average Calculator
Work out your weighted average cost per share across several purchases, and see the unrealised profit or loss at today's price.
Every figure below is labelled in the currency you pick. Amounts are not converted — enter values in the same currency.
Averaging down is not automatically a good idea
Buying more of a falling holding lowers your average cost, which makes the position look better on a screen. It does not make the company better. The only question that matters is whether you would buy the stock today at this price with fresh money — if the answer is no, lowering your average is just concentrating a mistake.
How to use the Stock Average Calculator
- Fill in each field with your own figures — the defaults are only there as an example.
- The result updates as you type, so there is no button to press.
- Check the breakdown under the main result for the supporting numbers.
- Use the copy button to take the result with you, or share the link to reload the same inputs.
Stock Average Calculator — frequently asked questions
Is this stock average calculator free to use?
Yes. Every calculator on the site is free, needs no sign-up, and runs entirely in your browser, so your figures never leave your device.
How accurate is the result?
The maths is exact for the formula shown on the page. Accuracy in the real world depends on your inputs and on assumptions the formula cannot see, so treat the output as a well-grounded estimate rather than a quote.
Can I use it on my phone?
Yes. The page is responsive, weighs a few kilobytes and works offline once loaded, so it behaves the same on a phone as on a desktop.
What people search for
This page answers each of these searches. They are the exact phrases visitors use to find the stock average calculator.
- stock average calculator
- average down calculator
About this calculator
Written and reviewed by The Samsung Calculator editorial team. Every calculator is written against a published formula, reviewed against at least one independent reference implementation, and dated when it changes.
Last reviewed August 15, 2026 · Calculation runs client-side · No data collected · Report an error