Who runs StockAvg
StockAvg is an independent, self-funded website. It is not a broker, not a bank, not an investment adviser and not affiliated with any exchange or brokerage. The site is published under the StockAvg name, and that is the only name on it: there is no personal byline here, and none is needed to use a calculator.
StockAvg is one person's project rather than a company's product, which is also why the site stays small on purpose. The first calculator went up in September 2026 and the rest were added one page at a time, each one built for a single question.
What this site does
It runs sixteen calculators. Each one takes numbers you already have and answers one question with them: your average cost per share (stock average); what one more buy would do to that average (average down); what those same buys cost you in total and per share (cost basis); what a run of regular buys came to (DCA); what your dividends pay you (dividend), what they pay you a month (monthly dividend), how fast they have been growing (dividend growth) and what reinvesting them does over a run of years (DRIP); what a position made or lost once both commissions are in (profit) and what is left of it after tax at a rate you name (capital gains); what a split does to your share count and your cost (split); how large a position a given risk allows (position size); what a company is worth at a share price you name (market cap); what an option contract is worth at expiration (options profit); the compound annual growth rate between two dates (CAGR); and what a certificate of deposit pays over its term (CD).
Every one of them works the same way: you type the figures in, the page does the arithmetic in your own browser and prints the steps it took, with your numbers in the working, so you can check the answer instead of taking it on trust. Where a figure has to be cut short, it is cut downwards rather than rounded up, and the page says so.
The arithmetic is never hidden. A weighted average shows the sum it was divided from; a growth rate shows the dates and the day count behind the years; a dividend table shows each year's payout on its own line rather than one blended figure. That is the whole design: a reader should be able to follow the sum to the answer, not be handed the answer alone.
What this site deliberately does not do
- No live prices. Every price on this site is typed in by you. No page fetches a quote, so no page here can show you a price that isn't real.
- No accounts, no saving, no history. Reload the page and your numbers are gone. That is by design: there is no database behind this site.
- No advice. These pages return arithmetic, not recommendations. A lower average cost does not make a position safer, and none of them will tell you what to buy.
- No tax table and no bracket. One page here — capital gains — does return a tax figure, but only from a rate you type into it. No page keeps a tax table, picks a bracket, asks how long the shares were held or turns a holding period into a rate of its own. Leave the rate box empty and the tax line stays empty rather than filling itself in.
- No commission field except where the fee belongs to the sum. Two pages have one: profit takes a commission on the buy and another on the sale, and capital gains takes the same two, because neither answer is right without them. Every other page has nowhere to type one, and on those the usual way to fold a commission in by hand is to divide it by the shares in that purchase and add the result to the price per share before you enter the row.
- No currency conversion. Amounts come back in whatever currency you typed, and no exchange rate is applied anywhere, so keep one currency per run.
- No broker connection and no imports. Nothing here links to a brokerage account, reads a statement or takes a file. Two pages that would otherwise invite it say so outright: the market cap page cannot import a holdings list, and the options page cannot import a list of trades.
Splits and dividends are not left out of the site — they have pages of their own, listed above. What is true is narrower: the average-cost and cost-basis pages do not adjust for them, and each says so on the page. If a split has already happened to the position you are costing out, the split page works out the new share count and the new cost, and you enter the rows as your holding stands now.
How this site is paid for
StockAvg is free, has no paid tier and sells nothing. The intention is to keep it free by placing advertising on the pages. No ad is running at the time this page was last updated; when that changes, the privacy page names the advertising provider, links to its own policy and says what its script does.
How your numbers are handled
Every calculation happens in your own browser, on your own device. The numbers you type are not uploaded, not sent to a server and not stored anywhere. See the privacy page for the full picture, including what may change on this site later.
Get in touch
If something on the site is wrong, unclear or broken, the contact page has the address to write to. Corrections are welcome — a calculator that gives a wrong answer is worse than no calculator.