Averaging Stocks Calculator
Stock Average Calculator works out Average price per share and Total shares from Purchases, Total commission and fees and Current price (optional). The default figures on this page give average price per share of 166.6667 USD; change any entry and the result, the working and the sources update together.
Your figures
Updates as you typeHow this is worked out
4 steps
- Money spent: 10 x 100 + 20 x 200 = 5000.
- Shares: 10 + 20 = 30.
- Weighted average = 5000 / 30 = 166.666667.
- No commission, so break-even equals the average price.
Purchasestable
Its 5 worked examples are re-run on every release, last on 15 September 2026. What changed
Sources and references
2 sources
Keep this result
Save it, change one figure, then compare the two
The calculation stays free. Save this scenario, adjust one assumption, save that too, and put them side by side to see exactly what the change costs you. A free account keeps 5 scenarios and 2 comparisons; Personal makes both unlimited and adds exports and private links. Nothing is saved unless you press Save.
What the Stock Average Calculator calculates
The weighted average cost per share across several purchases: total money spent divided by total shares, so a larger purchase pulls the average further than a small one (10 at $100 plus 20 at $200 averages $166.67, not $150). Commission is added to the cost rather than the price, and the break-even price and any unrealised gain against a current price are reported alongside.
How to use this Stock Average Calculator
Enter Purchases, Total commission and fees and Current price (optional). Average price per share updates as you type, and “Use a worked example” loads checked figures you can adjust. Change one figure at a time to see what drives the result.
How the result is worked out
Open “How this is worked out” beside the result for the step-by-step calculation behind Average price per share, Total shares and Total cost.
The method follows IRS Publication 550, Investment Income and Expenses - cost basis of stock and CFA Institute, Quantitative Methods: weighted mean.
Ten at 100 and twenty at 200 example
With Purchases: 10 @ 100 20 @ 200, the calculator returns Average price per share: 166.666667, Total shares: 30, Total cost: 5000. This example is checked against an independent source in the test suite.
What you can compare
Change one input at a time to see how it affects Average price per share, Total shares and Total cost. The inputs you can vary are Purchases, Total commission and fees and Current price (optional).
Results are general information, not financial, tax, legal, medical or engineering advice. Check any decision that matters with a qualified professional.
See something wrong? Report a problem with this calculator
Frequently asked questions
What is the 7% rule in stocks?
On the figures this page opens with, the average price per share is 166.6667 USD. No single number fits everyone: it follows Purchases, Total commission and fees and Current price (optional), so enter your own above and the answer updates as you type.
How to do averaging in stocks calculator?
The weighted average cost per share across several purchases: total money spent divided by total shares, so a larger purchase pulls the average further than a small one (10 at $100 plus 20 at $200 averages $166.67. Open “How this is worked out” beside the result to see each step for your own figures.
What is the best stock average down calculator?
The weighted average cost per share across several purchases: total money spent divided by total shares, so a larger purchase pulls the average further than a small one (10 at $100 plus 20 at $200 averages $166.67. On this page it is computed from Purchases, Total commission and fees and Current price (optional) and shown as Average price per share, Total shares and Total cost.
How do you calculate the average stock?
It needs Purchases, Total commission and fees and Current price (optional). Nothing else is required, and the figures stay in your browser.
What information do I need for the Stock Average Calculator?
You need Purchases, Total commission and fees and Current price (optional). The page opens with default figures that give average price per share of 166.6667 USD, so you can see the scale before entering your own.
What does this Stock Average Calculator show?
It shows Average price per share, Total shares, Total cost, Break-even price including fees, Number of purchases, Value at the current price, Unrealised gain or loss and Purchases, with the working and any warnings for your entries.