Average Cost Calculator — Free Online
Summarize purchase lots as total cost, total units and a quantity-weighted average. The worksheet combines prices without deciding a jurisdiction’s tax-basis or lot-selection method.
- Runs in your browser
- Nothing is uploaded
- No signup; device limits apply
Numbers stay on your device. Nothing is sent to a server.
One lot per line: shares, then price. Separate with space or comma.
How to use this tool
Enter quantity followed by unit price per line, separated by spaces or commas. There is no separate fee field; include a fee only by allocating it into the appropriate per-unit cost.
Results and examples
Two units at 10 and one at 16 cost 36 in total and average 12 per unit. Averaging the two prices alone would incorrectly give 13; monetary results display in USD.
Limitations
- Splits, distributions, sales and lot-specific tax records are not tracked automatically.
- An average is undefined if total quantity is zero.
Fields
| Field | Guidance and constraints |
|---|---|
| Lots (shares and price per line) | One lot per line: shares, then price. Separate with space or comma. |
Data handling
Processing stays in the current browser tab; the site does not upload tool input for the calculation itself.
Sources
Frequently asked questions
How does a two-unit lot affect the average?
Two units at 10 and one at 16 cost 36 in total and average 12 per unit. Averaging the two prices alone would incorrectly give 13; monetary results display in USD.
Where can fees be included?
Splits, distributions, sales and lot-specific tax records are not tracked automatically. An average is undefined if total quantity is zero.
Related tools
You do not need to start over. Continue with the tool that fits your next step.
