What is the Stock Average Calculator?
The stock average calculator is a free online tool that helps you work out stock average quickly and accurately. It uses the standard formula Average = sum(price x qty) / sum(qty) and shows the result instantly as you type, along with a full breakdown so you can see exactly how the answer was reached.
How to use this calculator
- Enter each buy price.
- Enter matching quantities.
- See your average cost.
Formula used
Average = sum(price x qty) / sum(qty)Explanation of each input
- Buy prices (comma separated) โ the buy prices (comma separated) used in the calculation.
- Quantities (comma separated) โ the quantities (comma separated) used in the calculation.
Understanding your result
- Average price โ the calculated average price.
- Total quantity โ the calculated total quantity.
- Total invested โ the calculated total invested.
Step-by-step calculation
For the example values 100x10, 120x5, 90x15:
- Apply the formula:
Average = sum(price x qty) / sum(qty) - Substitute the values: weighted average
- Result: avg about 98.33
Worked example
| Inputs | 100x10, 120x5, 90x15 |
|---|---|
| Working | weighted average |
| Result | avg about 98.33 |
Benefits and practical uses
This calculator saves you time and reduces errors when you need stock average. It is useful for students, professionals and anyone who wants a fast, reliable answer without manual calculation. Results update instantly, work in your browser and can be copied or shared in one click.
Assumptions and limitations
- Excludes brokerage and taxes.
Frequently asked questions
What is averaging down?
Buying more as the price falls to lower your average cost - it also raises your exposure.
Disclaimer: This calculator provides estimates for general information only and is not financial advice. Returns are illustrative and not guaranteed; consult a qualified financial adviser before making decisions.