Stock Average Calculator
Find weighted average cost basis across multiple stock purchases.
Enter Your Numbers
Average Cost = Total Cost / Total Shares
Stock Average Calculator Guide
Use this stock average calculator to quickly work out find weighted average cost basis across multiple stock purchases. Enter your numbers above and get instant results along with a year-by-year breakdown so you can see exactly how the numbers change over time.
The formula used is Average Cost = Total Cost / Total Shares. Run a few different scenarios by changing one input at a time to see how each variable affects the outcome.
How to Use This Stock Average
Enter your values in the form above and click Calculate. The results section shows the most important numbers first. Below that, the year-by-year table lets you see how the balance changes over the full term. Change one field at a time to compare different scenarios side by side.
When to Use a Stock Average
This calculator is useful when you need to estimate find weighted average cost basis across multiple stock purchases. It works for both quick estimates and detailed planning. For best results, use realistic numbers based on your actual financial situation rather than optimistic guesses. Check the results table to understand the long-term trajectory, not just the final number.