United States · USD. This page uses a shared calculation model and may include US-specific assumptions. Selecting a country changes formatting, not local tax, eligibility or contribution rules. Amounts are not converted between currencies.
Input Parameters
Results
Purchases Overview
- Shares
- Price
Choose a chart point to read its values.
View chart data table
Investment by Purchase
- Buy 1 @ $50$5,000 (45%)
- Buy 2 @ $40$2,000 (18%)
- Buy 3 @ $55$4,125 (37%)
Disclaimer: This calculator provides estimates for informational purposes only. Results are based on the inputs provided and standard financial formulas. Consult a qualified financial advisor before making financial decisions.
About This Calculator
The Stock Average Cost Calculator calculate your average cost basis across multiple purchases. It's built for anyone working with investing who wants fast, accurate numbers without building a spreadsheet.
Sources & Model Limits
United States · USD. This page uses a shared calculation model and may include US-specific assumptions. Selecting a country changes formatting, not local tax, eligibility or contribution rules. Amounts are not converted between currencies. Read our methods and correction policy.
How It Works
Enter your buy 1: shares, buy 1: price per share, buy 2: shares, buy 2: price per share, buy 3: shares, buy 3: price per share, and the calculator instantly computes your average cost basis, total shares, total cost. For example, with Buy 1: Shares: 100, Buy 1: Price Per Share: $50, Buy 2: Shares: 50, Buy 2: Price Per Share: $40, Buy 3: Shares: 75, Buy 3: Price Per Share: $55, the average cost basis comes out to $49.44.
Key Benefits
- 1See your average cost basis update instantly as you adjust any input
- 2Compare different scenarios side by side before making a decision
- 3Visualize the breakdown with a chart instead of raw numbers alone
- 4Export your results as a PDF report or CSV file for your records
Practical Tips
- →Time in the market beats timing the market — start as early as you can
- →Consistent contributions matter more than trying to predict short-term swings
- →Keep an eye on fees — expense ratios and trading costs compound against you too
- →Diversification reduces risk without necessarily reducing expected long-term return