Free Stock Investment Calculator - Calculate Your Returns
Calculate how many shares you can buy and estimate your investment returns
Formula & Methodology
This calculator helps you determine how many shares you can purchase with your available investment amount and calculates potential returns if you specify a sale price. It uses floor division to ensure you only count whole shares.
- Shares You Can Buy = floor(Amount to Invest ÷ Price Per Share)
- Total Buy Cost = Shares You Can Buy × Price Per Share
- Total Sale Value = Shares You Can Buy × Sale Price Per Share
- Profit/Loss = Total Sale Value - Total Buy Cost
- ROI (%) = (Profit/Loss ÷ Total Buy Cost) × 100
Worked Example
Using the Stock Investment Calculator: apply the formula above to your input values. For instance, Shares You Can Buy = floor(Amount to Invest ÷ Price Per Share), then Total Buy Cost = Shares You Can Buy × Price Per Share. The tool performs each step instantly and shows the result.
Frequently Asked Questions
How do I calculate my stock return?
Compare your total sale value plus dividends against your purchase cost to get the gain and percentage return.
Should I include dividends?
Yes. Reinvested dividends are a major part of long-term stock returns and can significantly change the total.
What return should I expect from stocks?
Historically broad markets have averaged high-single-digit annual returns, but individual stocks and short periods vary widely.