This calculator helps you determine the potential profit or loss from an investment in Tesla stock (TSLA). It considers the price at which you bought the shares, the number of shares you own, the current market price, and any commission fees associated with buying and selling.
How it Works:
The calculation involves several steps to provide an accurate outcome:
Total Purchase Cost: This is calculated by multiplying the Purchase Price per Share by the Number of Shares, and then adding the Commission Fee for the purchase. If there's a selling commission, it's subtracted later.
Total Current Value: This is determined by multiplying the Current Market Price per Share by the Number of Shares.
Gross Profit/Loss: This is the difference between the Total Current Value and the Total Purchase Cost (before considering selling commissions).
Net Profit/Loss: To get the final net result, we subtract any commission fees associated with selling the stock from the Gross Profit/Loss. In this calculator, we assume a single commission fee applies to both purchase and sale for simplicity, or if not specified for sale, it's deducted once. If you pay commission on both buying and selling, you'd typically double the commission fee.
The Formula:
Let:
$PP$ = Purchase Price per Share
$N$ = Number of Shares
$CP$ = Current Market Price per Share
$C$ = Commission Fee (per trade)
Total Purchase Cost = ($PP \times N$) + $C$
Total Current Value = $CP \times N$
Gross Profit/Loss = Total Current Value – Total Purchase Cost
Net Profit/Loss = Gross Profit/Loss – $C$ (assuming commission applies to sale as well)
If you only consider the commission for the purchase, the formula for Net Profit/Loss would simply be the Gross Profit/Loss. This calculator deducts the commission fee once, representing either a round-trip fee or a single trade fee. For precise accounting, you might need to adjust for separate buy/sell commissions.
Use Cases:
This calculator is useful for:
Estimating the potential profitability of buying Tesla stock.
Understanding the impact of current market price fluctuations on your investment.
Quickly assessing the outcome of a trade, including fees.
Making informed decisions about when to buy or sell TSLA shares.
Disclaimer: This calculator is for educational and informational purposes only and does not constitute financial advice. Stock market investments are subject to risk, and past performance is not indicative of future results. Always consult with a qualified financial advisor before making investment decisions.
function calculateProfitLoss() {
var purchasePrice = parseFloat(document.getElementById("purchasePrice").value);
var numberOfShares = parseInt(document.getElementById("numberOfShares").value);
var currentPrice = parseFloat(document.getElementById("currentPrice").value);
var commissionFee = parseFloat(document.getElementById("commissionFee").value);
var profitLossResultElement = document.getElementById("profitLossResult");
var resultMessageElement = document.getElementById("resultMessage");
// Input validation
if (isNaN(purchasePrice) || isNaN(numberOfShares) || isNaN(currentPrice) || isNaN(commissionFee)) {
resultMessageElement.textContent = "Please enter valid numbers for all fields.";
profitLossResultElement.textContent = "–";
profitLossResultElement.className = "metric neutral";
return;
}
if (purchasePrice <= 0 || numberOfShares <= 0 || currentPrice < 0 || commissionFee 0) {
className = "metric positive";
message = "Congratulations! You have a profit.";
} else if (netProfitLoss < 0) {
className = "metric negative";
message = "You have a loss.";
} else {
message = "Your investment is at break-even.";
}
profitLossResultElement.textContent = "$" + formattedNetProfitLoss;
profitLossResultElement.className = className;
resultMessageElement.textContent = message;
}