Percentage Return on Investment (ROI) Calculator Initial Investment ($): Current Value or Revenue ($): Calculate ROI function calculateROI() { var initialInvestment = parseFloat(document.getElementById(‘initialInvestment’).value); var currentValue = parseFloat(document.getElementById(‘currentValue’).value); var roiResultDiv = document.getElementById(‘roiResult’); if (isNaN(initialInvestment) || isNaN(currentValue)) { roiResultDiv.innerHTML = “Please enter…

Pupillary Distance (PD) Calculator Known Object Width (mm): e.g., 85.6 for a standard credit card. Known Object Width (pixels in photo): Measure the object’s width in pixels from your photo. Pupil Distance (pixels in photo): Measure the distance between the…

Cost of Living Index Comparison Calculator Your Current Annual Salary ($): Current City’s Cost of Living Index (e.g., 100 for national average): Target City’s Cost of Living Index (e.g., 130 for expensive, 80 for cheaper): Calculate Equivalent Salary Calculation Results:…

Black-Scholes Options Price Calculator Current Stock Price ($): Option Strike Price ($): Time to Expiration (Years): Risk-Free Rate (Annual %): Volatility (Annual %): Option Type: Call Option Put Option Calculate Option Price Enter values and click ‘Calculate’ to see the…

Combinations and Permutations Calculator Total Number of Items (n): Number of Items to Choose (k): Calculate Options Results: Number of Permutations (Order Matters): Number of Combinations (Order Doesn’t Matter): function factorial(num) { if (num 1; i–) { result *= i;…

Percentage Return Calculator Initial Value: Current Value: Calculate Percentage Return function calculatePercentageReturn() { var initialValueInput = document.getElementById(“initialValue”).value; var currentValueInput = document.getElementById(“currentValue”).value; var resultDiv = document.getElementById(“result”); var initialValue = parseFloat(initialValueInput); var currentValue = parseFloat(currentValueInput); if (isNaN(initialValue) || isNaN(currentValue)) { resultDiv.innerHTML =…

Cost of Living Index Comparison Calculator Your Current Annual Salary ($): Current City’s Cost of Living Index (e.g., 100 for national average): Target City’s Cost of Living Index (e.g., 130 for expensive, 80 for cheaper): Calculate Equivalent Salary Calculation Results:…

Hourly Pay Rate Calculator Use this calculator to determine your hourly pay rate based on your total gross earnings and the number of hours you worked during a specific period. Total Gross Pay ($): Total Hours Worked: Calculate Hourly Rate…

Percentage of Weight Loss Calculator Starting Weight (e.g., lbs or kg): Current Weight (e.g., lbs or kg): Calculate Percentage Loss function calculateWeightLossPercentage() { var startingWeight = parseFloat(document.getElementById(‘startingWeight’).value); var currentWeight = parseFloat(document.getElementById(‘currentWeight’).value); var resultDiv = document.getElementById(‘result’); if (isNaN(startingWeight) || isNaN(currentWeight) ||…

Gross Pay Calculator Hourly Rate ($): Regular Hours Worked: Overtime Hours Worked: Overtime Multiplier (e.g., 1.5 for time and a half): Calculate Gross Pay Enter your details and click ‘Calculate’ to see your pay. function calculateGrossPay() { var hourlyRate =…