Original Principal Value Calculator Use this calculator to determine the original base value (principal) of an amount before a percentage adjustment was applied. This is useful for finding an initial price before a discount or markup, or an original quantity…

ROI Calculator Total Revenue from Investment ($): Total Cost of Investment ($): Calculate ROI function calculateROI() { var totalRevenue = parseFloat(document.getElementById(‘totalRevenue’).value); var totalCost = parseFloat(document.getElementById(‘totalCost’).value); var roiResultDiv = document.getElementById(‘roiResult’); if (isNaN(totalRevenue) || isNaN(totalCost)) { roiResultDiv.innerHTML = “Please enter valid numbers…

Z-Score Probability Calculator Specific Value (X): Population Mean (μ): Population Standard Deviation (σ): Calculate Probability function normalCDF(z) { // This is an approximation for the cumulative distribution function (CDF) of the standard normal distribution. // It’s based on the Abramowitz…

Parallel Resistor Calculator Resistor 1 (Ohms): Resistor 2 (Ohms): Resistor 3 (Ohms): Resistor 4 (Ohms) (Optional): Resistor 5 (Ohms) (Optional): Calculate Equivalent Resistance Equivalent Resistance: — Ohms function calculateParallelResistance() { var resistors = []; var r1 = parseFloat(document.getElementById(“resistor1”).value); var r2…

Proportion Calculator Use this calculator to find the missing value (X) in a proportion, where A is to B as C is to X (A/B = C/X). First Value (A): Second Value (B): Third Value (C): Calculate X Understanding Proportions…

Resting Heart Rate Calculator Number of Beats Counted: Time Period (seconds): Calculate Resting Heart Rate Your Resting Heart Rate will appear here. function calculateRHR() { var beatsCounted = parseFloat(document.getElementById(‘beatsCounted’).value); var timePeriod = parseFloat(document.getElementById(‘timePeriod’).value); var resultDiv = document.getElementById(‘rhrResult’); if (isNaN(beatsCounted) ||…

LED Resistor Calculator Supply Voltage (V): LED Forward Voltage (Vf): LED Forward Current (mA): Calculate Resistor Calculation Results: Required Resistor Value: — Resistor Power Dissipation: — function calculateLedResistor() { var supplyVoltage = parseFloat(document.getElementById(‘supplyVoltage’).value); var ledForwardVoltage = parseFloat(document.getElementById(‘ledForwardVoltage’).value); var ledForwardCurrent_mA =…

Rate of Return on Investment Calculator Initial Investment Amount ($): Final Investment Value ($): Investment Period (Years): Calculate Rate of Return Results: Simple Rate of Return: Annualized Rate of Return: function calculateROR() { var initialInvestment = parseFloat(document.getElementById(‘initialInvestment’).value); var finalValue =…

Rectangle Perimeter Calculator Length: Width: Calculate Perimeter function calculatePerimeter() { var lengthInput = document.getElementById(“rectangleLength”).value; var widthInput = document.getElementById(“rectangleWidth”).value; var resultDiv = document.getElementById(“perimeterResult”); var length = parseFloat(lengthInput); var width = parseFloat(widthInput); if (isNaN(length) || isNaN(width) || length <= 0 || width…

Process Capability Index (Cp & Cpk) Calculator Upper Specification Limit (USL): Lower Specification Limit (LSL): Process Mean (μ): Process Standard Deviation (σ): Calculate Cp & Cpk Results: Enter values and click “Calculate” to see the Process Capability Index (Cp) and…