.tesla-calculator-container {
font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, Helvetica, Arial, sans-serif;
max-width: 800px;
margin: 0 auto;
padding: 20px;
background: #f9f9f9;
border: 1px solid #e0e0e0;
border-radius: 8px;
}
.calc-header {
text-align: center;
margin-bottom: 30px;
}
.calc-header h2 {
color: #cc0000;
margin: 0;
font-size: 28px;
}
.calc-grid {
display: grid;
grid-template-columns: 1fr 1fr;
gap: 20px;
}
@media (max-width: 600px) {
.calc-grid {
grid-template-columns: 1fr;
}
}
.input-group {
margin-bottom: 15px;
}
.input-group label {
display: block;
margin-bottom: 5px;
font-weight: 600;
color: #333;
}
.input-group input, .input-group select {
width: 100%;
padding: 10px;
border: 1px solid #ccc;
border-radius: 4px;
font-size: 16px;
}
.input-group .unit {
font-size: 12px;
color: #666;
margin-top: 2px;
display: block;
}
.calc-btn {
background-color: #cc0000;
color: white;
border: none;
padding: 15px 30px;
font-size: 18px;
font-weight: bold;
border-radius: 4px;
cursor: pointer;
width: 100%;
margin-top: 20px;
transition: background 0.2s;
}
.calc-btn:hover {
background-color: #a30000;
}
.results-box {
background: white;
padding: 25px;
border-radius: 8px;
margin-top: 30px;
border-left: 5px solid #cc0000;
box-shadow: 0 2px 10px rgba(0,0,0,0.05);
display: none;
}
.result-row {
display: flex;
justify-content: space-between;
align-items: center;
padding: 10px 0;
border-bottom: 1px solid #eee;
}
.result-row:last-child {
border-bottom: none;
}
.result-label {
font-weight: 500;
color: #555;
}
.result-value {
font-weight: bold;
font-size: 18px;
color: #222;
}
.highlight-result {
font-size: 24px;
color: #cc0000;
}
.article-section {
margin-top: 40px;
line-height: 1.6;
color: #333;
}
.article-section h3 {
color: #222;
margin-top: 25px;
}
.article-section p {
margin-bottom: 15px;
}
.article-section ul {
margin-bottom: 15px;
padding-left: 20px;
}
.warning-text {
color: #e67e22;
font-size: 0.9em;
margin-top: 5px;
}
// Toggle custom battery input
document.getElementById('batterySize').onchange = function() {
var customInput = document.getElementById('customBattery');
if (this.value === 'custom') {
customInput.style.display = 'block';
customInput.value = ";
} else {
customInput.style.display = 'none';
customInput.value = this.value;
}
};
function calculateTeslaCharge() {
// 1. Retrieve Inputs
var batterySelect = document.getElementById('batterySize');
var batteryKWh = parseFloat(batterySelect.value === 'custom' ? document.getElementById('customBattery').value : batterySelect.value);
var currentSoC = parseFloat(document.getElementById('currentSoC').value);
var targetSoC = parseFloat(document.getElementById('targetSoC').value);
var voltage = parseFloat(document.getElementById('voltage').value);
var amperage = parseFloat(document.getElementById('amperage').value);
var efficiencyWhMi = parseFloat(document.getElementById('efficiency').value);
// 2. Validate Inputs
var errorDiv = document.getElementById('errorMsg');
var resultBox = document.getElementById('resultBox');
if (isNaN(batteryKWh) || isNaN(currentSoC) || isNaN(targetSoC) || isNaN(voltage) || isNaN(amperage) || isNaN(efficiencyWhMi)) {
resultBox.style.display = "block";
errorDiv.style.display = "block";
errorDiv.innerText = "Please fill in all fields with valid numbers.";
return;
}
if (currentSoC >= targetSoC) {
resultBox.style.display = "block";
errorDiv.style.display = "block";
errorDiv.innerText = "Target Charge must be higher than Current Charge.";
return;
}
errorDiv.style.display = "none";
resultBox.style.display = "block";
// 3. Calculation Logic
// Calculate Raw Power (kW) = Volts * Amps / 1000
var rawPowerKW = (voltage * amperage) / 1000;
// Apply Charger Efficiency (AC charging is typically ~90-95% efficient due to Onboard Charger conversion losses)
// We will use 90% as a conservative realistic estimate for home charging.
var chargerEfficiencyFactor = 0.90;
var effectivePowerKW = rawPowerKW * chargerEfficiencyFactor;
// Calculate Energy Needed (kWh)
var percentNeeded = targetSoC – currentSoC;
var energyNeededKWh = batteryKWh * (percentNeeded / 100);
// Calculate Time (Hours) = Energy Needed / Effective Power
// Avoid division by zero
var timeHours = 0;
if (effectivePowerKW > 0) {
timeHours = energyNeededKWh / effectivePowerKW;
}
// Convert Time to Hours and Minutes
var hours = Math.floor(timeHours);
var minutes = Math.round((timeHours – hours) * 60);
// Calculate Charging Speed (Miles added per hour)
// Speed = (Effective Power kW * 1000) / Wh per mile
var miles addedPerHour = 0;
if (efficiencyWhMi > 0) {
milesAddedPerHour = (effectivePowerKW * 1000) / efficiencyWhMi;
}
// 4. Update DOM
document.getElementById('resPower').innerText = rawPowerKW.toFixed(2) + " kW";
document.getElementById('resEnergy').innerText = energyNeededKWh.toFixed(1) + " kWh";
document.getElementById('resSpeed').innerText = Math.round(milesAddedPerHour) + " miles/hr";
var timeString = "";
if (timeHours > 24) {
timeString = "> 24 hours";
} else {
timeString = hours + " hr " + minutes + " min";
}
document.getElementById('resTime').innerText = timeString;
}
Tesla Charge Rate Calculator
Estimate charging time, power output, and range added per hour.
50 kWh (Standard Range)
60 kWh (Model 3/Y RWD)
75 kWh (Long Range Model 3/Y)
82 kWh (Performance Model 3)
100 kWh (Model S/X)
Custom
120V (Standard Outlet) | 240V (Dryer/Wall Connector)
12A (Low) | 32A (NEMA 14-50) | 48A (Wall Connector)
Lower = More Efficient (Model 3 ~240, Model X ~300)
Charger Output Power:
0 kW
Energy Needed:
0 kWh
Charging Speed:
0 miles/hr
Estimated Time to Charge:
0 hr 0 min
Understanding Tesla Charging Rates
Calculating how long it takes to charge a Tesla depends on physics: the capacity of the pipe (voltage and amperage) and the size of the bucket (battery capacity). This calculator uses standard electrical formulas to estimate your charging session for AC charging (Level 1 and Level 2).
Key Factors in the Calculation
- Voltage (V): This acts as the electrical pressure. Standard US wall outlets are 120V (Level 1), while dryer outlets and dedicated Wall Connectors are 240V (Level 2).
- Amperage (A): This is the volume of electricity flowing. A higher amperage means faster charging. A standard plug is usually 12A, while a Tesla Wall Connector can go up to 48A.
- Kilowatts (kW): The total charging power. Calculated as (Volts × Amps) / 1000. For example, 240V × 32A = 7.68 kW.
- Consumption (Wh/mi): Watt-hours per mile determines how many miles of range you gain per hour of charging. A Model 3 is very efficient (~240 Wh/mi), meaning it gains more range than a Model X (~300 Wh/mi) from the same charger.
Common Charging Scenarios
Level 1 (Mobile Connector): Plugged into a standard 120V outlet. This is "trickle charging," typically adding 3-5 miles of range per hour. Good for overnight top-ups if you don't drive much.
Level 2 (NEMA 14-50): Using a 240V outlet often found in RV parks or for dryers. At 32 Amps, this adds about 30 miles of range per hour, easily recharging a battery overnight.
Tesla Wall Connector: Hardwired 240V charging at up to 48 Amps. This is the fastest home charging method, adding up to 44 miles of range per hour depending on the vehicle model.