EV Savings Calculator
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EV Savings Calculator
Calculate your potential savings by switching from a gasoline-powered car to an electric vehicle.
Annual Mileage (miles):
Gasoline Price per Gallon ($):
Gasoline Car MPG (miles per gallon):
EV Electricity Cost per kWh ($):
EV MPGe (miles per gallon equivalent):
Annual Maintenance Cost (Gasoline Car – $):
Annual Maintenance Cost (EV – $):
Calculate Savings
Estimated Annual Savings
—
Understanding EV Savings
Switching to an Electric Vehicle (EV) can offer significant financial benefits beyond just environmental impact. This calculator helps you estimate these savings by comparing the running costs of a gasoline-powered car to an EV.
How the Calculation Works
The calculator works by comparing the annual fuel and maintenance costs of your current gasoline car with those of a comparable EV. Here's a breakdown of the formulas:
1. Annual Fuel Cost (Gasoline Car):
This is calculated by first determining how many gallons of fuel are consumed annually and then multiplying by the price per gallon.
Gallons Used Annually = Annual Mileage / Gasoline Car MPG
Annual Fuel Cost (Gasoline) = Gallons Used Annually * Gasoline Price per Gallon
2. Annual Fuel Cost (EV):
For EVs, we use the concept of MPGe (Miles Per Gallon equivalent). This standard allows for a direct comparison of energy efficiency between electric and gasoline vehicles. We calculate the equivalent cost of electricity needed to travel the same annual mileage.
kWh Used Annually = (Annual Mileage / EV MPGe) * 33.7
Note: 33.7 kWh is the approximate energy content of one gallon of gasoline, used by the EPA for MPGe calculations.
Annual Fuel Cost (EV) = kWh Used Annually * EV Electricity Cost per kWh
3. Annual Maintenance Cost Difference:
EVs generally have lower maintenance costs due to fewer moving parts (no oil changes, fewer brake replacements due to regenerative braking). The difference is simply:
Maintenance Savings = Maintenance Cost (Gasoline Car) - Maintenance Cost (EV)
4. Total Annual Savings:
The total estimated annual savings is the sum of the fuel cost savings and the maintenance cost savings.
Total Annual Savings = (Annual Fuel Cost (Gasoline) - Annual Fuel Cost (EV)) + Maintenance Savings
Interpreting the Results
The calculator provides an estimated annual monetary saving. This figure represents the difference in direct operating costs. It does not include other potential benefits like tax credits, rebates, lower insurance premiums (though these can vary), or the environmental benefits of driving an EV.
Example Scenario
Let's consider an example:
Annual Mileage: 15,000 milesGasoline Price per Gallon: $3.75Gasoline Car MPG: 22 MPGEV Electricity Cost per kWh: $0.14EV MPGe: 105 MPGeAnnual Maintenance Cost (Gasoline): $600Annual Maintenance Cost (EV): $250
Gasoline Fuel Cost: (15,000 / 22) * $3.75 ≈ $2,557EV Fuel Cost: ((15,000 / 105) * 33.7) * $0.14 ≈ $718Maintenance Savings: $600 – $250 = $350Total Annual Savings: ($2,557 – $718) + $350 ≈ $1,839 + $350 = $2,189
In this example, switching to an EV could save approximately $2,189 per year in operating costs.
Factors to Consider
While this calculator provides a good estimate, remember to consider:
Actual driving habits (city vs. highway, aggressive acceleration).
Local electricity rates and gasoline prices, which can fluctuate.
Specific EV models and their efficiency ratings.
Potential government incentives and tax credits for EV purchases.
Home charging installation costs.
function calculateSavings() {
var annualMileage = parseFloat(document.getElementById("annualMileage").value);
var gasolinePricePerGallon = parseFloat(document.getElementById("gasolinePricePerGallon").value);
var gasolineMPG = parseFloat(document.getElementById("gasolineMPG").value);
var evCostPerkWh = parseFloat(document.getElementById("evCostPerkWh").value);
var evMPGe = parseFloat(document.getElementById("evMPGe").value);
var maintenanceCostGasolinePerYear = parseFloat(document.getElementById("maintenanceCostGasolinePerYear").value);
var maintenanceCostEVPerYear = parseFloat(document.getElementById("maintenanceCostEVPerYear").value);
var resultValueElement = document.getElementById("result-value");
var resultUnitElement = document.getElementById("result-unit");
// Clear previous results and styling
resultValueElement.innerText = "–";
resultUnitElement.innerText = "";
resultValueElement.style.color = "#28a745″; // Reset to success green
// Input validation
if (isNaN(annualMileage) || annualMileage <= 0 ||
isNaN(gasolinePricePerGallon) || gasolinePricePerGallon <= 0 ||
isNaN(gasolineMPG) || gasolineMPG <= 0 ||
isNaN(evCostPerkWh) || evCostPerkWh < 0 || // Electricity cost can theoretically be 0, but unlikely
isNaN(evMPGe) || evMPGe <= 0 ||
isNaN(maintenanceCostGasolinePerYear) || maintenanceCostGasolinePerYear < 0 ||
isNaN(maintenanceCostEVPerYear) || maintenanceCostEVPerYear < 0) {
resultValueElement.innerText = "Invalid Input";
resultValueElement.style.color = "#dc3545"; // Error red
return;
}
// Calculate annual fuel cost for gasoline car
var gallonsUsedAnnually = annualMileage / gasolineMPG;
var annualFuelCostGasoline = gallonsUsedAnnually * gasolinePricePerGallon;
// Calculate annual fuel cost for EV
// 33.7 kWh is the energy equivalent of one gallon of gasoline (used for MPGe standard)
var kwhUsedAnnually = (annualMileage / evMPGe) * 33.7;
var annualFuelCostEV = kwhUsedAnnually * evCostPerkWh;
// Calculate annual maintenance savings
var maintenanceSavings = maintenanceCostGasolinePerYear – maintenanceCostEVPerYear;
// Ensure maintenance savings isn't negative (user might enter higher EV maint.)
if (maintenanceSavings = 0) {
resultValueElement.innerText = totalAnnualSavings.toFixed(2);
resultUnitElement.innerText = " saved per year";
resultValueElement.style.color = "#28a745″; // Success Green
} else {
// Display the deficit if costs are higher for EV
resultValueElement.innerText = Math.abs(totalAnnualSavings).toFixed(2);
resultUnitElement.innerText = " higher cost per year for EV";
resultValueElement.style.color = "#ffc107"; // Warning Yellow/Orange
}
}