Energy Bill Savings Calculator

ANA›Life Services Authority›National Calculator Authority›Energy Bill Savings Calculator

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Energy Bill Savings Calculator

Estimate how much you can save on your energy bill by switching to more efficient appliances or reducing usage.

Current Appliance Power (Watts)

Efficient Appliance Power (Watts)

Hours Used Per Day

Days Used Per Year

Electricity Rate (¢ per kWh)

Number of Appliances

Calculate Savings

function eneCalc() { var resultDiv = document.getElementById('ene-result');

var currentWatts = parseFloat(document.getElementById('ene-current-watts').value); var efficientWatts = parseFloat(document.getElementById('ene-efficient-watts').value); var hoursPerDay = parseFloat(document.getElementById('ene-hours-per-day').value); var daysPerYear = parseFloat(document.getElementById('ene-days-per-year').value); var rateCents = parseFloat(document.getElementById('ene-rate').value); var numAppliances = parseFloat(document.getElementById('ene-num-appliances').value);

// Validation if (isNaN(currentWatts) || currentWatts Please enter a valid current appliance power (Watts).'; return; } if (isNaN(efficientWatts) || efficientWatts Please enter a valid efficient appliance power (Watts).'; return; } if (isNaN(hoursPerDay) || hoursPerDay 24) { resultDiv.innerHTML = 'Hours per day must be between 0.1 and 24.'; return; } if (isNaN(daysPerYear) || daysPerYear 365) { resultDiv.innerHTML = 'Days per year must be between 1 and 365.'; return; } if (isNaN(rateCents) || rateCents Please enter a valid electricity rate (¢/kWh).'; return; } if (isNaN(numAppliances) || numAppliances Number of appliances must be at least 1.'; return; } if (efficientWatts >= currentWatts) { resultDiv.innerHTML = '⚠️ The efficient appliance uses equal or more power than the current one — no savings achieved.'; return; }

var ratePerKwh = rateCents / 100; // convert cents to dollars

// Energy consumed per year (kWh) = (Watts / 1000) * hours/day * days/year * num_appliances var currentEnergyKwh = (currentWatts / 1000) * hoursPerDay * daysPerYear * numAppliances; var efficientEnergyKwh = (efficientWatts / 1000) * hoursPerDay * daysPerYear * numAppliances; var savedEnergyKwh = currentEnergyKwh - efficientEnergyKwh;

// Annual cost var currentAnnualCost = currentEnergyKwh * ratePerKwh; var efficientAnnualCost = efficientEnergyKwh * ratePerKwh; var annualSavings = savedEnergyKwh * ratePerKwh;

// Monthly savings var monthlySavings = annualSavings / 12;

// 5-year and 10-year savings var fiveYearSavings = annualSavings * 5; var tenYearSavings = annualSavings * 10;

// CO2 reduction: US average 0.386 kg CO2 per kWh (EPA 2023) var co2SavedKg = savedEnergyKwh * 0.386;

resultDiv.innerHTML = '### Your Energy Savings Estimate ' + '' + 'MetricCurrentEfficientSavings' + 'Annual Energy (kWh)' + currentEnergyKwh.toFixed(1) + '' + efficientEnergyKwh.toFixed(1) + '' + savedEnergyKwh.toFixed(1) + ' kWh' + 'Monthly Cost$' + (currentAnnualCost/12).toFixed(2) + '$' + (efficientAnnualCost/12).toFixed(2) + '$' + monthlySavings.toFixed(2) + '' + 'Annual Cost$' + currentAnnualCost.toFixed(2) + '$' + efficientAnnualCost.toFixed(2) + '$' + annualSavings.toFixed(2) + '' + '5-Year Savings$' + fiveYearSavings.toFixed(2) + '' + '10-Year Savings$' + tenYearSavings.toFixed(2) + '' + 'CO₂ Reduction / Year' + co2SavedKg.toFixed(1) + ' kg' + ''; }

#### Formulas Used

Annual Energy (kWh) = (Power in Watts ÷ 1,000) × Hours/Day × Days/Year × Number of Appliances

Annual Cost ($) = Annual Energy (kWh) × Electricity Rate ($/kWh)

Annual Savings ($) = Current Annual Cost − Efficient Annual Cost

Monthly Savings ($) = Annual Savings ÷ 12

N-Year Savings ($) = Annual Savings × N

CO₂ Reduction (kg/year) = Saved Energy (kWh) × 0.386 kg CO₂/kWh

#### Assumptions & References

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References

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