Calculate your estimated utility bill based on consumption and rates.
Calculation Summary
Total Units Consumed:0 kWh
Consumption Cost:0.00
Total Standing Charge:0.00
Tax/VAT Amount:0.00
Estimated Total Bill:0.00
How to Use the Tariff Calculator
Understanding your energy bill can be complex. This tariff calculator helps you break down the costs associated with your electricity or gas consumption. Most utility providers use a two-part pricing structure: the variable unit rate and the fixed standing charge.
Key Components of a Tariff
Unit Rate: This is the price you pay for every kilowatt-hour (kWh) of energy you use. If you use more appliances, this part of your bill increases.
Standing Charge: This is a fixed daily fee that covers the cost of maintaining the energy network and supplying your home, regardless of how much energy you use.
kWh (Kilowatt-hour): The standard unit of energy measurement. One kWh is roughly enough to power a modern fridge for a full day or run an electric oven for 30 minutes.
Calculation Example
Suppose your previous meter reading was 10,000 kWh and your current reading is 10,500 kWh. You have used 500 kWh. If your unit rate is 0.30 and your standing charge is 0.50 per day for a 30-day month:
Consumption Cost: 500 kWh × 0.30 = 150.00
Standing Charge: 30 days × 0.50 = 15.00
Subtotal: 150.00 + 15.00 = 165.00
Total (with 5% VAT): 165.00 × 1.05 = 173.25
Tips for Reducing Your Bill
If your calculated results are higher than expected, consider looking for "Time of Use" tariffs which offer cheaper rates during off-peak hours (like night-time). Additionally, ensuring your home is well-insulated can significantly reduce the kWh required to maintain a comfortable temperature.
function calculateTariff() {
var prev = parseFloat(document.getElementById('prevReading').value);
var current = parseFloat(document.getElementById('currentReading').value);
var rate = parseFloat(document.getElementById('unitRate').value);
var standing = parseFloat(document.getElementById('standingCharge').value);
var days = parseFloat(document.getElementById('billingDays').value);
var tax = parseFloat(document.getElementById('taxRate').value);
if (isNaN(prev) || isNaN(current) || isNaN(rate) || isNaN(standing) || isNaN(days)) {
alert("Please enter valid numerical values in all required fields.");
return;
}
if (current < prev) {
alert("Current reading cannot be lower than previous reading.");
return;
}
var unitsUsed = current – prev;
var energyCost = unitsUsed * rate;
var standingTotal = standing * days;
var subtotal = energyCost + standingTotal;
var taxAmount = subtotal * (tax / 100);
var finalTotal = subtotal + taxAmount;
document.getElementById('resUnits').innerText = unitsUsed.toLocaleString() + " kWh";
document.getElementById('resEnergyCost').innerText = energyCost.toFixed(2);
document.getElementById('resStandingCost').innerText = standingTotal.toFixed(2);
document.getElementById('resTax').innerText = taxAmount.toFixed(2);
document.getElementById('resTotal').innerText = finalTotal.toFixed(2);
document.getElementById('tariffResult').style.display = 'block';
}