Everyday Calculators

Electricity Bill Estimator

Estimate an electricity bill from the units (kWh) on your meter. Use a single flat rate, or enter your provider’s slabs, where each block of units is charged at its own rate.

Estimated bill$2,235.60

Energy charge: $1,950.00
Fixed charge: $120.00
Duty and taxes: $165.60
Average cost per unit: $6.99

Step-by-step working

Each block of units is charged at its slab rate; energy charge = $1,950.00
Add fixed charge $120.00 and 8% duty/tax $165.60 = $2,235.60

Tariffs, subsidies and fuel adjustment charges vary by provider and change over time; check your latest bill or your regulator’s tariff order for exact rates.

Slab breakdown

Units	Units charged	Rate	Amount
1 – 100	100	$4.50	$450.00
101 – 200	100	$6.00	$600.00
201 – above	120	$7.50	$900.00

How to use the Electricity Bill Estimator

Enter the units from your meter reading or bill.
Choose a flat rate or enter slabs. Leave the last slab’s limit blank.
Add fixed charges and the tax percentage.
Press Calculate.

Formula

Bill = energy charge + fixed charge + (energy + fixed) × tax%.

With slabs, units are filled into each block in order: e.g. the first 100 units at the first rate, the next 100 at the second, and so on.

Don’t know your units? Units (kWh) = watts × hours per day × days ÷ 1,000. A 1,500 W heater for 4 hours a day for 30 days uses 180 kWh.

Examples

320 units with slabs 0–100 @ 4.5, 101–200 @ 6, above @ 7.5: 450 + 600 + 900 = 1,950; + 120 fixed + 8% = 2,235.60.

Frequently asked questions

Why is my average cost per unit higher than the rate?

Fixed charges and taxes are spread over your units, and higher slabs cost more, so the average rises with use.