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Electricity Bill Calculator (from Usage & Unit Price)

Enter your usage (kWh), per-kWh energy rate, fixed monthly base charge, and any renewable-energy levy to instantly estimate a monthly electricity bill. It also shows the breakdown of energy charge, base charge, and levy, plus the effective all-in unit price per kWh. Handy for checking an estimate against your meter reading.

Last updated:

Input

kWh
/kWh
$
/kWh

Result

Total electricity bill (usage 300 kWh)

$11,047.00

Base charge

$1,000.00

Energy charge

$9,000.00

Renewable levy

$1,047.00

Effective unit price

36.82 /kWh

How it works

  • Total bill = base charge + usage (kWh) × energy unit price + usage (kWh) × renewable-energy levy per kWh. This is the most common simple estimate.
  • The energy unit price is the per-kWh charge for consumption. Real tariffs often use tiered (stepped) rates that change with usage, so enter the rate that applies to you. This tool estimates with a single rate.
  • The renewable-energy levy is a per-kWh surcharge that is revised periodically. Enter 0 if you do not want to include it.
  • The effective unit price is total ÷ usage — the per-kWh amount you actually pay including the base charge.
  • The total is rounded down to the nearest unit for display. Fuel-cost adjustments, discounts, and tax handling vary by provider and plan and are not included here.
  • Results are approximate estimates. Check your provider's tariff sheet and meter reading for the exact billed amount.

Frequently asked questions

What formula does it use to calculate the bill?
It uses the common estimate: base charge + usage (kWh) × energy rate + usage (kWh) × renewable-energy levy rate. The total is displayed rounded down to the nearest yen.
How do I handle tiered (stepped) unit prices?
This tool estimates with a single unit price. Real rate tables often use tiered pricing where the rate changes with usage, so enter the unit price for the applicable tier as the energy rate.
What is the effective unit price, and does it include fuel-cost adjustments?
The effective unit price is total ÷ usage, showing the all-in cost per kWh including the base charge. Fuel-cost adjustments, discounts, and consumption tax vary by provider and plan and are not included here.

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