Electricity Cost Calculator

Enter appliance wattage and usage time to estimate your electricity bill. Calculate power consumption and monthly costs with this free online electricity cost calculator.

Check your KEPCO bill or KEPCO ON app

How to Use

  1. Enter appliance info

    Input the appliance wattage (W) and average daily usage hours.

  2. Set usage period

    Specify the number of usage days per month or the billing period.

  3. View results

    Click Calculate to see estimated energy consumption (kWh) and monthly electricity cost.

What Is Tiered Electricity Pricing?

Tiered electricity pricing is a residential rate structure in which the price per kWh climbs in steps as a household consumes more electricity. Usage is split into brackets, and each bracket is billed from the lowest rate upward, so the more you use, the higher the rate applied to that additional electricity.

Why It Matters

The moment your monthly usage crosses 200 kWh or 400 kWh, both the applicable unit rate and the base charge jump up a level. As a result, the same appliances can produce very different bills depending on whether you cross a bracket boundary. During summer and winter, when heating and cooling run heavily, entering the third bracket (above 401 kWh) can more than double the unit rate, so knowing which bracket your usage falls into makes it far easier to plan how to save.

Calculation Formula

The total bill is the base charge + usage charge, plus 10% VAT and a 3.7% power industry fund.

Usage charge = (200 kWh x 120) + (next 200 kWh x 214.6) + (excess x 307.3)

Total = (base charge + usage charge) x 1.137

Example: 350 kWh per month

  • Bracket 1: 200 kWh x 120 = 24,000
  • Bracket 2: 150 kWh x 214.6 = 32,190
  • Usage charge total = 56,190, base charge 1,600
  • Subtotal 57,790 + VAT 5,779 + fund 2,138 = about 65,707 KRW

To estimate from appliances, first find usage with monthly kWh = power (W) x hours per day x days / 1,000.

Frequently Asked Questions

What is the tiered electricity rate?
It is a structure where the unit price rises with consumption. For residential use it is split into Bracket 1 (0-200 kWh, 120/kWh), Bracket 2 (201-400 kWh, 214.6/kWh), and Bracket 3 (401 kWh and up, 307.3/kWh). The base charge also increases by bracket (910 to 1,600 to 7,300).
Is VAT included in the electricity bill?
Yes. A 10% value-added tax and a 3.7% power industry fund are added separately to the combined base and usage charges. This calculator adds both automatically and shows the final billed amount.
How do I check my monthly usage (kWh)?
You can read your current-month usage (kWh) directly from your utility app or your paper or email electricity bill. If you don't have a bill, you can also estimate it from each appliance's wattage and usage time.
Where do I find an appliance's wattage (W)?
The rated power consumption (W or kW) is printed on the label on the back or bottom of the appliance, or in its manual. Typical values are about 1,000W for an air conditioner, 150W for a refrigerator, and 1,200W for a microwave.
How do I estimate a monthly bill from appliances?
Use the formula: monthly usage (kWh) = power (W) x hours per day x days used / 1,000. For example, a 1,000W air conditioner run 8 hours a day for 30 days uses 240 kWh, entering Bracket 2.
Does standby power count toward the bill?
Yes. Standby power is consumed even when a device is off or idle, and it counts fully toward your usage. It is only 0.5-10W per device, but across several appliances running 24 hours a day it adds up to a meaningful monthly amount.
Does the bill jump sharply if I barely cross a bracket?
With tiered pricing the entire bracket does not become more expensive; only the kWh above the threshold are billed at the higher rate. That said, crossing 401 kWh into Bracket 3 raises the base charge to 7,300 and applies the 307.3/kWh rate, so the impact feels significant.
What are realistic ways to cut the electricity bill?
The most effective approach is to reduce the run time of high-draw appliances (air conditioner, rice cooker, dryer) to avoid moving into a higher bracket. Combining a standby-power-cutting power strip with high-efficiency Grade 1 appliances helps push your usage down a bracket.
Updated 2026 pricing

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