Electricity Bill Calculator (MEA / PEA)

Estimate your monthly Thai home electricity bill in seconds. Enter the units (kWh) you used, pick customer type 1.1 or 1.2, and adjust the Ft rate to match your bill. This tool applies Thailand's progressive residential energy rates tier by tier, adds the monthly service charge, the Ft (fuel adjustment) charge and 7% VAT, then shows your total alongside a detailed line-by-line breakdown and the average cost per unit. Everything runs in your browser — nothing is uploaded.

Electricity authority

Residential energy rates share one national structure; the selector is kept for clarity.

Customer type (residential)

Choose 1.1 if you normally use 150 units or less per month; otherwise choose 1.2, which has a higher service charge but different first-tier energy rates.

Units used (kWh) *

units

The number of electricity units used that month — read it from your meter or your bill.

Ft rate (fuel adjustment charge)

฿/unit

The Ft rate is revised each period by the ERC. The default is a recent example — edit it to match your bill.

Your estimated bill will appear here

Enter the units you used to estimate your monthly electricity bill.

Total bill

—

Energy charge

—

Ft charge

—

VAT 7%

—

Average cost per unit

—

The total bill (including VAT) divided by units used — a handy real cost-per-unit figure.

Itemised breakdown

Item	Amount

Estimate only. The Ft rate and service charge can change with ERC announcements, and this does not include discounts, penalties or other special line items. Always check against your actual bill.

How to use

Choose MEA (Bangkok metro) or PEA (provincial areas) as your authority.
Select customer type 1.1 (up to 150 units/month) or 1.2 (over 150 units/month).
Enter the units used (kWh) from your meter or your electricity bill.
Adjust the Ft rate per unit to match the latest announcement or your bill.
See the energy charge, service charge, Ft and 7% VAT with the total instantly.
Review the tier-by-tier table and average cost per unit, then copy the result.

Features

Full progressive tier calculation using Thailand's residential energy rates
Supports both type 1.1 and 1.2 with the correct monthly service charge for each
Editable Ft rate that accepts positive or negative values per ERC announcements
Line-by-line table with tiers, service charge, Ft, pre-VAT subtotal and 7% VAT
Average cost per unit so you can compare your real per-kWh price
100% in-browser — nothing is stored or sent off your device

Frequently asked questions

How is a Thai home electricity bill calculated?

Residential bills use a progressive tariff: the first units are cheaper and each higher tier costs more. After summing the energy charge across all tiers, you add the monthly service charge, then the Ft (fuel adjustment) charge, which is your units multiplied by the Ft rate per unit. That gives a pre-VAT subtotal, and 7% VAT is added on top to reach the total.

What is the difference between type 1.1 and 1.2?

Type 1.1 is for homes using up to 150 units per month; it has a 8.19 baht monthly service charge and finer price tiers in the low-usage range. Type 1.2 is for homes using more than 150 units per month; it has a 24.62 baht service charge and prices the first 150 units at a single rate. Pick the one that matches your usage.

What is the Ft rate and why do I edit it?

The Ft, or fuel adjustment charge, is the part of the tariff that moves with fuel costs and exchange rates. The Energy Regulatory Commission (ERC) announces a new rate each period, so the default here is only a recent example. Enter the Ft rate shown on your bill or in the current announcement for the most accurate estimate.

Do MEA and PEA charge different rates?

For residential customers, the energy rate structure and service charges follow one national standard, so this tool uses the same rates for both. The MEA/PEA selector is there for clarity about which service area you are in; it does not change your bill total.

Why does the result not exactly match my real bill?

This is an estimate. Your actual bill may include discounts, penalties, local taxes or special line items that are not included here, and the energy rates, service charge and Ft can change with ERC announcements. Always check against your real electricity bill.

Is my data sent anywhere?

No. All calculations happen entirely in your browser. The units and Ft rate you enter are never sent to a server or stored anywhere, and the tool is free to use with no sign-up.