Business and Financial Tools
PEA Home Electricity Bill Calculator
Estimate your bill from consumption or meter readings, see each charge, and compare a lower-consumption plan.
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Understand your energy bill
What will your electricity cost?
See every bill component and compare a lower-consumption plan.
A clear breakdown
Your estimated bill
If you use less electricity
- Reduced consumption
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- New estimated bill
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- Monthly savings
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- 12 months, unchanged assumptions
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Uses the same tariff, fee, Ft and VAT. This is not a forecast of future bills.
How the base charge is calculated
1 unit = 1 kWh| Band (kWh) | kWh billed | THB/kWh | Base charge (THB) |
|---|
0–200 means consumption in the first 200 kWh. Base charges are summed before rounding to satang; the last row reconciles any rounding remainder.
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Quick answer
How is a PEA residential electricity bill calculated?
Estimated bill = progressive energy charge + Ft + service fee + VAT. Select tariff 1.1.1 or 1.1.2 from your PEA bill. Base rates start September 2026; default Ft is 16.23 satang/kWh for September–December 2026. Discounts and assistance are excluded.
How to use this tool
- Find PEA tariff 1.1.1 or 1.1.2 on your bill; do not infer it from one month of consumption.
- Enter kWh or previous and current readings, then enter a reduction no larger than consumption.
- Open settings to check Ft, service fee and VAT against your bill, then calculate.
- Review the breakdown and comparison. Export the latest result as Print, Excel, PDF or TXT.
How the calculation works
Consumption is entered directly or obtained by subtracting previous from current reading. Code applies the selected tariff bands, sums exact fixed-scale energy charges and rounds half-up to satang. The final table row reconciles any rounding remainder. Ft is kWh × satang/kWh ÷ 100. VAT applies to rounded energy, Ft and service fee using integer arithmetic. The lower-consumption scenario preserves the tariff, fee, Ft and VAT. Twelve-month savings equal the monthly difference multiplied by 12.
Examples
| Example | Input | Expected result |
|---|---|---|
| Tariff 1.1.2 with 300 kWh | |
Base charge THB 1,015.84; Ft 48.69; subtotal 1,102.75; VAT 77.19; estimated total THB 1,179.94. |
| Reduce consumption by 50 kWh | |
Reduced total THB 948.79; monthly savings 231.15; twelve-month savings THB 2,773.80 if assumptions remain unchanged. |
| Tariff 1.1.1 with 100 kWh | |
Base charge THB 290.11; Ft 16.23; VAT 22.02; estimated total THB 336.55. |
Limitations
- Covers PEA normal residential base rates effective September 2026, before assistance, free-electricity eligibility, discounts, arrears or payment fees. Excludes MEA, TOU and landlord billing.
- Default Ft is for September–December 2026. Editable service-fee defaults of THB 8.19/38.22 refer to the November 2018 PEA schedule and must be checked against your bill; that older schedule is not used for energy rates.
- Supports 0–1,000,000 kWh and meter readings from 0–1,000,000,000 with up to two decimals. Meter rollover and replacement are not supported.
- Ft accepts −100 to 100 satang/kWh; service fee accepts THB 0–1,000,000; VAT accepts 0–100%, all with up to two decimals. Ft and VAT use round-half-up to satang.
- Twelve-month savings hold consumption, tariff, fees and rates constant. They do not forecast energy prices or tariff reclassification.
Frequently asked questions
Should I switch to 1.1.1 when consumption falls below 150 kWh?
Select the tariff on your bill. Classification depends on PEA conditions and consumption history. The calculator does not determine eligibility or automatically change your tariff.
Is Ft 16.23 in baht or satang?
This input is satang/kWh. 16.23 satang equals THB 0.1623 per kWh. The default is for September–December 2026; check the correct period and update it from your bill.
Why might the result differ from my actual bill?
Relief, discounts, adjustments, rounding and the actual service fee can differ. This estimate is before assistance. Compare individual charges with your bill and contact PEA if needed.
Does this support MEA, TOU or landlord electricity rates?
This version covers only PEA normal residential tariffs 1.1.1 and 1.1.2. MEA, TOU and landlord billing are outside its scope.
Are meter readings sent or stored?
Calculations run in your browser without server submission, cookies or local storage. Reports include calculated consumption and exclude original meter readings.
References
- PEA — Residential base tariffs effective September 2026 Verified 2026-10-06
- ERC — Ft publications by billing period Verified 2026-10-06
- PEA — November 2018 schedule (service-fee reference; check your bill) Verified 2026-10-06
- Revenue Department — VAT decrees Verified 2026-10-06
Content and calculation method last reviewed: