Understanding Energy Units on Your Bill
Whether you are reading an electricity bill or comparing AC cooling capacity, energy shows up in different units. This independent MEPCODBill converter translates between them. For bill estimates use the bill calculator; for official invoices use reference-number lookup.
How the Converter Works
- Enter an amount.
- Choose the “from” and “to” units.
- The tool multiplies by fixed conversion factors (kWh ↔ Wh ↔ J ↔ BTU ↔ kcal).
The Kilowatt-Hour (kWh) / The "Unit"
On South Punjab electricity bills, 1 unit ≈ 1 kilowatt-hour (kWh): running 1,000 W for one hour. Confirm tariff rupees-per-unit against NEPRA schedules — this page only converts energy quantities, not money.
- 1 kWh = 1,000 Watt-hours
- 1 kWh = 3.6 Million Joules
- 1 kWh = 3,412 BTUs
British Thermal Unit (BTU)
In Pakistan, we rate Air Conditioners in "Tons", but the global standard is BTUs. A BTU measures the amount of energy required to raise the temperature of one pound of water by one degree Fahrenheit.
| AC Tonnage | BTU/hr Rating |
|---|---|
| 1.0 Ton | 12,000 BTU |
| 1.5 Ton | 18,000 BTU |
| 2.0 Ton | 24,000 BTU |
Joules (J)
The Joule is the standard SI unit of energy used in physics and engineering. It is defined as the work done by a force of one newton acting through one meter. Because it is a very small unit of energy, Kilojoules (kJ) or Megajoules (MJ) are more commonly used in practical applications.
When Results Differ from Marketing Specs
AC “tonnage” and BTU/hr are cooling-capacity conventions; they are not the same as electrical kWh on your bill. Convert carefully and still read the appliance electrical wattage for cost estimates.
How this estimate works
Core logic
Fixed conversion factors: 1 kWh = 1000 Wh = 3.6×10⁶ J ≈ 3412 BTU (and related kcal factors)
Assumptions
- Standard SI / common engineering conversion constants
- “1 unit” on South Punjab bills is treated as 1 kWh for quantity conversion only
- No money conversion — tariff rupees-per-unit are out of scope here
Limitations
- AC tonnage / BTU/hr are cooling-capacity conventions, not electrical kWh on your bill
- Does not apply NEPRA tariffs or produce an official bill total
- Marketing specs can differ from label electrical wattage used for cost estimates
This calculator runs entirely in your browser. Inputs are not uploaded to our servers.
Sources & verification
Official sources sit above third-party summaries. Open these pages to confirm the current figure or process.
- NEPRA Tariff SchedulesWhen you move from kWh quantity to rupee cost estimates
Frequently Asked Questions (FAQs)
How many BTUs are in 1 Ton of AC?▼
In the HVAC industry, 1 Ton of cooling capacity is equal to 12,000 BTUs per hour. This means a 1.5 Ton AC operates at 18,000 BTUs per hour.
Is 1 kWh the same as 1 Unit of electricity?▼
Yes. In Pakistan and many other parts of the world, when utility companies like MEPCO bill you for "units" of electricity, they are directly referring to Kilowatt-hours (kWh).
What is the difference between kW and kWh?▼
Kilowatt (kW) is a measure of power, which is the *rate* at which energy is used. Kilowatt-hour (kWh) is a measure of *total energy* used over time. If a 1 kW appliance runs for 1 hour, it consumes 1 kWh of energy.