ConverterHub

Therms to kWh Converter

Enter an energy amount and pick a direction to convert.

Result

1,318.50 kWh
29.300111 kWh/therm
45.0000 therms

How it is calculated

The tool converts with one fixed factor, 1 therm = 29.3001111 kWh. In the therms-to-kWh direction it computes kWh = therms × 29.3001111; in the kWh-to-therms direction it computes therms = kWh ÷ 29.3001111. Besides the main answer, it shows the conversion rate used (kWh/therm or therms/kWh, six decimals) and a back-conversion of the result, which acts as a check. Kilowatt-hours are shown to 2 decimals and therms to 4. Negative values give no result. The factor treats a therm as exactly 100,000 BTU. This is an energy conversion only: it does not convert gas volume (cubic metres or cubic feet) into energy, which needs the calorific value printed on your gas bill.

Worked example

A household used 45 therms of natural gas in a month, and you want the figure in kWh to compare with an electricity bill. Using the therms-to-kWh direction: 45 × 29.3001111 = 1,318.50 kWh. The tool also shows the rate, 29.300111 kWh/therm, and the reverse check 1,318.50 ÷ 29.3001111 = 45.0000 therms. Going the other way, 1,000 kWh would be about 34.13 therms, since 1 ÷ 29.3001111 = 0.034130.

Try this example →

Common mistakes

  • Choosing the wrong direction. Entering 45 with kWh-to-therms selected gives 1.5358 therms; the direction setting decides which unit you are typing in.
  • Entering gas volume (m³ or ccf) as if it were therms. The tool converts energy only, so a volume must first be turned into energy using the calorific value from your bill.
  • Comparing gas and electricity prices without accounting for efficiency. 1 kWh of gas energy is not 1 kWh of heat delivered if the boiler wastes part of it.
  • Mixing therm definitions. This tool uses the 100,000 BTU therm; a bill that uses a different local energy value or a rounded factor will differ slightly.
  • Rounding the factor to 29.3 and then multiplying by large amounts. Over several thousand therms the small difference shows up in the last digits.

About this calculator

A therm (100,000 BTU) is a common billing unit for natural gas in the US and UK, while the kilowatt-hour (kWh) is the standard energy unit for electricity — and increasingly for gas billing in parts of Europe too. The conversion factor is 1 therm = 29.3001111 kWh.

Converting between the two lets households and businesses compare gas and electricity costs on the same energy basis, or reconcile bills issued in different units when moving between regions or providers. This converter is used by homeowners comparing heating fuel costs, energy brokers, and anyone auditing utility bills that mix therms and kWh.

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