kWh to BTU Converter

Multiply the kilowatt-hours by 3,412.14. For example, 5 kWh x 3,412.14 = 17,060.71 BTU. The exact factor is 3,412.141633, which comes from 1 kWh = 3,600,000 joules divided by 1 BTU = 1,055.05585262 joules. To go the other way, divide the BTU by the same factor.

Both units measure energy, just on different scales. One kilowatt-hour is 1,000 watts running for one hour, which equals 3,600,000 joules. One BTU (International Table) is defined as 1,055.05585262 joules. Dividing 3,600,000 by 1,055.05585262 gives 3,412.14, so that many BTU fit inside a single kWh.

It uses the International Table BTU (BTU-IT), 1,055.05585262 joules, which is the standard for HVAC equipment ratings and US energy billing. A few other BTU definitions exist (thermochemical, 39 F, 59 F, 60 F), but they differ by only a fraction of a percent and are rarely used outside specialized engineering.

One US therm is exactly 100,000 BTU, so one therm equals about 29.31 kWh, and one kWh equals about 0.034121 therms. Gas utilities usually bill in therms or hundred cubic feet (CCF), while electricity is billed in kWh, so converting through BTU lets you compare heating costs across fuels on the same scale.

Heating and cooling equipment is rated in BTU or BTU per hour, while electricity use is metered in kWh. Converting lets you compare a heat pump's electric draw against a furnace's BTU output, size a backup heater, or estimate how many kWh a given BTU heating load needs. Multiply the BTU/hr by the run time in hours, then divide by 3,412.14 to get kWh.

Yes. You can enter any non-negative number, including fractions like 0.5 kWh or large figures like 25,000 BTU. Negative values are rejected because energy quantities cannot be below zero. Results show kWh and therms to six decimals and BTU to two decimals so small conversions stay precise.