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Convert length, area, volume, weight, power (kW ↔ BTU), energy, pressure and temperature in one place. Free, instant.
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1 kW is about 3,412 BTU/h — handy for air-con and boiler sizes.
Does it do feet and inches?Yes — metres to feet and inches and back, for plans and timber.
Is it accurate?Standard conversion factors; fine for site work and quotes.