Horsepower to Watts Calculator: convert horsepower to watts instantly. Full formula, unit table, and worked example.
1 kilocalorie (kcal) = 4,184 J = 1.163 Wh = 3.968 BTU
1 kilowatt-hour (kWh) = 3,600,000 J = 3,412.14 BTU = 859.845 kcal
1 BTU = 1,055.06 J = 0.000293 kWh = 0.252 kcal
1 joule = 1 W·s = 0.000239 kcal = 0.000000278 kWh = 6.242×10¹⁸ eV
1 therm = 100,000 BTU = 29.307 kWh (US natural gas billing unit)