J/kJ/cal/kcal/kWh/BTU/eV.
J: 3600000.0000 kJ: 3600.0000 cal: 860420.6501 kcal: 860.4207 kWh: 1.0000 BTU: 3412.1416 eV: 2.2469432668058746e+25
Yes.
No.
Celsius / Fahrenheit / Kelvin / Rankine.
B/KB/MB SI and IEC binary units.
Degrees, radians, gradians, turns.
km/L ↔ L/100km ↔ MPG.