IMPORTANT! If you don't see menu at left, CLICK HERE, then CLICK 'Energy' button.

Energy or work [force length] Input: Btu (IT) Btu (th) Btu (mean) calories (IT) calories (th) calories (mean) calories (15C) calories (20C) calories (food) centigrade heat units ergs foot pounds-force foot poundals gigajoules [GJ] horsepower hours joules [J] kilocalories (IT) kilocalories (th) kilogram-force meters kilojoules [kJ] kilowatt hours [kWh] megajoules [MJ] newton meters [Nm] therms watt seconds [Ws] watt hours [Wh] Output: Btu (IT) Btu (th) Btu (mean) calories (IT) calories (th) calories (mean) calories (15C) calories (20C) calories (food) centigrade heat units ergs foot pounds-force foot poundals gigajoules [GJ] horsepower hours joules [J] kilocalories (IT) kilocalories (th) kilogram-force meters kilojoules [kJ] kilowatt hours [kWh] megajoules [MJ] newton meters [Nm] therms watt seconds [Ws] watt hours [Wh] If you are converting Joules to Food Calories, please note: Notice there is a popup menu entry for calories (food), kilocalories (th), and kilocalories (IT). They are all about the same: 1 Joule(s) = 0.000239 kilocalorie. A food calorie is the same as a kilocalorie (th), but a food calorie is not the same as a calorie (in science). Your best choice is to convert calorie (food) to Joules. DON'T use any of the other calories in the menu because 1000 calories = 1 kilocalorie. Aprioriathletics.com