Calories (15 °C) to watt seconds converter on this page calculates how many watt seconds are in 'X' calories (15 °C) (where 'X' is the number of calories (15 °C) to convert to watt seconds). In order to convert a value from calories (15 °C) to watt seconds (from cal to Ws) just type the number of cal to be converted to Ws and then click on the 'convert' button.