Title says it all. How does exercise equipment such as treadmills or exercise bikes determine how many calories the user has burned? Does it ask for the persons weight to be put in or does it just guess how many is burned by a set weight?
Sometimes it takes the number of repetitions like on some rowing machines. Others might ask age weight gender and then calculate the answer very roughly. I believe some can see how many reps you have done per min or somthing then work it out.
They are good rough counters but half an hour of exercise comes out at about 300calories on the machines.