Depends on how hard you go at it, but I'd guess somewhere in the 1200-2000 calorie range.
Biking for 45 minutes will burn 100 calories.
1 year
It depends on how long you want to take to lose the 50 pounds. To lose one solid pound fo weight, you must burn 3,500 more calories than you consume. That means, to lose 50 pounds, you must burn 175,000 more calories than you consume.
* yes about 5 pounds This is wrong. There are 3500 calories in a pound. You must "lose" 3500 calories through diet or exercise to lose 1 pound. It would take a reduction of 17,500 calories to lose 5 pounds.
There is 3500 calories in 1 pound of your body fat. The average person burns around 2000 - 2500 calories per day. It should take around 175 days for you to lose 30 pounds.
you will lose about 5 pounds. Because for every 3400 calories you burn it is a pound, so take 17500 and divide it by 3400
there are 3,500 calories in a pound so times that by 23 and your answer is80,500
1200 Calories
Please do not try to lose fifteen pounds. You are very slender already. If you lose fifteen pounds, you will weigh 90 pounds and be underweight and unhealthy. 500 calories a day is not enough calories to maintain a healthy body. You will become sick, and your face will start to sink in and become unattractive. Stick to a diet of around 1500 calories a day and stay at 105 pounds. Your body will thank you.
You have to burn 3,500 calories more than what you consume to lose 1 pound. So to lose 35 pounds you will have to burn 122,500 extra calories.
It all depends on your weight, how often you run, how far you run, and what you eat. Well, firstly, you must burn around 3,000 calories to lose a pound. It depends on how many pounds you want to lose. Ex. 2 pounds lost = around 6,000 calories burned.
It is pysically impossible to lose 7 pounds in a week.
The length of time it will take to lose 20 lbs. depends on the amount of calories you take in and how active you are. At 5'1 and 120 pounds it will take approximately two to three months.