Biggest Loser Cardio Max

Try investing in a Heart Rate Monitor.

or

You can do the math to get an approximation of your average heart rate whilst working out
(http://www.wikihow.com/Calculate-Your-Target-Heart-Rate)

Then once you know your average heart rate you can punch in the numbers here to figure out your calories burned during your workout.
(http://www.shapesense.com/fitness-exercise/calculators/heart-rate-based-calorie-burn-calculator.aspx)

Hope this helps!

I asked for one for valentines day Thank you.

Whoever you asked should be the good person they are and invest in one for you! Trust me I hate doing math so they literally take the guess work out of things.

A LOT of people I see use this one: http://www.amazon.com/Polar-Heart-Rate-Monitor-Purple/dp/B005M1P85O
(Polar brand). Since it shows you on the watch how many calories you burned.

I don't have the funds for one of those yet but I used my iPhone HRM App & cheap $20 HRM I picked up off Amazon and they're within ~5bpm of each other. So I take my heart rate every 5 minutes or so of exercise and find the mean between those numbers.

Try investing in a Heart Rate Monitor.

or

You can do the math to get an approximation of your average heart rate whilst working out
(http://www.wikihow.com/Calculate-Your-Target-Heart-Rate)

Then once you know your average heart rate you can punch in the numbers here to figure out your calories burned during your workout.
(http://www.shapesense.com/fitness-exercise/calculators/heart-rate-based-calorie-burn-calculator.aspx)

Hope this helps!

Thank you for this! I am saving for a HRM but using these formula's shows I am vastly overestimating my exercise! No wonder I am at a standstill. Also thank you to the bradXdale for tip on popular HRM. Will put on my birthday list ha ha.