Now that we are in the 21st century tracking calories burned is not a lot easier thanks to digital wearables and tracking apps. The following are a few of these great options.
FitBit
FitBits are wireless-enabled wearable technology devices that measure data such as the number of steps walked, heart rate, quality of sleep, steps climbed, and other personal metrics involved in fitness.
Using a fitbit will help massively in staying on top of how many calories you have burned and will save you the hassle of calculating your calories burned yourself.
Punch trackers
These boxing specific trackers use motion sensors to keep tabs on everything from punch speed and power, to how long you can keep up the workrate before you tire. They also track things such as combinations thrown and your work rate, plus how many calories you have expended during your workout.
These are especially useful for if you are doing a punching based boxing workout to track the calories burned.