What this calculator does
The Softball Calories Burned Calculator estimates how much energy you use while playing softball. It uses the universal MET (metabolic equivalent of task) energy expenditure model, where one MET is roughly the energy cost of sitting quietly. Different softball roles have different intensities, so you pick the activity that best matches what you did. The MET values used here are drawn from the Japanese National Institute of Health and Nutrition's revised Physical Activity METs Table, which itself adapts the international Compendium of Physical Activities. The formula and values are universal and not specific to any country.
How to use it
Choose your activity from the dropdown: umpire (4.0 METs), practice (4.0 METs), general play (5.0 METs), or pitching (6.0 METs). Enter how long you were active in minutes and your body weight in kilograms. If you only know your weight in pounds, multiply by 0.45359237 to convert to kilograms first. The calculator returns the exercise intensity (the MET value) and the estimated calories burned in kilocalories.
The formula explained
The core equation is $$\text{kcal} = \text{MET} \times \text{weight(kg)} \times \text{hours} \times 1.05$$ The factor 1.05 represents kilocalories burned per kilogram of body weight per hour at one MET. Because duration is entered in minutes, the tool first converts it to hours by dividing by 60. Because the MET value already includes resting metabolism, the result is a gross figure rather than a net "extra" calorie count.
Worked example
A 44 kg player plays general softball (5.0 METs) for 60 minutes. Duration in hours is \(60 / 60 = 1.0\). Calories burned $$= 5.0 \times 44 \times 1.0 \times 1.05 = \textbf{231 kcal}$$ A 70 kg pitcher (6.0 METs) for 90 minutes burns $$6.0 \times 70 \times 1.5 \times 1.05 = \textbf{661.5 kcal}$$
FAQ
Is this exact? No. It is an estimate. Actual expenditure varies with fitness, technique, effort and individual metabolism.
Why does duration use hours? The MET formula is defined per hour, so minutes must be divided by 60.
What if I weigh myself in pounds? Multiply your weight in pounds by 0.45359237 to get kilograms, then enter that value.
