# Calculating the Cost of Medical Device Electricity Use

1. Look at the label on your concentrator or other medical device that you are using. It states the number of volts and amps the concentrator uses. If not found on the concentrator, look for it in the manual or ask your oxygen provider.
2. As an example, we will use 115 volts at 4 amps. To convert to watts (W), multiply volts and amps: 115 volts x 4 amps = 460W.
3. Next, calculate the number of kilowatt (KW) hours you use per year. Multiply the watts your concentrator uses by .001 KW/W to convert watts to kilowatts. In our example, 460W x .001 KW/W = 0.46KW.
4. Multiply this answer by 24 hours/day x 365 days/year if you are a continuous user. If you do not always have your oxygen on, multiply by the average number of hours used per day and then by 365 days/year.
5. To continue the example, 0.46KW x 24 hours/day x 365 days/year = 4,029.6 KWH/Y. This is the kilowatt hours you have used to run your concentrator the past year.
6. Now, multiply the above result by the cost per kilowatt hour your electric company charges you. It may be listed on your bill or you could call their office. Let’s say they charge you 8 cents per kilowatt hour (prices will vary widely depending on the region in which you live). To finish our example: 4,029.6 KWH/Y x \$0.08 = \$322.37. This is the amount you paid for electricity to run your concentrator and can deduct as a medical expense.