WHAT IS A K-FACTOR AND HOW TO CALCULATE IT?

K-factor is a number showing how fast a consumer uses fuel. Think of a k-factor as gallons per degree day, similar to miles per gallon. Please use the calculator below to find out what your k-factor is:

The K-factor is calculated by dividing the number of degree days between fuel oil deliveries by the gallons of fuel used between those deliveries.

Number Of Degree Days ÷ Number of Gallons used = K-factor

For example your customer has a 275 gallon tank

EXAMPLE:

470 Degree Days ÷ 200* gallons = 2.35 K-Factor

*275 gallon tank – reserve of 75 gals.

WHAT IS A DEGREE DAY?

A Degree Day is a numerical unit used to measure how hot or cold the weather is for a 24 hour period. It’s calculated by taking a median temperature of 65°. This is the average temperature that most homes don’t need energy assistance to keep warm or cool.  When the mean temperature goes below 65 degrees, you have a Degree day.

For example: In a 24 hour period the high temperature outdoors was 75 degrees, and the low was 45 degrees. That means the average temperature for that day was 60 degrees which is 5 degrees less than 65. That means that there were 5 degree days for that 24-hour period.

HOW TO CALCULATE DAILY DEGREE DAYS

  1. Add the low and high temperatures for each day together and then divide that number by 2 to get the mean temperature for that day.
  2. Subtract the mean temperature from the base figure of 65°
  3. You now have the daily degree days.

To find out the high and low temperatures for your area please visit the link below, select your state and click on Climate data

http://www.nws.noaa.gov/view/states.php ->  Select State -> Climate data

HOW DO I MAKE ADJUSTMENTS FOR HOT WATER?

You can use the Degree Day System year round by using the table below to adjust for Hot Water Installations. When the MEAN temperature is:

62° and above – add 6 Degree Days
58° to 61°  – add 5 Degree Days
54° to 57°  – add 4 Degree Days
50° to 53°  – add 3 Degree Days
46° to 49°  – add 2 Degree Days
43° to 45°  – add 1 Degree Day

WHAT ARE USABLE DEGREE DAYS?

Usable degree days allow you to know how many degree days you can allow to pass before making the next delivery.

WHAT IS THE DEGREE DAY NEXT DELIVERY?

The degree day next delivery is the number of projected degree days at which a customer will need fuel delivery.

WHAT IS A RESERVE?

Because an oil tank can’t be allowed to run out empty, a safety reserve is set up. Suggested reserves are:

275 tank – 75 gallons

550 tank – 150 gallons

1,000 tank – 250 gallons

1,500 tank – 300 gallons

HOW TO CALCULATE “USABLE DEGREE DAYS” IN A TANK?

Multiply the number of gallons desired for your next delivery by the K-Factor to give you how many degree days can elapse before making the next delivery.

Number of gallons * K-Factor = Number of degree days until next delivery

EXAMPLE: 275 Gallons (tank capacity) minus reserve of 75 gals. = 200 gals.

this is 200 gals. of usable fuel in the tank.

200 (gals. usable fuel) x 2.35 (K-Factor) = 470 usable degree days

HOW TO CALCULATE WHEN THE NEXT DELIVERY IS DUE?

Add “Degree Day of Usable Fuel” to the accumulated degree days recorded on the day of delivery. The resulting number is the Degree Day Next Delivery.

EXAMPLE: 470 (Degree Day Usable Fuel) + 1390 (Total D.D. Heat & Hot Water on day of delivery) = 1860 Degree Days Next Delivery.

This tells you that when the accumulated degree days in your log reach 1860 you need to schedule this customer for oil delivery.