Heating oil usage calculator
The most accurate usage number comes off two delivery slips: gallons delivered, divided by the days between fills. No slips handy? A square-footage estimate gets you in the neighborhood. Both run right here in your browser.
Fill in the fields to calculate.
What drives heating oil usage
- Weather, measured in degree days. Most of your oil goes to matching the cold outside. Degree days measure how cold a stretch ran, and oil companies divide them by gallons burned to get your home's K-factor. See heating oil K-factor explained.
- Thermostat habits. Holding the house warmer burns more oil. Setbacks overnight and while the house is empty trim usage, and the savings add up over a full season.
- The building envelope. Insulation depth, air sealing, and window quality set how fast the house loses the heat you paid for. The insulation choices in the quick estimate are really envelope grades.
- Burner nozzle size. The nozzle meters oil in gallons per hour while the burner runs, so nozzle size times run time is your usage. Sizing it is a licensed technician's call at the annual tune-up, not a homeowner adjustment. The nozzle conversion chart turns a stamped rating into actual flow at your pump pressure.
Once you know your gallons per day, see when to order heating oil for turning that rate into a reorder routine.
Worked example: two delivery slips
The arithmetic is one division. Take the gallons delivered at the second fill and divide by the number of days between the two fill dates, and that is your gallons a day. Multiply by 30 for a month. It only works if both deliveries filled the tank. If either one stopped short, the gallons on the slip no longer match the gallons you burned in between.
| Step | Value |
|---|---|
| Previous fill (from the older slip) | 1 December |
| This fill (from the newer slip) | 10 January |
| Days between | 40 |
| Gallons delivered at this fill | 220 |
| Gallons a day (220 divided by 40) | 5.5 |
| Gallons per 30 days (5.5 times 30) | 165 |
This is an example calculation, not a measured household. The two dates and the gallons are example inputs; every figure below them is arithmetic on those two numbers. Your own slips give your own rate, and it will change with the weather.
Common questions
How many gallons of heating oil does a typical home use per year?
Many Northeast oil-heated homes land between 650 and 1,000 gallons a year, but the spread is wide. Home size, insulation, winter severity, and whether oil also makes hot water all move the number. Two delivery slips in the calculator above give you yours.
How much oil does a home burn per day in winter?
3 to 7 gallons on cold days for a typical home, more in a deep freeze. Mild fall and spring days burn far less. The delivery history mode turns two fills into your own daily rate instead of a typical one.
Does hot water change my heating oil usage?
Yes. If the oil burner also makes your domestic hot water, you burn oil in July as well as January, and the quick estimate adds 80 gallons a year for it. Summer deliveries are the giveaway that your hot water runs on oil.
Which mode should I trust?
Delivery history, whenever you have two slips from full fills. It measures your actual house, your weather, and your habits. The home size estimate is for planning ahead, like budgeting for a house you are about to buy.
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