Insert a stick into your home heating oil tank until it touches the bottom. Make sure your stick is vertical; if it goes in at an angle you’ll get a reading that’s higher than your oil level. Remove the stick from the oil tank to see how much of it has been immersed in the oil. If you have a heating oil chart for you oil tank you can use this to calculate the volume left in your tank. If you don’t have a chart, simply see where the oil is on your stick. If only the lower part of the stick is covered, you know levels are getting low and you’ll need to schedule a kerosene  delivery soon.