Heating Oil: everything for the oil-heated home

Stick the tank, read the chart, know when to order — the full toolkit for 275/330 obround tanks and underground cylinders, built on geometry that matches the manufacturer gauge books.

If you heat with oil, two numbers run your winter: how much is in the tank right now, and how fast you’re burning it. Both come off the same gauge stick — and because a 275 or 330 tank is an obround shape, not a plain cylinder, an inch near the middle holds far more than an inch near the bottom. That’s why a real chart matters and why eyeballing the gauge misleads. The tools below cover the whole loop: calculate the volume for your exact tank, read or print a chart, learn the stick method, and know when to reorder before a cold snap catches you low. Every chart is built from geometry checked against the manufacturer gauge books, so the gallons you read are the gallons you have.

Heating Oil: everything for the oil-heated home

Calculators

Heating oil tank calculator (true obround)

Universal calculator — any tank

Fill & drain time

Charts

275 vertical chart

330 vertical chart

1000 gal underground

All oil charts

Guides

How much oil is left (stick method)

How long will my oil last

Gauge stuck? Check it

Water in the tank

Reference

275 tank dimensions & weight

What heating oil weighs

The obround formula