Oil Tank RouteResidential field tools

Verified chart calculator

Oil tank gauge and stick-reading calculator

Convert a gauge fraction or measured liquid depth into remaining gallons and a conservative fill amount using a verified manufacturer chart.

Start the tool Check sources

Field notes

Before entering a reading

  1. 01

    Confirm the model and vertical orientation; a chart for another tank can be materially wrong.

  2. 02

    A float gauge is approximate. A clean stick reading can help confirm it, but never open or probe a tank when a leak or unsafe condition is suspected.

  3. 03

    The result is planning information, not a delivery authorization or fuel-sale measurement.

Gauge / 04

Enter the reading

Only tank/orientation combinations with a reviewed chart are available. Your reading stays in this browser session and is not sent in analytics.

For fractions enter a decimal: 0.125 = 1/8, 0.25 = 1/4, 0.5 = 1/2. For a stick, enter liquid depth from the tank bottom.

Gauge troubleshooting

A strange reading is a diagnosis prompt, not a tank verdict

Keep the tank closed. Match the symptom to the narrowest qualified next step.

  1. 01Gauge stays on one mark

    Recheck recent deliveries and usage. Ask a heating-oil service technician to inspect the gauge rather than forcing the float.

  2. 02Gauge and stick disagree

    Confirm model, orientation, chart, tank tilt, and reading method. Never open or probe a tank when an unsafe condition is suspected.

  3. 03Cracked gauge or component drip

    Stop treating the number as reliable and request service. Visible oil, fresh staining, or strong odor enters the leak-response route.

  4. 04Vent whistle is weak or silent

    Do not authorize a delivery based on the gauge result alone. Tell the supplier and have the fill and vent system checked.

Shared tank data

Verified models available on this route

Granby 204201P Standard 20Plus60 x 27 x 44 in / 275 galGranby Standard 20Plus product table and U.S. vertical capacity chart
Granby 205201P Standard 20Plus72 x 27 x 44 in / 330 galGranby Standard 20Plus product table and U.S. vertical capacity chart
Granby 208101 Standard30 x 27 x 44 in / 138 galGranby Standard residential tank product table and U.S. vertical capacity chart

Route-specific question

One distinction that matters

How does the calculator avoid a linear estimate?

It finds the two verified chart rows around the reading and interpolates only within that chart interval.

What if the gauge is stuck or does not match a stick reading?

Do not force the float or open the tank to troubleshoot it. Recheck the model and orientation, compare only with a safe reading method, and ask a heating-oil service professional to inspect the gauge, vent, and tank when readings stay inconsistent.

Does a zero reading prove the tank is empty?

No. A failed float, wrong chart, tank tilt, or reading error can produce a false low result. Treat the gauge as approximate and verify before authorizing a delivery.

Source boundary

Official source material

Model values require manufacturer support; safety and removal guidance uses official public-agency material. Verification date: 2026-08-02.

  1. Granby Standard 20Plus residential oil tanks

    Manufacturer model dimensions and orientation; verified 2026-08-01.

  2. Granby U.S. vertical tank capacity chart

    Manufacturer gallons-by-inch table, stated precision +/-2%; verified 2026-08-01.

  3. Roth double-wall heating-oil tanks

    Manufacturer nominal capacities and body dimensions; verified 2026-08-01.

Continue the route

Use the next tool only when the job changes.

14 / Gauge serviceTroubleshoot a tank gaugeSeparate a coarse or stuck reading from tank condition and release signs.06 / DeliveryCheck a deliveryCompare the truck ticket with before-and-after chart readings and keep a private tank passport.07 / UsageEstimate days remainingUse your own consumption rate to turn gallons into a fuel runway.