Oil Tank Route.Property record research
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Shape-based estimator

Oil tank capacity calculator

Estimate a capacity range from tank shape and measured dimensions. The result shows measurement uncertainty and never claims a model match without a label.

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Field notes

Measure the tank body

  1. 01

    For an obround tank, measure the straight body length plus the full cross-section width and height.

  2. 02

    For a cylinder, enter body length and diameter; the calculator uses the smaller width/height entry as diameter.

  3. 03

    The displayed range assumes +/-0.5 inch measurement uncertainty and excludes wall thickness, fittings, and required headspace.

Capacity / 07

Measure the tank body

The estimator uses the selected shape formula and repeats the calculation at +/-0.5 inch. Values remain in sessionStorage only.

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 204701P Standard 20Plus60 x 44 x 27 in / 275 galGranby Standard 20Plus product table
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
Roth DWT 1000L43 x 28 x 61 in / 275 galRoth double-wall heating-oil tank dimensions
Roth DWT 1000LH low height51 x 30 x 54 in / 275 galRoth double-wall heating-oil tank dimensions

Route-specific question

One distinction that matters

Why is the result a range instead of one exact gallon number?

Small dimension errors compound across a three-dimensional shape, and external measurements include material that is not liquid volume.

Property transaction or missing history?

Use the measurement. Research the property record.

If you are buying, selling, or trying to explain an unknown tank, send the address. We cross-check public records, locate the correct agency route, and explain the next action.

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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.

01 / IdentifyIdentify a tankStart with shape, orientation, label, and dimensions.02 / CompareCompare sizesUse one verified model table shared by every tool.03 / VerifyCheck a 275-gallon tankResolve the most common nominal size without assuming one body shape.