tankvolumecalc.com
Drawing № TVC-001 · Universal Tank Calculator

Exact volume for any tank, at any fill level.

Most tools only compute a full tank. This calculator solves the partial-fill problem with exact closed-form geometry — circular segments, ellipse sections, obround oil-tank profiles and dished propane heads — so the gallons at your dipstick reading are right, not approximated.

12 tank shapesGallons · Liters · ft³Liquid weight by substanceNo signup · runs in-browserPrintable fill charts
FIG. 1 — TANK CROSS-SECTION · LIVE
SCALE AUTO  ·  REV A
01 · Tank shape
02 · Dimensions
50%
Wetted depth—
Surface width—
Ullage—
Liquid volume at fill depth
—US gal
Total capacity—
Filled · liters—
Filled · ft³—
Percent full—
Liquid weight—
Remaining to full—

Exact segment geometry — see methodology. Dished-head propane math is documented there too.

One calculator per geometry, built deep.

SEC. 02 / SHAPE LIBRARY
HEADTVC-101

Horizontal Cylinder

Fuel, oil & water tanks lying on their side. Circular-segment partial fill.

 TVC-102

Vertical Cylinder

Standing water & chemical tanks. Linear gallons-per-inch.

 TVC-103

Rectangular Tank

Aquariums, sumps, totes and transfer tanks.

 OBROUNDTVC-104

Heating Oil Tank

True obround 275/330 profile — not an ellipse approximation.

 80% RULETVC-105

Propane Tank

ASME vessels with dished heads, gauge % and fill limits.

 TVC-106

Oval / Elliptical

True-ellipse horizontal tanks. Exact ellipse-section math.

 TVC-112

Dished Bottom

Vertical tanks on 2:1 ellipsoidal heads. Exact head math.

 TVC-107

Cone-Bottom

Industrial mixing & settling tanks with conical outlets.

 TVC-108

Sphere

Spherical vessels & floats. Spherical-cap fill volume.

 TVC-109

Frustum / Tapered

Buckets, hoppers and tapered vats.

 POPULARTVC-110

Pipe Volume

Volume & liquid weight per length of pipe, any diameter.

 TVC-111

Fill Time

How long to fill or drain a tank at a given GPM.

 SAFETY MATHTVC-401

Thermal Expansion

Ullage check, max safe temp, the math behind fill rules.

 FIELD TOOLTVC-301

Dip Chart Generator

Laminate-ready strapping chart for any tank, any dimensions.

Tank charts you can actually read.

SEC. 03 / DIP CHART LIBRARY

Inch-by-inch gallon tables for every standard tank — interactive on screen, printable as a clean one-page PDF for the boiler room wall.

275 gal oil V275 gal oil H330 gal oil V330 gal oil H500 gal oil UG550 gal oil UG1000 gal oil UG120 gal propane250 gal propane500 gal propane1000 gal propane55 gallon drum275 gallon ibc tote330 gallon ibc tote1500 gal oil UG2000 gal oil UG320 gal propane10 gal aquarium20 gal aquarium29 gal aquarium40 gal aquarium55 gal aquarium75 gal aquarium125 gal aquarium

Questions people ask.

SEC. 04 / FAQ
How do I calculate how many gallons are in my tank?

Measure the liquid depth with a stick, pick your tank shape above, enter the tank dimensions, and set the fill slider to your reading. The calculator returns gallons, liters and percent full using exact partial-fill geometry — or use a pre-built tank chart for standard tanks.

Why is partial-fill volume hard for round tanks?

In a horizontal cylinder the middle inches hold far more liquid than the top and bottom inches, so volume is not proportional to depth. This calculator solves the circular-segment area exactly instead of approximating.

Does this work for metric tanks?

Yes. Switch the dimension unit to centimeters or meters; results show gallons and liters side by side.

Is my data stored anywhere?

No. All math runs locally in your browser. Nothing you type is transmitted or stored.