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Tank Volume Calculator

Volume for various tank shapes. Free online Tank Volume Calculator. Calculate tank volume online — fast, accurate, mobile-friendly, no signup needed.

Cylindrical tank

Cubic feet
282.743339
US gallons
2,115.067201

Derivation

  1. ├── 01Givend = 6, h = 10
  2. ├── 02FormulaCubic feet: π × (t / 2)² × a
  3. ├── 03Compute Cubic feet282.743339
  4. ├── 04FormulaUS gallons: π × (t / 2)² × a × 7.48052
  5. └── 05Compute US gallons2,115.067201
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§01What is

Understanding the Tank Volume Calculator

The Tank Volume Calculator computes Cubic feet from 2 inputs: diameter (ft), height (ft). Volume for various tank shapes.

On a construction site, estimates that come in 10% off add up to six-figure overruns. Running the quantities with a calculator instead of a rule-of-thumb gets you closer to the truth with zero extra effort. The Tank Volume Calculator sits in that toolkit — it volume for various tank shapes. Enter your numbers above and the result updates instantly; every step of the math is shown in the Derivation panel so you can see exactly how the answer was reached.

§02The Formula

How it’s calculated

Cubic feet = π × (t / 2)² × a | US gallons = π × (t / 2)² × a × 7.48052

Where

d
Diameter (ft)
h
Height (ft)
Cubic feet
Output value
US gallons
Output value
§03Practical Example

Step-by-step walkthrough

Scenario

Apply the formula to a realistic set of inputs: Diameter (ft) = 6, Height (ft) = 10.

  1. 01Start by noting the input — Diameter (ft): 6.
  2. 02Start by noting the input — Height (ft): 10.
  3. 03Substitute these values into the formula: Cubic feet = π × (t / 2)² × a | US gallons = π × (t / 2)² × a × 7.48052
  4. 04Compute Cubic feet: the calculator returns 282.743.
  5. 05Compute US gallons: the calculator returns 2115.07.
  6. 06Cross-check the answer by opening the Derivation panel above — every line of math is shown so you can follow the computation end-to-end.
§04Variants

Common Tank Volume Problems

The formula gets rearranged depending on which variable you need. Here are the patterns you’ll run into in the real world — find the one that matches your problem and follow the worked steps.

01 · PATTERN

Diameter (ft) halved

d = 3 (from 6)

Keep every other input at its default and halve the diameter (ft). See how cubic feet responds.

  1. 01New Diameter (ft): 3
  2. 02Baseline Cubic feet: 282.743
  3. 03New Cubic feet: 70.6858
  4. 04Cubic feet decreases by 75% → use this sensitivity to plan for real-world variation.
02 · PATTERN

Diameter (ft) doubled

d = 12 (from 6)

Keep every other input at its default and double the diameter (ft). See how cubic feet responds.

  1. 01New Diameter (ft): 12
  2. 02Baseline Cubic feet: 282.743
  3. 03New Cubic feet: 1130.97
  4. 04Cubic feet increases by 300% → use this sensitivity to plan for real-world variation.
03 · PATTERN

Height (ft) halved

h = 5 (from 10)

Keep every other input at its default and halve the height (ft). See how cubic feet responds.

  1. 01New Height (ft): 5
  2. 02Baseline Cubic feet: 282.743
  3. 03New Cubic feet: 141.372
  4. 04Cubic feet decreases by 50% → use this sensitivity to plan for real-world variation.
04 · PATTERN

Height (ft) doubled

h = 20 (from 10)

Keep every other input at its default and double the height (ft). See how cubic feet responds.

  1. 01New Height (ft): 20
  2. 02Baseline Cubic feet: 282.743
  3. 03New Cubic feet: 565.487
  4. 04Cubic feet increases by 100% → use this sensitivity to plan for real-world variation.
§05FAQ

Frequently asked questions

Yes. The calculator implements the standard formula as documented and returns exact floating-point results. No approximations are used unless noted in the formula.
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