Pipe Volume Calculator

Volume = cross-sectional area × length.

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Formula

V = π × ID² ÷ 4 × L

Example calculation

1.025 in ID × 100 ft → 4.29 US gal.

Practical HVAC use

Glycol fill and expansion tank sizing.

Common mistakes

Using nominal size instead of actual ID.

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Educational tool. Results are estimates from the stated formulas; always confirm with manufacturer data and the code adopted in your jurisdiction. All calculators