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Tank Volume Calculator — Capacity, Partial Fill, Gallons, Litres & Weight

Editable live calculator

Change any input — the result updates immediately

No hidden assumptions. Inputs, units and the working stay visible so you can check the calculation.

Tank shape Dimension unit Tank length / straight section Tank inside diameter Current liquid depth from bottom Use the same dimension unit selected above.Liquid density (kg/L, optional) Water is near 1 kg/L under common conditions; replace with the actual liquid density or use 0 to skip.Fill / drain flow (L/min, optional) A steady-flow timing estimate only.

Calculated result

695.67 L current · 19.55% full

3,558.4 L total capacity · 2,862.73 L remaining

940.03 US gal · 782.74 Imp gal · 3.5584 m³ · 125.664 ft³ total

183.78 US gal current · 153.03 Imp gal current

Current liquid mass: 695.67 kg at 1 kg/L

Fill/drain timing skipped.

Show the working

1. horizontal cylinder total capacity = 3.5583999 m³ = 3,558.4 L.
2. Entered fill depth = 1 ft; current liquid volume = 0.6956711 m³.
3. Percent full = 0.6956711 ÷ 3.5583999 × 100 = 19.5501%.

Geometric inside-volume model. Baffles, dished/non-matching heads, wall thickness, unusable heel volume, fittings and real tank calibration can change usable capacity.

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