Cubic Feet Cylinder Calculator — Cylinder Volume in ft³
Enter the diameter and height of a cylinder (both in feet) to find its volume in cubic feet, along with conversions to cubic yards, cubic meters, liters and US gallons — plus the full surface area breakdown.
ft
ft
V = π × r² × h — volume of a cylinder in cubic feet
V
35.34 ft³- 1
Radius
3 ÷ 2 = 1.5 - 2
Base area (circle)
π × 1.5² = 3.14159 × 2.25 = 7.0686Area of the circular cross-section. - 3
Volume
7.0686 × 5 = 35.3429
How does this calculator work?
Cylinder volume = π × r² × h, where r is the radius (diameter ÷ 2) and h is the height, both in feet. The result is in cubic feet. A 3 ft diameter, 5 ft tall cylinder holds about 35.34 ft³ ≈ 264 US gallons. Enter diameter and height above to get the exact volume and all unit conversions.
Formula
How this is calculated
A cylinder's volume is the area of its circular base multiplied by its height: V = π × r² × h. Because it is often easier to measure the diameter than the radius, this calculator accepts the diameter and divides by two internally. Pi (π ≈ 3.14159) is the ratio of a circle's circumference to its diameter and appears because the base is a circle.
All input dimensions must be in feet so that the output is in cubic feet (ft³). If you have inches, divide each by 12 first. If you have metres, multiply each by 3.28084. The conversion factors used are: 1 ft³ = 27 yd³ (exact), 1 ft³ = 1728 in³ (exact), 1 ft³ = 0.0283168 m³, 1 ft³ = 28.3168 L, 1 ft³ ≈ 7.48052 US gallons.
The calculator also outputs the lateral (side) surface area = π × d × h, the base area = π × r², and the total surface area = lateral + 2 × base. Common real-world uses include calculating the volume of a round water tank, a concrete column, a grain silo, a pipe section or a cylindrical storage drum.
Frequently asked questions
V = π × r² × h. Measure the radius (half the diameter) and height both in feet, then multiply π × r² × h. For example, a cylinder with diameter 3 ft and height 5 ft has volume π × 1.5² × 5 ≈ 35.34 ft³.
Divide each measurement in inches by 12 to convert to feet first, then apply V = π × r² × h. Alternatively, calculate the volume in cubic inches (π × r² × h in inches) and divide by 1728.
Calculate the volume in cubic feet (V = π × r² × h) then multiply by 7.48052. For example, 35.34 ft³ × 7.48052 ≈ 264 US gallons.
Also known as
TG we-Calculate Editorial Team. (2026). Cubic Feet Cylinder Calculator — Cylinder Volume in ft³ [Online calculator]. TG we-Calculate. https://we-calculate.com/calculator/cubic-feet-cylinder-calculator
TG we-Calculate Editorial Team. "Cubic Feet Cylinder Calculator — Cylinder Volume in ft³." TG we-Calculate. 2026. https://we-calculate.com/calculator/cubic-feet-cylinder-calculator.
TG we-Calculate Editorial Team, "Cubic Feet Cylinder Calculator — Cylinder Volume in ft³," TG we-Calculate, 2026. [Online]. Available: https://we-calculate.com/calculator/cubic-feet-cylinder-calculator
@misc{wecalculate_cubic_feet_cylinder_calculator, title = {Cubic Feet Cylinder Calculator — Cylinder Volume in ft³}, author = {{TG we-Calculate Editorial Team}}, howpublished = {\url{https://we-calculate.com/calculator/cubic-feet-cylinder-calculator}}, year = {2026}, note = {TG we-Calculate} }
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