Concrete Cylinder Calculator
Calculate concrete volume for cylindrical forms.
Cylinder Concrete Formula
Volume = π × diameter² ÷ 4 × height.
How Concrete Cylinder Volume Is Calculated
A concrete cylinder estimate uses the cylinder volume formula: radius squared multiplied by pi and height. Make sure diameter and height use the same unit before calculating, then convert the result to the volume unit needed for ordering.
Concrete Cylinder Example
For a round column or pier, divide the diameter by two to get the radius, calculate the circular area, and multiply by the height. For multiple identical cylinders, multiply the single-cylinder volume by the quantity.
Why Accurate Dimensions Matter
Small diameter errors can significantly change volume because the radius is squared. Form size, actual fill height and over-excavation can also increase the amount of concrete required.
Frequently Asked Questions
Can I use this for concrete piers?
Yes, when the pier is approximately cylindrical.
Should I add extra concrete?
A modest allowance is often useful for spillage, uneven excavation and measurement uncertainty.
Does the calculator include reinforcement?
No. Rebar volume is usually small compared with concrete volume and is estimated separately.
Calculation Assumptions and Practical Limits
Cylinder volume is πr²h. Use the inside form diameter and actual filled height when estimating concrete. Form size tolerance, overfill, spillage and uneven bases can make ordered quantity slightly higher than geometric volume.