Calculator Form
Enter any circular measurement. The calculator converts it into cubic feet using depth.
Example Data Table
These examples use circular bases and straight vertical depth.
| Project | Input | Depth | Quantity | Waste | Approx Result |
|---|---|---|---|---|---|
| Round planter | Radius 2 ft | 1.5 ft | 1 | 5% | 19.79 cu ft |
| Concrete pier hole | Diameter 18 in | 4 ft | 4 | 10% | 31.10 cu ft |
| Water tank | Diameter 6 ft | 5 ft | 1 | 0% | 141.37 cu ft |
| Mulch ring | Area 50 sq ft | 0.25 ft | 2 | 8% | 27.00 cu ft |
Formula Used
The calculator treats the circle as the base of a cylinder. It then multiplies the circle area by depth.
Circle area from radius:
A = π × r²
Radius from diameter:
r = d ÷ 2
Radius from circumference:
r = C ÷ 2π
Volume:
V = A × depth
Total volume with quantity and waste:
Total = V × quantity × (1 + waste% ÷ 100)
Cubic yards are found by dividing cubic feet by 27. Gallons are found by multiplying cubic feet by 7.48051948. Liters are found by multiplying cubic feet by 28.316846592.
How To Use This Calculator
- Select radius, diameter, circumference, or known circle area.
- Enter the circular value and choose the matching unit.
- Enter the depth or height of the circular space.
- Add the number of identical circles, if needed.
- Add a waste percentage for spills, compaction, or trimming.
- Enter price per cubic foot when you want a cost estimate.
- Choose a rounding option for ordering or reporting.
- Press the calculate button to show the result above the form.
- Use CSV or PDF export for saving the calculation.
Circular Cubic Feet Planning Guide
Why Circular Volume Matters
A circular cubic feet calculator helps when a round base has depth. Examples include wells, planters, tanks, holes, forms, and storage bins. The tool treats the circle as the base of a cylinder. It then multiplies base area by depth.
Input Choices
Accuracy starts with the right input type. You may enter radius when you know the center to edge distance. You may enter diameter when you measured across the circle. You may enter circumference when a tape was wrapped around the outside. You may also enter known circle area. The calculator converts each option into a common base area.
Unit Handling
A radius in inches and a depth in feet can be mixed. The script converts every length to feet first. It converts square units when area is used directly. This keeps the final answer in cubic feet. It shows cubic yards, gallons, and liters for planning.
Waste And Quantity
Extra percentage is useful for waste. Concrete, soil, gravel, mulch, and liquid jobs rarely match perfect math. Add a small allowance when edges are uneven. Add more when material compacts or spills. The quantity field helps when several identical circles are needed.
Export And Review
The result section is placed below the header. It appears above the form after submission. The details table shows area, depth, volume, waste volume, and estimated cost. You can export the result as a CSV file. You can also download a simple PDF summary.
Practical Checks
Use the example table before entering your own values. It shows common circular projects and their expected volumes. These examples make it easier to check if your answer feels reasonable. Always measure twice before ordering material. Round final purchases up when delivery sizes are fixed. For critical construction work, confirm values with project drawings and local specifications.
Measurement Tips
Keep notes beside each project row. Record the input method, unit, and allowance used. Compare the cubic feet with supplier package sizes. It also prevents paying for far too much material. Save the output before changing values, especially when sharing estimates with a crew on busy job days during ordering, billing, and site planning stages.
FAQs
What does this calculator measure?
It measures cubic feet for a circular base with depth. This is the same volume shape as a cylinder.
Can I use diameter instead of radius?
Yes. Choose diameter as the input type. The calculator divides it by two to find radius before calculating area.
Can I enter circumference?
Yes. Enter circumference when you measured around the circle. The calculator converts circumference into radius using the circular formula.
What is waste percentage?
Waste percentage adds extra volume for spills, compaction, cuts, uneven holes, and ordering safety. Use higher values for rough work.
Why does the calculator show cubic yards?
Cubic yards are common for concrete, soil, gravel, and mulch orders. One cubic yard equals 27 cubic feet.
Can I calculate more than one circle?
Yes. Use the number of circles field. The calculator multiplies one circular volume by the quantity entered.
Does this work for tanks?
Yes, if the tank has a circular base and straight sides. Use the inside diameter and inside height for capacity.
Is the PDF export automatic?
The PDF button appears after a result is calculated. It downloads a simple summary of the visible result table.