Compare calculators
Both calculators run independently — change the inputs on either side to compare results.
Civil
Culvert Sizing Calculator
Calculate the required culvert diameter to safely pass design stormwater flows under roads, driveways, or embankments. Helps engineers and contractors avoid undersized culverts that cause flooding or washouts.
Fill in the required fields to see your result.
Civil
Manhole Volume Calculator
Calculates the volume of concrete required to construct a circular manhole wall given the outer diameter, inner diameter, and height. Use it when estimating materials for sewer, drainage, or utility access structures.
Fill in the required fields to see your result.
Key differences
| Culvert Sizing Calculator | Manhole Volume Calculator | |
|---|---|---|
| Category | Civil | Civil |
| Inputs required | 4 | 3 |
| Result | Required Culvert Diameter (inches) | Concrete Volume (m³) |
| What it does | Calculate the required culvert diameter to safely pass design stormwater flows under roads, driveways, or embankments. Helps engineers and contractors avoid undersized culverts that cause flooding or washouts. | Calculates the volume of concrete required to construct a circular manhole wall given the outer diameter, inner diameter, and height. Use it when estimating materials for sewer, drainage, or utility access structures. |