Compare calculators
Both calculators run independently — change the inputs on either side to compare results.
Civil
Culvert Design Calculator
Size a circular or box culvert to pass a design stormwater discharge using Manning's equation. Essential for highway engineers, drainage designers, and land developers ensuring roads stay clear during storm events.
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 Design Calculator | Manhole Volume Calculator | |
|---|---|---|
| Category | Civil | Civil |
| Inputs required | 5 | 3 |
| Result | Required Culvert Diameter (m) | Concrete Volume (m³) |
| What it does | Size a circular or box culvert to pass a design stormwater discharge using Manning's equation. Essential for highway engineers, drainage designers, and land developers ensuring roads stay clear during storm events. | 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. |