Compare calculators
Both calculators run independently β 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
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.
Key differences
| Culvert Sizing Calculator | Culvert Design Calculator | |
|---|---|---|
| Category | Civil | Civil |
| Inputs required | 4 | 5 |
| Result | Required Culvert Diameter (inches) | Required Culvert Diameter (m) |
| 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. | 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. |