Compare calculators
Both calculators run independently — change the inputs on either side to compare results.
Plumbing
Pipe Flow Velocity Calculator
Calculates water velocity (in ft/s) inside a pipe from flow rate and pipe diameter, then checks whether it falls within code-acceptable limits for the selected application. Use it to avoid erosion, noise, or insufficient flow.
Fill in the required fields to see your result.
Plumbing
Drain Pipe Slope Calculator
Calculates the required vertical drop for a drain pipe based on its length and diameter to ensure proper self-cleaning flow. Use it when roughing in bathroom, kitchen, or floor drains to meet IPC and UPC plumbing code requirements.
Fill in the required fields to see your result.
Key differences
| Pipe Flow Velocity Calculator | Drain Pipe Slope Calculator | |
|---|---|---|
| Category | Plumbing | Plumbing |
| Inputs required | 2 | 2 |
| Result | Flow Velocity (ft/s) | Total Fall Required (inches) |
| What it does | Calculates water velocity (in ft/s) inside a pipe from flow rate and pipe diameter, then checks whether it falls within code-acceptable limits for the selected application. Use it to avoid erosion, noise, or insufficient flow. | Calculates the required vertical drop for a drain pipe based on its length and diameter to ensure proper self-cleaning flow. Use it when roughing in bathroom, kitchen, or floor drains to meet IPC and UPC plumbing code requirements. |