Compare calculators
Both calculators run independently — change the inputs on either side to compare results.
Plumbing
Drainage Pipe Slope Calculator
Calculates the required slope and total vertical fall of a drainage pipe to achieve self-cleaning sewage flow over a given horizontal distance. Essential for plumbers designing gravity-fed drain systems.
Fill in the required fields to see your result.
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.
Key differences
| Drainage Pipe Slope Calculator | Pipe Flow Velocity Calculator | |
|---|---|---|
| Category | Plumbing | Plumbing |
| Inputs required | 4 | 2 |
| Result | Required Fall (inches) | Flow Velocity (ft/s) |
| What it does | Calculates the required slope and total vertical fall of a drainage pipe to achieve self-cleaning sewage flow over a given horizontal distance. Essential for plumbers designing gravity-fed drain systems. | 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. |