Compare calculators
Both calculators run independently — change the inputs on either side to compare results.
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.
Plumbing
Pipe Friction Loss Calculator
Calculates pressure loss (in PSI) due to pipe friction using the Hazen-Williams equation, given flow rate, pipe length, diameter, and material. Ideal for plumbers and engineers sizing water supply lines.
Fill in the required fields to see your result.
Key differences
| Drain Pipe Slope Calculator | Pipe Friction Loss Calculator | |
|---|---|---|
| Category | Plumbing | Plumbing |
| Inputs required | 2 | 4 |
| Result | Total Fall Required (inches) | Pressure Loss (PSI) |
| What it does | 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. | Calculates pressure loss (in PSI) due to pipe friction using the Hazen-Williams equation, given flow rate, pipe length, diameter, and material. Ideal for plumbers and engineers sizing water supply lines. |