Compare calculators
Both calculators run independently β change the inputs on either side to compare results.
Plumbing
Pipe Flow Rate Calculator
Calculates the volumetric flow rate of water through a pipe in gallons per minute. Use it when sizing pumps, irrigation lines, or plumbing systems where you know pipe diameter and water velocity.
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 Rate Calculator | Drain Pipe Slope Calculator | |
|---|---|---|
| Category | Plumbing | Plumbing |
| Inputs required | 2 | 2 |
| Result | Flow Rate (GPM) | Total Fall Required (inches) |
| What it does | Calculates the volumetric flow rate of water through a pipe in gallons per minute. Use it when sizing pumps, irrigation lines, or plumbing systems where you know pipe diameter and water velocity. | 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. |