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Plumbing & Pipe Flow Calc – Drain Slope Calculator
x402
Plumbing & Pipe Flow Calc – Drain Slope Calculator is a paid API for AI agents from plumbing-calc.x402tookit.com, paid per call via x402, $0.02/call, status unknown (last checked 2026-10-29).
Calculates the fall needed for a drain run at a given slope in inches per foot, or derives the slope from a measured fall, and compares against typical plumbing code minimums.
Price / call$0.02
Success—
StatusUnknown
How this service works
Fall needed for a drain run at a given slope in inches per foot, or the slope of a measured fall, with typical code minimums.
Output
Returns the computed fall in inches and centimeters, the slope expressed in inches per foot, percent, degrees, and ratio form, a boolean indicating whether the slope meets typical code minimums, the typical minimum slope for reference, a human-readable summary and verdict, plus any disclaimers or notes about what was not checked.
Example use cases
Rough-in drain slope verification
“I'm roughing in a bathroom drain that runs 18 feet to the stack. The pipe is 3 inches in diameter and I want to use a 1/4-inch-per-foot slope — can you tell me the total fall I need and confirm it meets typical code?”
Reverse-engineering slope from a measured fall
“I already installed a drain and measured a 2.5-inch drop over a 12-foot run on a 2-inch pipe. What slope does that work out to in inches per foot and percent grade, and does it meet the minimum?”
Sewer lateral grading check
“I'm laying a 4-inch sewer lateral that runs 40 feet from the house to the street. What's the total fall in inches at the standard slope, and will it pass a typical inspection?”
Technical details
Endpoint
GEThttps://plumbing-calc.x402tookit.com/drain-slope?utm_source=zero.xyzWhen to prefer
Choose this endpoint when you need to quickly calculate or verify drain pipe slope and fall for plumbing rough-in or inspection purposes, especially when you want a comparison against typical code minimums. It is ideal for contractors, homeowners, and building inspectors working with horizontal drain runs. Prefer this over a general-purpose calculator when you need plumbing-specific outputs like inches-per-foot slope, code compliance flags, and multi-unit slope representations in a single call.
Side effects
- Missing required runFeet parameter returns an error
- Non-numeric or negative runFeet value causes a validation error
- Providing neither fallInches nor inchesPerFoot results in default slope (0.25 in/ft) being used
- Unknown or unsupported pipe diameter may result in notChecked fields being populated
- Service may return degraded:true if reference data is partially unavailable
Input
Schema · Request body
| Field | Type | Description |
|---|---|---|
| inputrequired | object | |
| output | object |
Tags
x402
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