Condensate drainage
Condensate Drain Pipe Fall Calculator
Convert a constant pipe slope into total elevation drop and downstream elevation.
Fall inputs
The selected slope is an assumption. Verify project drainage requirements, trap arrangements and termination elevations separately.
Enter run, slope and starting elevation.
Condensate fall result
Elevation drop
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—Total fall
—End elevation
—Applied slope
—Fall per metre
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How condensate pipe fall is calculated
For a constant slope, elevation change is simply run length multiplied by the slope as a decimal.
Fall = Run × (Slope ÷ 100)
Downstream elevation = Starting elevation − Fall
Downstream elevation = Starting elevation − Fall
Worked example
A 12 m run at 1% slope drops 0.12 m. Starting at 100.00 m gives a downstream elevation of 99.88 m.
Why the starting datum matters
A fall value is useful for routing, but the actual construction point must be tied to a consistent project datum. Small elevation differences can matter when working around ceilings, traps or equipment bases.
Limitations
This does not prescribe the required slope or verify hydraulic or code compliance.
Frequently Asked Questions
Can slope be zero?
Mathematically yes, although that means no elevation drop.
Can I use feet?
Yes.