Free Tools
Free Tool
Deflection Analyzer
Enter three survey points and see how far the middle point deviates from the straight baseline between the two ends — updated live as you type.
Inputs
Horizontal (ft)
Elevation (in)
P₁
P₂
P₃
P₁'s horizontal position is fixed at 0. Horizontal distances may use any unit as long as both use the same one; Δ is reported in the elevation unit.
Formula
Δ=Y2−Y1+(L12L)(Y3−Y1)
Positive Δ = hogging (crown up) · Negative Δ = sagging (dip down)
Results
| Total profile length (L) | — |
| Baseline elevation at P₂ | — |
| Deflection (Δ) | — |
| Condition | — |
| Measured deflection (|Δ|) | — |
| Allowable deflection (L / 360) | — |
| Status | — |
|Δ| is checked against the allowable deflection L / 360; adjust the ratio to match your governing standard.
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