Fiber Optic Conduit Fill Ratio Calculator
Calculate cable cross-sectional occupancy in an optical duct or conduit and compare it with Corning cable-count-specific fill guidance.
Result
Formula
Calculation logicFormula definitions and substituted values.
Geometric conduit fill ratio (%)
Number of cables in the conduit * Fiber cable outside diameter (mm) ^ 2 / Conduit or innerduct inside diameter (mm) ^ 2 * 100
Number of cables in the conduit * Fiber cable outside diameter (mm) ^ 2 / Conduit or innerduct inside diameter (mm) ^ 2 * 100Corning recommended fill for cable count (%)
if Number of cables in the conduit = 1 then 65 else if Number of cables in the conduit = 2 then 31 else 40
if Number of cables in the conduit = 1 then 65 else if Number of cables in the conduit = 2 then 31 else 40Headroom to Corning recommendation (percentage points)
Corning recommended fill for cable count (%) - Geometric conduit fill ratio (%)
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