The Cable Tray Fill Calculator sums the cross-sectional area of your cables against the usable area of a cable tray, reporting the fill percentage, remaining space and how many more cables of a given size would fit.
Cable Tray Fill Calculator
Check cable tray fill: enter tray width, height and type, then your cable diameters and quantities. Get the fill percentage, remaining space and how many more cables fit.
Inputs
Result
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tray fill
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remaining (mm2)
About Cable Tray Fill Calculator
Features
- Ladder, ventilated and solid-bottom trays
- Per-cable diameter and quantity
- Fill percent and remaining area
- How-many-more fit estimate
How to Use
- Enter tray width, height and type.
- List cables as diameter:quantity per line.
- Read the fill percent and remaining space.
Examples
Example: 300 mm wide x 100 mm deep ladder tray (50% fill = 15000 mm2 allowed) with ten 25 mm cables (each 491 mm2, total 4910 mm2) -> about 16% tray fill.
Benefits
- Verify a tray is not overfilled
- Plan additional cable pulls
Frequently Asked Questions
What is tray fill?
It is the share of the tray cross-section occupied by cables. NEC limits it so cables can be supported and cooled.
What fill percent is allowed?
Typically 50% for ladder and ventilated trays and 40% for solid-bottom trays (for one or more multiconductor cables). The tool uses your selected value.
How are cables measured?
Use the cable outer diameter. Area is treated as a circle: pi/4 x diameter^2.
Is my data saved?
No. All math runs in your browser.