Awesome!
Great tool, quick and easy to use. Love it
Response from developer
Thanks a lot for the review!! That helps me out a ton. Feel free to reach out to me if you have any questions - james@jamesmckinney.xyz
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About
This app calculates conduit fill percentages based on NEC 2023 standards. It helps electricians determine if wires will fit in a conduit or find the smallest suitable conduit for a given set of wires. Features include real-time status updates, history, and export options.
✓NEC 2023 compliant calculations
✓Forward and reverse calculation modes
✓Real-time fill percentage status
✓Supports multiple conduit and wire types
✓Nipple calculation mode
✓Calculation history with job site grouping
✓Export and share results
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What's New in FILL ◦ Conduit Fill Calculator
1.2.0
July 30, 2026
FIXED: Deleting one saved calculation. Swiping a row in History used to throw you back to the calculator, so Clear All History was the only thing that worked. Now swipe left, tap DELETE, and just that one entry is gone. Swiping also closes any row you left open, and tapping an open row closes it instead of reloading it. NEW: Email Support, in Settings. It opens your mail app already addressed to me, with your version, build and phone details filled in. If FILL gets something wrong, or you need something it does not do yet, that button is the fastest way to tell me. Settings now shows your exact version and build too.
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In-App Purchases
$9.99
FILL Pro
Unlock all conduit types, reverse calc, and history
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FAQ
How many calculations can I do for free with FILL?
You can perform 3 complete calculations for free without any sign-up. This allows you to test the app's functionality before purchasing the Pro upgrade.
What is the cost of the Pro upgrade for FILL?
The Pro upgrade for FILL is a one-time purchase of $9.99. This unlocks unlimited calculations, all conduit types, calculation history, and export features permanently.
Does FILL have ads?
No, FILL is designed without advertisements. The developer states it is built for the trade and aims to be a clutter-free tool.
What NEC edition does FILL use?
FILL is based on the NEC® 2023 Edition. It uses Chapter 9, Tables 1, 4, and 5 for its calculations.
Can I save my calculations in FILL?
Yes, every calculation in FILL auto-saves and can be organized by job site area. You can easily reload saved entries for quick reference.
What devices is FILL available on?
FILL is currently available for iPhone and iPod devices. It is designed for mobile use in the field.
How often is FILL updated?
The latest version, 1.0.9, was released on June 17, 2026. Updates are provided to ensure the app remains current with relevant standards and features.
Can I share my conduit fill calculations from FILL?
Yes, the Pro version of FILL allows you to copy or share your fill calculations as formatted text. This is useful for documentation, inspection preparation, or sending results to others.