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 helps electricians and apprentices quickly calculate conduit fill percentages based on NEC codes. It supports various conduit and wire types, offering reverse sizing and a special mode for short conduit runs. Pro features include unlimited calculations, job history, and data export.
✓Conduit fill percentage calculation
✓Reverse conduit sizing
✓Supports NEC 2023 and 2026
✓Multiple conduit and wire types
✓Nipple mode for short runs
✓Job history and data export (Pro)
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What's New in FILL ◦ Conduit Fill Calculator
1.4.1
November 4, 2026
Fixes for FILL 1.4.0: the + Add Wire button no longer gets cut off, and the screen scrolls if you use large text. FILL Pro results change as you add wires or pick a different conduit, and tapping New clears the old result. Tap Save to History to keep a calculation.
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Subscriptions & In-App Purchases
$7.99
FILL Pro
Unlock all conduit types, reverse calc, and history
User reviews
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FAQ
What is the short name for FILL ◦ Conduit Fill Calculator?
The short common name for FILL ◦ Conduit Fill Calculator is FILL. This is derived from the app's title by removing subtitles and symbols.
How much does FILL cost?
FILL offers one free conduit fill calculation. Further calculations require a one-time purchase of FILL Pro for $7.99 (US price, local prices may vary). There are no subscriptions.
Does FILL have ads?
No, FILL does not have advertisements. The app is ad-free, ensuring an uninterrupted experience for users on the job.
What NEC codes does FILL support?
FILL supports both the NEC 2023 and NEC 2026 editions. Users can select the relevant code for their specific job requirements.
What types of conduits and wires can FILL calculate?
FILL supports EMT, RMC, IMC, FMC, LFMC, PVC Schedule 40, and PVC Schedule 80 conduits. Supported wires include THHN/THWN-2, XHHW, RHH/RHW, THWN, TFN, and TFFN.
Can I save my calculations with FILL?
Yes, FILL Pro includes a job history feature. You can save calculations, add area labels, and export them as text. History is stored locally on your device.
What devices is FILL available on?
FILL is available on iPhone and iPod devices. The app is designed for mobile use in the field.
How often is FILL updated?
The latest version of FILL is 1.4.1, last updated on November 4, 2026. Updates typically include support for new code editions and feature enhancements.
