VoltDeck

NEC 2026 calculator and reference for working electricians.

VoltDeck is a code-reference and calculation tool built for licensed electrical professionals working in the field. It is currently an early release.

What’s in it

9 calculators — Voltage Drop · Conduit Fill · Box Fill · Wire Ampacity · Motor Branch Circuit · Three-Phase / Single-Phase · Grounding & Bonding · OCPD (Breaker) Sizing · Dwelling-Unit Service Load.

Reference library — Ampacity (310.16) · Grounding electrode conductor (250.66) · Equipment grounding conductor (250.122) · Conductor properties (Ch. 9 Table 8) · Raceway fill (Ch. 9 Tables 1, 4, 5) · Color codes · Working clearances (110.26) · Standard OCPD ratings · Box volume + conductor allowance.

Jobs — group calculations by site or project. Saved results are an immutable audit trail. Optional iCloud sync across your iPhone, iPad, and Mac.

NEC editions — NEC 2026 at launch. Support for older editions (2017, 2020, 2023) may be added later as free updates if there is enough user demand and the citations can be verified against the NEC text. No older edition is guaranteed.

Designed for the field

Big tap targets, glove-friendly
High contrast, readable in direct sunlight
Works fully offline — no signal, no problem
No accounts, no ads, no tracking, no data collection

Pricing

Free — 3 calculators (Voltage Drop, Wire Ampacity, OCPD), full reference library, 3 saved jobs
Pro — all 9 calculators, unlimited jobs, every NEC edition supported in v1.x
- $39.99 lifetime (one-time)
- $14.99 / year (subscription)

Important

VoltDeck is an early release. Calculations have not been independently audited or certified. Verify every result against another calculator, hand calculation, or the NEC text before relying on it. Obtain AHJ approval for any installation that depends on a VoltDeck calculation. See the full disclaimer.

Get the app

iOS — [App Store link coming soon]
Android — planned for a later release

Pages

Support — FAQ and contact
Privacy Policy
Disclaimer

VoltDeck references the National Electrical Code® (NEC®) and NFPA 70®, both registered trademarks of the National Fire Protection Association (NFPA), Quincy, MA. VoltDeck is an independent product and is not affiliated with, endorsed by, or sponsored by NFPA.