JobVolt: NEC Electrician Calc

The wire size you submit is only right if the math behind it is right. JobVolt
is the electrical calculator built for electricians who answer to an
inspector: an NEC calculator where every table is
independently verified against NEC 2023 and 2026, every result shows its full
derivation, and every report you send looks like it came from an engineer.

CALCULATIONS THAT SHOW THEIR WORK
- Wire Size and ampacity per Table 310.16, from 14 AWG to 1000 kcmil, with
ambient correction, conductor adjustment, terminal limits 110.14(C), NM
cable (Romex) caps, parallel runs and the 83% dwelling rule
- Voltage Drop per Chapter 9 Table 8, single and three phase
- Conduit Fill per Chapter 9 Tables 1, 4 and 5, with jam ratio warnings
- Box Fill per 314.16 with device, clamp and ground allowances
- Dwelling load calculation per 220.82 for service and panel sizing, with EV
charger and heat pump loads, NEC 2026 ready including the new 2 VA rule and
Article 120 renumbering
- Motor FLC, conductor, OCPD and overload per Article 430
- Grounding: EGC per 250.122 and GEC per 250.66, with upsizing
- Ohm's Law and power triangle

Tap Why on any result and see every step with its code section. Tap the code
chip and the NEC table opens with your row highlighted.

REPORTS AN INSPECTOR TAKES SERIOUSLY
Combine calculations into a multi-page PDF submittal: your company name,
license and logo on the letterhead, a summary index, full code citations and
a certification block with signature lines. Six templates, from city permit
submittal to client-ready service report. Checked against real county
worksheet formats.

BUILT FOR THE JOB SITE
Works fully offline. No account. No ads. Every calculation saves to History
automatically. Free NEC edition updates, including 2026.

FREE VS PRO
Free: five calculators, one report with six blocks, the Submittal template.
Free reports carry a small JobVolt line in the footer.
Pro unlocks Load Calc, Motor and Grounding, unlimited reports and blocks,
all six templates and your logo on the letterhead. Monthly, annual with a
free trial, or one-time Lifetime.

Found a number you disagree with? Tap "Report a discrepancy" inside any
calculator. A person answers, checks the code and fixes it if we are wrong.

SUBSCRIPTION DETAILS
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NEC and National Electrical Code are registered trademarks of the National
Fire Protection Association. JobVolt is not affiliated with the NFPA.