NEC 2026 Electrical Calculator

About NEC 2026 Electrical Calculator

NEC 2026 electrical calculators and code reference for licensed electricians. Conduit fill, box fill, ampacity, voltage drop and conduit bending — calculated offline, on the job.

SPARKIQ answers code questions step by step instead of handing you a blank formula. You pick the wire, then the conduit, then the size — and every result cites the NEC article it came from.

13 NEC CALCULATORS
Conduit Fill (Chapter 9) · Box Fill (314.16) · Ampacity (310.16) · Voltage Drop · Grounding / EGC (250.122) · GFCI & AFCI Finder (210.8, 210.12) · EV Charging (Article 625) · Surge Protection (230.67) · Energy Storage (Article 706) · Solar Rapid Shutdown (690.12) · Dwelling Load (220.82) · Motor (Article 430) · Available Fault Current (110.9)

11 CONDUIT BENDING CALCULATORS
Offset · 3-Point Saddle · 4-Point Saddle · 90 Stub-Up · Back-to-Back 90 · Rolling Offset · Parallel Offset · Concentric 90s · Segment Bending · Box Offset · Kick Bend

Each one is a diagram you can drag, not a static form. Move the obstruction or the stub height and the marks recalculate as you go, so you see where to put the tape before you pull the trigger on the bender.

10 FORMULA TOOLS — TAP, DO NOT TYPE
Ohm's Law · Amps, Watts, HP and kVA · Series and Parallel Resistors · Impedance and Reactance · Power Factor Correction · NEMA Receptacle Configurations · Resistor Colour Code · Unit Conversions · Metals and Resistivity · Transformers

There is no calculate button. Voltages, horsepower and frequencies are buttons, because in this trade those values come from a short list — the keyboard is reserved for what you actually measure. Change one value and the answer moves with it, with the formula written out underneath so you can see where the number came from.

14 REFERENCE TABLES
Ampacity 310.16 · Free Air 310.17 · High-Temp 310.18 and 310.19 · Messenger-Supported 310.20 · Bare and Covered 310.21 · Dwelling Services 310.12 · Ambient Correction 310.15(B)(1) and 310.15(B)(2) · Conductor Types 310.4(1) · Wire Areas Chapter 9 Table 5 · Wire Sizes by Type · Copper to Aluminum Equivalence · Conduit Areas Chapter 9 Table 4 · Grounding 250.122

BUILT FOR THE FIELD
Calculations run entirely on your device — no signal needed in a basement, a tunnel or a new build with no service. Dark mode for low light. One-handed layout. History and Favorites saved on the phone so you can pull up yesterday's pull without redoing it.

ENGLISH AND SPANISH
The entire app is translated, not just the menus. Every question, result and reference table switches with one tap.

WHO IT IS FOR
Journeyman and master electricians, electrical contractors, apprentices, estimators, maintenance techs, and inspectors who need a fast second opinion on a load or a fill.

SUBSCRIPTION
SPARKIQ Premium costs 6.00 USD per month, or 57.60 USD per year (a 20% saving versus monthly). A 7-day free trial is included and you are not charged during it. The subscription renews automatically at the end of each period until you cancel. To avoid a charge, cancel before the renewal date from "Manage Subscription" in the app settings. All prices are in U.S. dollars.

INDEPENDENCE AND SCOPE
SPARKIQ is an independent tool built by working electricians. It is not affiliated with, endorsed by, or approved by the National Fire Protection Association (NFPA), which publishes NFPA 70, the National Electrical Code. "NEC" and "National Electrical Code" are registered trademarks of NFPA.

SPARKIQ is a calculation aid, not a substitute for the code book, engineered drawings, or a licensed professional's judgment. Your jurisdiction may have adopted a different NEC edition or added local amendments. Always verify against the edition adopted where you work and confirm with the authority having jurisdiction (AHJ) before energizing anything.