The electrician's calculator that works where the job is.

Quick answers in the browser, same engine as the app.

• NEC Ch. 9

  Conduit Fill

  How many wires fit in this pipe? →
• NEC 210.19(A)

  Voltage Drop

  Is this run too long for the wire? →
• NEC 310.16 · 110.14(C)

  Wire Size

  What size wire for this load and distance? →
• NEC 314.16

  Box Fill

  Is the box big enough for the splice? →
• Bend geometry

  Conduit Bending

  Offset, stub and saddle marks in sixteenths →
• NEC 250.122 · 250.66

  Grounding

  Ground wire size, including upsizing →

Why electricians use Voltkit

• No signal needed

  The math runs on the phone, so a basement electrical room or a site with no bars doesn't stop you.

• Tables checked cell by cell

  Values checked against the printed NEC 2023 tables. Chapter 9, 310.16, 250.122 and the rest were compared against the book one value at a time, and each is locked by a test.

• Shows the section and the steps

  Each result names the section it came from and opens the arithmetic behind it, so you can show the inspector how you got there.

• 3 Point Saddle Bend: Layout, Multiplier and Shrink (Plus the 4-Point Saddle)

  NEC 2023 · Oct 20, 2026

• How Many 12 Gauge Wires in 3/4 Conduit? Conduit Fill Worked Examples (NEC Ch. 9)

  NEC 2023 · Oct 20, 2026

• How to Calculate Box Fill, Step by Step (and Do Grounds Count?)

  NEC 2023 · Oct 20, 2026