FieldCalc – Voltage Drop
Voltage Drop • Conduit Fill • Box Fill
Features Screens FAQ
Google Play Pro App Store Pro Google Play Lite App Store Lite
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No subscription One-time purchase. Yours forever.

Fast answers on the job — not in the office.

Built for electricians who need a clean, reliable calculator in the field: Voltage Drop, NEC Conduit Fill (PASS/FAIL), NEC Box Fill (required volume), and Save Projects.

Get Pro on App Store Get Pro on Google Play See real screenshots
Lite is free (no Saved Projects, no Conduit Fill, no Box Fill). Same Voltage Drop + core tools.
Get Lite (iOS) Get Lite (Android)
Pure HTML/CSS/JS — host it anywhere (GitHub Pages, Netlify, Cloudflare Pages).
Voltage Drop quick presets screenshot Voltage Drop — quick presets
Conduit Fill PASS summary screenshot Conduit Fill — PASS/FAIL
Box Fill required volume screenshot Box Fill — required volume
Save project screenshot Save Projects — per job

Two versions. Same field-ready feel.

Start with Lite (free). Upgrade to Pro when you need saved jobs + NEC helpers.

PRO

FieldCalc – Voltage Drop Pro

  • Voltage Drop (single & 3-phase, copper & aluminum)
  • Conduit Fill (PASS/FAIL) + details
  • Box Fill helper (required volume)
  • Saved Projects (store jobs, favorites)
  • One-time purchase (no subscription)
Pro on App Store Pro on Google Play
LITE

FieldCalc Lite (Free)

  • Voltage Drop (single & 3-phase, copper & aluminum)
  • Quick presets + fast inputs
  • No Saved Projects
  • No Conduit Fill / Box Fill
  • Free download (upgrade anytime)
Lite on App Store Lite on Google Play
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What you get

Focused tools. No fluff.

Voltage Drop (single / 3‑phase)

Quick presets + clean results you can read at a glance.

Conduit Fill PASS / FAIL

See fill %, allowed limit, and key areas — fast.

Box Fill required volume

Count equivalents and get required cubic inches quickly.

Save Projects per job

Keep calcs organized for later reference or sharing.

Imperial / Metric

Switch units when the job calls for it.

No subscription

One‑time payment. No monthly surprises.

Real app screenshots

Tap any image to zoom.

Voltage Drop screenshot
Conduit Fill inputs screenshot
Conduit Fill PASS summary screenshot
Box Fill result screenshot
Save Projects screenshot
Home screenshot
Open in App Store Open in Google Play

FAQ

Short answers, like on the job.

Is this a subscription?

No — it’s a one‑time purchase for Pro.

Does it support 3‑phase voltage drop?

Yes — there’s a three‑phase option in Voltage Drop.

Is this official code guidance?

It’s a reference tool. Always verify with your local code / AHJ.

Can I switch Imperial / Metric?

Yes — switch units in Settings.