Volt Drop Check & Plug-E

iPhone only

Every electrical calc you need, in one iPhone app.

Voltage drop, cable sizing, ampacity, breaker selection, power conversion, and a NEMA/IEC plug reference — a fast, beautiful toolkit for field electricians and engineers.

Open on the App Store View tools

iPhone only · Japanese & English UI

What's inside

Six built-in tools you can switch between with a single tap. Designed for real jobsite decisions.

VD

Voltage Drop Calculator

Enter voltage, current or power, length, conductor material, insulation, circuit type, power factor, and optional reactance. See voltage drop, drop percentage, terminal voltage, loop resistance, assumed conductor temperature, and a clear verdict.

CS

Cable Size Selection

Reverse-calculate the optimal conductor area from load current, voltage, distance, and allowable drop percentage. A side-by-side size comparison marks PASS, FAIL, and BEST at a glance.

A

Ampacity Calculator

Pick material, size, installation method, insulation, ambient temperature, and grouping count to see base and corrected ampacity, with a per-method summary.

BR

Breaker Selection Guide

From circuit current, voltage, usage, and phase, get a recommended AT rating, frame size, and type such as MCCB, MCB, or ELCB, with ELCB guidance when appropriate.

P

Power Calculator

Convert between W, VA, kVA, var, kvar, and phase angle using three input modes. Single-phase and three-phase calculations are supported.

PL

NEMA / IEC Plug Reference

A searchable reference for plug and connector types, useful for overseas sites, imported equipment, and quick field checks.

Why it helps

• Stop juggling paper tables, calculators, and spreadsheets on site.
• Instantly check whether voltage drop is within target, with suggestions to improve it.
• Right-size cables from a few inputs, avoiding over- or under-sizing.
• Visualize ampacity including temperature and grouping corrections.
• Pick breaker rating, frame, and type with guided recommendations.
• Convert between W, VA, kVA, var and read the phase angle in seconds.

Made for

Field electricians & contractors

Facility / maintenance technicians

Plant & building services engineers

Solar, storage & EV charging designers

Teams working with imported gear

Electrical students & trainees

Thoughtful details

JA / EN toggle

Switch languages with one tap in the header. Your choice is remembered.

Works offline

Calculations run on-device, reliable even with poor signal.

Clear results

Inputs and results are clearly separated, with verdict badges and plain-language notes.

iPhone-first UX

Tab layout and input controls tuned for one-handed use.

Get Volt Drop Check & Plug

Open the official App Store page and install it directly on your iPhone.

Open on the App Store

App link: https://apps.apple.com/us/app/volt-drop-check-plug/id6752117109

© Volt Drop Check & Plug

Results are reference values based on generic targets. Always follow your local codes, internal standards, and equipment specifications for actual design and installation.