# Voltage Drop NEC Tables 8&9 > NEC voltage drop calculator. Copper & aluminum, feeder sizing. 3% check. Canonical page: [https://chrome-stats.com/d/com.electools.voltage\_drop\_calculator](https://chrome-stats.com/d/com.electools.voltage_drop_calculator) ## Overview - **ID:** `com.electools.voltage_drop_calculator` - **Platform:** Android - **Type:** Android app - **Status:** Available - **Publisher:** ZkDev - **Category:** TOOLS - **Downloads:** 860 - **Version:** 1.1.9 - **Last updated:** 2026-07-23 - **First published:** 2026-02-28 - **Publisher country:** KG - **Size:** 25 MB - **Data as of:** 2026-09-09 - **Store listing:** [Google Play Store](https://play.google.com/store/apps/details?id=com.electools.voltage_drop_calculator) - **Website:** [https://tradetools.dev](https://tradetools.dev/) - **Privacy policy:** [https://tradetools.dev/privacy-policy.html](https://tradetools.dev/privacy-policy.html) ## Description NEC voltage drop calculator for electricians, apprentices, and electrical engineers. Calculate voltage drop instantly using official NEC Chapter 9 data Tables 8 and 9. This electrical feeder sizing calculator supports single-phase and three-phase circuits with copper or aluminum conductors. Works 100% offline on the job site.

Whether you're running a long feeder to a sub-panel or checking branch circuit voltage drop for a commercial project, this voltage drop calculator gives you accurate NEC-compliant results in seconds. Enter your wire length and circuit distance to check voltage loss - use it as your feeder sizing tool for any run length from short circuits to long-distance feeders.

VOLTAGE DROP CALCULATOR FEATURES:
• Single-phase and three-phase voltage drop calculations
• 5 voltage presets: 120V, 208V, 240V, 277V, 480V
• Copper and aluminum conductors: 14 AWG through 1000 kcmil
• 3 conduit types: PVC, Aluminum, Steel — separate AC resistance and reactance per conduit
• NEC Chapter 9 Table 9 effective impedance (Z) at power factor
• Custom power factor support (default 0.85)
• Voltage drop in volts and percentage
• PASS/FAIL indicator based on NEC 3% recommendation
• Recommends minimum wire size to meet 3% voltage drop threshold
• Shows voltage at load end

NEC VOLTAGE DROP REFERENCES:
• NEC 210.19(A) Info Note 4 - Branch circuit: max 3% voltage drop
• NEC 215.2(A) Info Note 2 - Feeder: max 3% voltage drop
• Combined feeder + branch: max 5% voltage drop
• Chapter 9 Table 8 - DC resistance at 75°C
• Chapter 9 Table 9 - AC resistance, reactance, effective Z

PRO FEATURES (one-time purchase):
• No ads - clean interface for professionals
• Save voltage drop calculation history
• Export calculations as PDF reports for permits and records
• Dark theme support

BUILT FOR ELECTRICIANS ON THE JOB SITE:
This voltage drop calculator is designed by electricians, for electricians. Enter your circuit parameters, see voltage drop instantly, and get a recommended wire size - no complicated menus or unnecessary features.

ACCURATE NEC VOLTAGE DROP DATA:
All resistance and reactance values are sourced from NEC Chapter 9. Effective impedance is calculated using Z = R·cos(θ) + XL·sin(θ) per the NEC method. Always verify voltage drop calculations against the official NEC code book before installation.

PERFECT FOR:
• Licensed electricians checking voltage drop daily
• Electrical apprentices studying for journeyman exams
• Electrical engineers and designers
• Electrical contractors bidding commercial and residential jobs
• Long feeder runs and sub-panel installations
• NEC code exam preparation

OFFLINE & PRIVACY:
• Works 100% offline - no internet needed on the job site
• No account required
• No data collection - your voltage drop calculations stay on your device

Simplify your voltage drop calculations on the job site. ## Rankings - #1,199,305 — Overall ## Permissions and access ### Permissions - `android.permission.ACCESS_ADSERVICES_AD_ID` - `android.permission.ACCESS_ADSERVICES_ATTRIBUTION` - `android.permission.ACCESS_ADSERVICES_TOPICS` - `android.permission.ACCESS_NETWORK_STATE` - `android.permission.FOREGROUND_SERVICE` - `android.permission.INTERNET` - `android.permission.WAKE_LOCK` - `com.android.vending.BILLING` - `com.android.vending.CHECK_LICENSE` - `com.electools.voltage_drop_calculator.DYNAMIC_RECEIVER_NOT_EXPORTED_PERMISSION` - `com.google.android.finsky.permission.BIND_GET_INSTALL_REFERRER_SERVICE` - `com.google.android.gms.permission.AD_ID` ## Similar extensions and apps - [ElectricianCalc NEC Calculator](https://chrome-stats.com/d/company.doublevision.electriciancalcpro) — 20 users - [Cable Size Calculator](https://chrome-stats.com/d/com.aistudio.solarcablecalc.wzkqmn) — 62 users - [Wire Size Calculator](https://chrome-stats.com/d/com.k4y.wiresizecalculator) - [Electrician Calculator +](https://chrome-stats.com/d/com.electriciancalculatorplus) — 7 users - [Wire Size NEC 310 Calculator](https://chrome-stats.com/d/com.electools.wire_size_calculator) — 464 users - [NEC Voltage Drop Calculator](https://chrome-stats.com/d/com.necVDFull.lt4kids.necvdfull) — 24 users - [NEC Voltage Drop Calculator](https://chrome-stats.com/d/com.necFREEvd.lt4kids.necvdfree) — 1,342 users - [NEC Electrical Calculator](https://chrome-stats.com/d/com.qiralabs.nec70) — 6 users - [FieldCalc – Voltage Drop Lite](https://chrome-stats.com/d/com.stillherecare.toolkit.electrician_toolkit_lite.electrician_toolkit_lite) — 14 users - [JobVolt: NEC Electrician Calc](https://chrome-stats.com/d/com.jobvolt.app) - [Voltage Drop Calculator](https://chrome-stats.com/d/com.sanca.voltagedrop) — 8 users - [EV Load Calc: NEC Wire & Fill](https://chrome-stats.com/d/com.ali3nstudios.evloadcalc) — 5 users --- Source: [Chrome-Stats](https://chrome-stats.com/d/com.electools.voltage_drop_calculator)