Electrical Planning Made Simple

ZapSketch helps electricians, engineers, and DIY enthusiasts create accurate, NEC-compliant electrical plans that save time and materials.

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Free Voltage Drop Calculator

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Our precision-engineered calculator helps you quickly determine voltage drop, minimum wire gauge, and maximum circuit distance for your electrical projects.

NEC-compliant calculations
High precision using Decimal.js
Support for AC/DC, 1-phase, 3-phase, copper, aluminum, and more

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Powerful Features

ZapSketch combines precision electrical calculations with intuitive planning tools to revolutionize how you design electrical systems.

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Voltage Drop Calculator

Calculate voltage drop based on wire gauge, length, and load with NEC-compliant precision. Our calculators also determine minimum conductor size and maximum circuit distance.

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Coming Soon

Homerun Planner

Interactive diagram editor to add and connect components with automatic layout following electrical design principles. Currently in development.

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Coming Soon

Easy Sharing

Share diagrams with electricians on jobsites through mobile-friendly links and QR codes. Part of our upcoming Homerun Planner.

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Get Early Access Today

Join our waitlist now and receive 25% off your first 3 months when we launch. Be the first to experience the full power of ZapSketch.

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Instant access to our voltage drop calculator

Priority access to homerun planner beta

Early access to new features and updates