Kopperfield vs VoltForge

Save time and money. Get ready for permits and projects with faster and easier design tools from Kopperfield, including load calcs, line diagrams, panel schedules, and more. Once logged into your Kopperfield account, you'll enjoy our: * Load calculator: Easy-to-use interface pre-loaded with common appliances and their standard output values from the National Electrical Code. Add information on the property and your calculation will automatically update. Supports both commercial and residential calculations, as well as the Standard (NEC Article 220 Part III), Optional (NEC Article 220 Part IV), and 2026 Standard (NEC Article 120 Part III) methods. * Single line diagram tool: Contains dozens of common templates and electrical symbols to make it easy to generate new diagrams and share them with your team. View diagrams from any device and create new templates on tablet or desktop for your whole team to use. * Panel schedules: Includes tools to complete panel schedules and create labels for electrical panels. Drag-and-drop interface makes it easy to arrange and customize circuits for both split-phase and three-phase projects. * NEC chatbot: Custom chatbot with advanced search capabilities to quickly reference specific sections of the 2017, 2020, or 2023 National Electrical Code. Includes the following features: * Fast PDF outputs: instantly generate a downloadable, one-page PDF report of your load calc, line diagram, or panel schedule to share with inspectors and customers * Smart property data: enter the property address and we’ll pull in the square footage for any customer project or electrical load calculation * AI panel photo processing: upload a photo of an electrical panel to automatically add items to your load calculation or panel schedule * Team dashboard: store your team's projects and documents in one place for easier management, access, and review *Single and three phase options: use a variety of nominal voltages for residential and commercial building types, including: 120/240V, 120/208V, 120/240V, 208Y/120V 3Ø, 240V 3Ø Delta, 240V 3Ø Hi-leg Delta, 347V 3Ø Delta, 480Y/277V 3Ø, 480V 3Ø Delta, 600Y/347Y 3Ø, 600V 3Ø Delta. * Standard scenarios: generate load calcs for scenarios including single family homes (standard and optional methods), multi dwelling units (i.e., duplex, triplex, quad), 120/208v (three-phase power) dwellings, accessory dwelling units and additions, commercial occupancy types, and heat pumps * Common appliance defaults: choose from a pre-loaded list of common appliances and standard output values that you can adjust for every load calculation * EV charger inputs: include EV charger values to any load calculation, essential for modern homes

Built for the field, not the classroom. VoltForge puts precision calculators, NEC 2023 code references, and a professional job estimator in your pocket. Built for journeymen, master electricians, and apprentices who need fast, accurate answers on the job site. Launch pad home screen. Light and dark mode. Large tap targets. Fully offline. No ads. No subscriptions. FREE TOOLS OHM'S LAW & VOLTAGE DROP Solve for any value from any two inputs. Voltage drop supports 1-phase and 3-phase, copper and aluminum, 14 AWG to 500 kcmil, 120V to 600V. Auto-suggests correct wire size when over NEC 3% limit. Includes 3-phase kVA, kW, kVAR, and HP calculator. FRACTION CALCULATOR Tap-style keyboard with denominators from halves to 64ths. Add, subtract, multiply, and divide. Displays fraction and decimal simultaneously. WIRE AMPACITY TABLE NEC Table 310.15(B) for copper and aluminum, 14 AWG through 1000 kcmil. Includes derating calculator for conductor count and temperature correction table. PRO TOOLS - One-time $4.99, yours forever CONDUIT BENDING CALCULATOR All six bend types: 90 Stub, Back-to-Back, Offset, 3-Point Saddle, 4-Point Saddle, Rolling Offset. Enter measurements in feet and inches. Marks display in feet and fractions to the nearest 1/8". EMT 1/2" through 4". CONDUIT FILL CALCULATOR EMT, IMC, RMC, PVC 40/80, HDPE, LFMC up to 4". THHN/THWN, XHHW, RHH/RHW-2, THW/THHW up to 1000 kcmil. Shows fill %, jam ratio per NEC Ch.9, and ampacity derating warning for 4+ conductors. WIRE PULL TENSION CALCULATOR Build your pull route segment by segment. Calculates cumulative tension through straights and bends. Flags sidewall pressure violations. Pass/fail result with remedies when over limit. TRANSFORMER WIRING DIAGRAMS 7 configurations with schematic diagrams and field notes: 1-Phase 120/240V, 1-Phase 480V Step-Down, Delta-Wye, Wye-Delta, Delta-Delta, Wye-Wye, and Open Delta. Terminal reference and NEC field notes for each. NEC QUICK REFERENCE 20 searchable NEC 2023 sections: Working Clearances, Box Fill, GFCI, AFCI, Breaker Sizing, Feeder Sizing, Grounding, Service Entrance, Conduit Fill, Load Calculations, Motor Calculations, Panelboard Rules, Transformers, Torque Specs, and more. JOB ESTIMATOR + PDF EXPORT Material list with markup, labor, permit fee, and tax. Generates a professional PDF with company info, customer details, scope of work, line items, and signature blocks. Share via email, AirDrop, or any iOS share sheet. WHY VOLTFORGE - NEC 2023 - current code, not years-old data - Light and dark mode - tap to switch on the home screen - Fully offline - works anywhere, no signal needed - Fraction and feet/inches input - built for how electricians measure - No ads, no subscription - Pro is one purchase, forever - Large tap targets for gloved hands All calculations are for planning purposes. Always verify with your local AHJ.