Electrical Load Calc NEC vs NEC Electrical Load Calculator

NEC residential electrical load calculator for electricians, contractors, and electrical engineers. Size electrical services with confidence using the NEC 220.82 Optional Method and updated NEC 2026 Article 120 demand factors. Works 100% offline on the job site. Enter dwelling square footage, pick appliances from presets, and get a permit-ready service-size recommendation in seconds - with a full step-by-step breakdown and NEC article references on every line. Switch between NEC 2023 and NEC 2026 instantly to see how the new rules change your load. LOAD CALCULATION FEATURES: - NEC 220.82 Optional Method for dwelling units - NEC 2026 Article 120 support (load calc sections renumbered 220.x to 120.x) - Toggle between NEC 2023 and NEC 2026 in one tap - Step-by-step breakdown with NEC article references per line - Heating and A/C per 220.82(C): A/C and heat pump compressor at 100%, supplemental heat at 65%, electric space heating at 65% (under 4 units) or 40% (4 or more units) - EVSE per edition: 2023 as general load per 220.57 and 220.82(B) with 7,200 VA minimum; 2026 at 100% per 120.82(D) - Service size from standard ratings: 100A, 125A, 150A, 200A, 225A, 300A, 400A, 600A - PASS/FAIL check against existing panel capacity - 29 common appliance presets with VA ratings - Custom appliance entry for any load - General lighting auto-calculated from square footage per 220.41 - Small appliance and laundry circuits added per 220.52 - HVAC non-coincident load handling (heating vs cooling) - EV charger support (Level 2: 32A, 40A, 48A) APPLIANCE PRESETS INCLUDED: - Electric range and oven (8,000-16,000 VA) - Clothes dryer (5,000-5,500 VA) - Water heater (4,500 VA) - Heat pump (2-5 ton) and central AC (2-5 ton) - Supplemental heat strips (5 kW, 10 kW) for heat pump systems - EV charger Level 2 (7,680-11,520 VA) - Dishwasher, disposal, microwave - Pool pump, hot tub, well pump - And more - or enter custom VA values PRO FEATURES (one-time purchase): - No ads - clean interface for professionals - Save calculation history by job or address - Export permit-ready PDF with full load breakdown - Dark theme support NEC 2026 UPDATES COVERED: - General lighting reduced to 2 VA/sq ft (was 3 VA/sq ft) - First tier demand reduced to 8,000 VA (was 10,000 VA) - EV chargers at 100% demand factor per 120.82(D) - Article 220 relocated to Article 120 (220.82 is now 120.82) HOW IT WORKS: 1. Enter dwelling square footage 2. Select NEC edition (2023 or 2026) 3. Add appliances from presets or custom entry 4. See total demand in amps with NEC article references 5. Get recommended service size instantly NEC ARTICLE REFERENCES: Every calculation line shows the exact NEC article reference (for example "NEC 220.82(B)" or "NEC 2026 120.82(D)"). Verify every step against the official NEC code book, build trust with inspectors, and prep for the electrical exam. PERFECT FOR: - Licensed electricians sizing residential services daily - Electrical apprentices studying for journeyman exams - Electrical contractors bidding residential and light commercial jobs - Electrical engineers and designers - Panel upgrade assessments - EV charger installation planning - New construction load calculations - Permit applications and plan review OFFLINE AND PRIVACY: - Works 100% offline - no internet needed on the job site - No account required - No data collection - your calculations stay on your device - Encrypted local storage for saved jobs Simplify residential load calculations on the job site.

NEC Load Calculator sizes services, feeders, motors, branch circuits, panels and cable tray using the 2023 NEC — and every result shows the article citation, the demand factor table used, and the step-by-step math. Export any calculation as a PDF for permit submission. Built for electricians, electrical contractors, engineers and inspectors who need an answer they can check against the code book — not just a final number. WHAT YOU CAN CALCULATE • Residential service size — dwelling unit load calculation, standard method (NEC 220.40–220.55) and optional method (220.82). General lighting, small appliance and laundry circuits, fixed appliances, dryer, ranges and cooking equipment, HVAC, with 230.79(C) service minimums. • Commercial feeder and service — NEC 220.12, 220.44, 220.60 and 430.24. Lighting, receptacles, motors, HVAC units, sign circuits and demand factors. • Branch circuit wire and breaker size — conductor and OCPD sizing per NEC 210.19, 310.12 and 310.15(B)(1)(a). Continuous loads, conduit fill derating and ambient temperature correction, 120V through 480V. • Motor circuits — conductor, overload and OCPD sizing per NEC 430.22, 430.32 and 430.52, with full motor table lookups by horsepower, voltage and phase. • Panel schedule — circuit-by-circuit panel editor with phase balance, loading percentage and imbalance per NEC 220.40 and 220.87. • Cable tray — tray fill and ampacity derating per NEC 392.22(A) and 392.80(A). Ventilated trough and solid-bottom trays, small-cable fill-area limits and the 90% width rule for large cables. PANEL LAYOUT FROM YOUR LOAD CALC Turn a load calculation into a panel layout: circuit numbers, breaker sizes, two-pole spans and spare spaces, arranged the way a real panelboard is wired. Then fine-tune labels, phase assignment or breaker sizes in the Panel Schedule editor. SHOW YOUR WORK Every result lists the NEC article, the demand table and each step of the math, so you can verify it, explain it to an inspector or teach it to an apprentice. PDF REPORTS Export any result as a PDF for permits, job files or client records. INTERNATIONAL VOLTAGES Supports 220/127V and 440/254V systems (including 127V, 220V, 254V and 440V circuits) alongside standard US voltages, with a reminder to verify against NOM-001-SEDE in Mexico. IPHONE, IPHONE DUO AND IPAD Full-width layouts on iPad and the unfolded iPhone Duo, in any orientation. FREE AND PRO Residential and Branch Circuit calculations are free. A one-time Pro purchase unlocks Commercial, Motor, Panel Schedule, Cable Tray and PDF export. No subscription.