Load Calculations & Branch Circuits
Dwelling and commercial service load calculators for the NEC 2026 Article 120 renumbering — standard and optional methods, existing-dwelling additions, EV service load, demand factors, panel balancing and branch-circuit planning.
Residential Load Calculator
Calculate single-family and multifamily residential electrical service load using NEC 2026 Article 120 (formerly Article 220) standard & optional methods with 2026/2023 dual citations.
Open calculator NEC 2026 / 2023Existing Dwelling Added Load Calculator
Calculate if new electrical loads (EV charger, heat pump, hot tub) can be added to an existing residential panel without a 200A service upgrade per NEC 2026 §120.83 (formerly §220.83).
Open calculator NEC 2026 / 2023Service & Panel Upgrade Advisor
"Do I need a 200A panel?" — Evaluate if adding an EV charger, heat pump, or induction range requires upgrading your 100A or 150A panel under NEC Article 230 and §120.83.
Open calculator NEC 2026 / 2023Maximum Demand from Utility Data
Calculate electrical service sizing from 12-month utility interval meter data using the NEC 2026 §120.87 (formerly §220.87) 125% peak demand method.
Open calculator NEC 2026 / 2023EV Charger Load Calculator
Calculate Level 2 EVSE dedicated circuit breaker, 125% continuous conductor size, and service calculation demand per NEC 2026 §120.57 and Article 625.
Open calculator NEC 2026 / 2023Commercial Kitchen Demand Load (NEC Table 120.56)
Calculate commercial kitchen cooking equipment demand factors (65%–100%) and the two-largest-unit floor rule per NEC Table 120.56 (220.56).
Open calculator NEC 2026 / 2023NEC General Demand Factor Calculator
Calculate demand factors for general lighting (§120.42), electric clothes dryers (Table 120.54), and cooking ranges (Table 120.55) per NEC 2026 Art. 120.
Open calculator NEC 2026 / 2023Panel Schedule & Load Balancing Calculator
Calculate panelboard phase loads (Phase A/B/C), percentage phase imbalance, neutral current, and bus utilization per NEC §408.4.
Open calculator NEC 2026 / 2023Neutral & Grounded Conductor Sizing
Size feeder and service neutral conductors with 70% unbalance reduction (>200A), range/dryer derates, and harmonic rules per NEC 2026 §120.61.
Open calculator NEC 2026 / 2023Kitchen & Laundry Circuit Planner
Size mandatory 20A small appliance circuits, laundry circuits, garage circuits, and dedicated appliance breakers per NEC §210.11(C).
Open calculator NEC 2026 / 2023Receptacle Spacing Planner (6/12 Rule)
Calculate minimum receptacle outlets, maximum spacing, and layout compliance for rooms, kitchen countertops, and hallways per NEC §210.52.
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