Residential Service Headroom Calculator
Estimate residential service headroom before a planned load by comparing entered service capacity, existing peak demand, planned added load, and an entered coincidence factor.
Open calculatorResidential Load And Service
Dwelling load, panel load, service size, NEC 220 demand, EV charger, heat pump, and generator load calculators.
Published Calculators
Residential Heat Pump Service Load Calculator
Estimate the net added kW from a residential heat-pump conversion and compare the planned peak load with available service capacity.
Open calculator
Residential Generator Load Calculator
Estimate preliminary residential generator kW and kVA for selected outage loads, including motor-start allowance, reserve factor, power factor, and margin against an entered generator rating.
Open calculator
Residential EV Diversity Load Calculator
Estimate connected and diversified residential EVSE load, then compare the planning load with an entered capacity allowance.
Open calculator
Residential Battery Load Calculator
Estimate residential backup battery energy, energy margin, inverter margin, and runtime from essential load, backup duration, efficiency, reserve, and entered equipment ratings.
Open calculator
Range Demand Calculator
Estimate connected range load, demand load, diversity allowance, and effective demand factor from entered range loads.
Open calculator
Panel Capacity Calculator
Estimate a panel load screen from existing and planned current, then compare it with an entered panel rating and reserve target.
Open calculator
Optional Method Dwelling Load Calculator
Keep row-level dwelling load arithmetic visible while preserving the entered method and source records for qualified review.
Open calculator
Dwelling Pool Equipment Load Calculator
Compare entered pool equipment loads with panel or service capacity while keeping Article 680, bonding, grounding, and protection review separate.
Open calculator
Dwelling Load Schedule Calculator
Compare entered dwelling load schedule groups with an entered capacity while keeping NEC method selection and service sizing separate.
Open calculator
Dwelling Hot Tub Load Calculator
Compare entered hot-tub component loads with entered circuit capacity while keeping protection, bonding, and manufacturer review separate.
Open calculator
Dwelling Detached Structure Load Calculator
Calculate entered detached-structure load, planned load with spare, and feeder-capacity margin from lighting, receptacle, equipment, and HVAC values.
Open calculator
Dwelling Garage Load Calculator
Compare entered garage load with panel or service capacity and show the EV allowance share of the entered total.
Open calculator
Dwelling Addition Load Calculator
Calculate added connected load, entered-coincidence planned peak, and service-capacity margin from dwelling addition values.
Open calculator
Residential Well Pump Duty-Point Power Calculator
Enter flow, total dynamic head, and pump/motor efficiency for a duty-point power review. The result does not select a pump curve or guarantee pressure.
Open calculator
Residential Well Pump Electrical Load Calculator
Enter nameplate or measured running-current data to review a private-well pump's operating electrical load. The result is not a pump selector or final circuit-sizing value.
Open calculator
Residential Panel Phase Balance Calculator
Enter residential panel branch-circuit assignments and load currents for a preliminary 120/240 V or 120/208 V distribution review.
Open calculator
Residential Electrification Load Scenario Calculator
Compare a defined package of heat-pump, water-heater, induction, dryer, EV, or other electrification changes against entered planning capacity. No equipment database is assumed.
Open calculator
Dwelling Small Appliance Load Calculator
Builds a dwelling small-appliance load line from circuit count, entered VA allowance, demand factor, and any existing appliance rows needing duplicate-entry review.
Open calculator
Dwelling Water Heater Load Calculator
Review residential water-heater connected and assessed current for tank, tankless, or heat-pump equipment using entered nameplate or rated-power data.
Open calculator
Dwelling General Lighting Load Calculator
Calculate a dwelling general-lighting load from floor area and an entered VA-per-square-foot basis, with an optional documented override.
Open calculator
Dwelling HVAC Load Calculator
Compares dwelling cooling, heating, and auxiliary-heat inputs as current values for preliminary service planning before equipment-specific MCA/MOCP review.
Open calculator
Subpanel Load Calculator
Estimates demand load, feeder current, subpanel utilization, and spare capacity from connected load, an explicit demand factor, system voltage, phase, panel rating, and target margin.
Open calculator
Service Upgrade Calculator
Compares projected demand, service utilization, spare capacity, and headroom margin from an existing service rating, calculated demand, added load, and explicit planning target.
Open calculator