All electrical calculators are built to the Canadian Electrical Code (CEC). Use these tools to size wire, breakers, and service panels for residential and commercial projects in Canada.
Wire Size Calculator
CEC Table 2What size wire do I need? Enter amps, voltage, and run length — get the correct AWG based on CEC Table 2.
Open calculatorCircuit Breaker Sizing Calculator
CEC Rule 14-104What size breaker do I need? Select your appliance or enter wattage to get the correct breaker size per CEC Rule 14-104.
Open calculatorElectrical Load Calculator
CEC Rule 8-200How many amps does my house need? Calculate total residential load and required service size per CEC Rule 8-200.
Open calculatorVoltage Drop Calculator
CEC Rule 8-102Am I losing voltage over distance? Calculate voltage drop and check against the CEC 3% branch circuit limit.
Open calculatorHot Tub Electrical Calculator
CEC Rule 68-064What breaker, wire size, and GFCI do I need for a hot tub? CEC Rule 68-064 requirements for 30A to 60A hot tub circuits.
Open calculatorPanel Upgrade Calculator
CEC Rule 8-200Do I need a 200 amp service? Calculate your home's total electrical load using CEC Rule 8-200 before adding an EV charger, hot tub, or electric heating.
Open calculatorCanada's electrical standard is the Canadian Electrical Code (CEC C22.1), not the US National Electrical Code (NEC). The two differ in wire sizing tables, circuit protection rules, and service calculation methods — which means US-based tools give wrong answers for Canadian projects. Every calculator here applies the CEC directly.
Residential electrical work in Canada most commonly requires three calculations: wire sizing (CEC Table 2 ampacity, adjusted for conduit fill and temperature), circuit breaker sizing (CEC Rule 14-104, based on continuous vs non-continuous load), and service load (CEC Rule 8-200, which sets the minimum service size for the whole dwelling). A fourth calculation — voltage drop — is required whenever a circuit run exceeds roughly 30 metres; the CEC limits branch circuit voltage drop to 3% under Rule 8-102.
Common triggers for these calculations include new home construction, service panel upgrades driven by EV charger or heat pump additions, hot tub and pool circuits, and accessory dwelling unit (ADU) wiring. In Ontario, a load calculation is required by the Electrical Safety Authority (ESA) before a 200A service upgrade is approved.
These tools are used by homeowners preparing permit applications, electricians doing quick field checks, and contractors verifying service capacity before quoting a job. All results cite the specific CEC rule applied so you can reference it directly in your permit submission.
Read our guide: Best Load Calculators for Canadian Electricians →