Can this tell me if I need a service upgrade?
It gives you a strong planning estimate. If the calculated demand lands above your existing service size, that is a sign the project likely needs closer review before construction.
Find out if your home may need a service upgrade.
Use this homeowner-friendly calculator to estimate electrical demand for a detached single-family home before a renovation, home purchase, or new construction decision.
If you are asking whether a 100 amp service is enough, whether an EV charger will fit, or whether a renovation may trigger a panel or service upgrade, this calculator gives you a practical starting estimate using public Canadian code guidance.
Popular planning paths
Choose the scenario that matches your next move.
Service Upgrade Planning
Use the calculator to estimate whether your current service may be undersized for the loads you want to add.
Renovation Planning
Use the calculator to estimate whether your renovation, addition, or basement project may push the home toward a service upgrade.
Home Buyer Planning
Use the calculator to compare a home's likely capacity against the loads you may want after you move in.
New Construction Planning
Use the calculator as an early-stage check before finalizing the major loads and service expectations for a new build.
Calculator
Estimate your likely electrical service demand.
FAQ
Common questions before you start.
Who is this calculator for?
It is built for detached single-family home owners, buyers, renovators, and early-stage project planners who want a simple demand estimate before they speak with an electrician, designer, or permit office.
What information do I need before I start?
You will get the best result if you know the home size used for service sizing and the nameplate ratings for major loads such as the range, electric heat, dryer, EV charger, and hot tub or spa equipment.
Is this a stamped engineering calculation?
No. It is an informational planning tool only. Final permit and construction decisions still need to be reviewed by the authority having jurisdiction and, where required, a qualified professional.