№Tool · Panel Amperage Calculator
What service size does your house really need?
* A two-minute calculator built on Ontario Electrical Safety Code Rule 8-200 — the same load calculation your electrician runs before quoting a panel upgrade.
What's your current main panel size?
The amperage printed on your main breaker — usually 100 A or 200 A on newer homes, 60 A on older ones. Pick "Not sure" and we'll skip the comparison at the end.
How do I find my panel size?
The wide switch at the top (copper) is your main breaker.
- Find your panel — usually in the basement, garage, utility room, or a hallway closet. It's a grey metal door.
- Open it. The biggest switch — often alone at the top or side — is the main breaker.
- The number stamped on it (60, 100, 125, 200) is your panel size. Can't find it? Pick Not sure — we'll confirm from the photos you send.
Answer above to continue.
Running TotalStep 1 / 7
Estimated load
0A
0 W ÷ 240 V
- 1Current panel
- 2Living area
- 3Electric range
- 4Water heater & pool
- 5EV chargers
- 6Space heating & A/C
- 7Other loads
Estimated load
0A
Step
1 / 7