Electrical Load Calculator
Full CEC 8-200 residential load calculation with transparent demand factors, service OCP and 75°C conductor sizing — plus automatic City of Calgary and Edmonton form PDFs.
Open the calculator →Free tools for Alberta electricians & homeowners
Free Electrical Load Calculator for Calgary & Edmonton Permits
Find out in minutes whether your electrical service can handle a secondary suite, EV charger, or hot tub — then auto-fill the official City of Calgary or City of Edmonton load calculation form, ready for your permit.
CEC Rule 8-200 demand factors
Auto-fills official city PDFs
Built by a Calgary master electrician
Doing the work yourself?
You can't sign your own load calculation.
Pull the permit, do the install — but the calculation still needs a master electrician's signature before the City will accept it. Book one online by video, usually done in under an hour.
Online from $120
In-home from $250
Calgary & area
The toolbox
Smart planning tools for electricians and service experts.
Real World Electric is building a suite of free, code-aware tools for Alberta's electrical trade. The load calculator is live today — more are on the bench.
Voltage Drop Calculator
Size feeders and branch circuits for distance with CEC-based voltage drop checks for copper and aluminum conductors.
More trade tools
Conductor & breaker sizing, EVEMS load management checks, and more. Have a tool you wish existed? Tell us and we'll build it.
When you need it
Know your service capacity before the inspector asks.
These are the projects where Calgary and Edmonton most often require a documented load calculation.
Secondary suites
Estimate combined demand for the main dwelling and basement suite before Calgary's required load calculation form is due at rough-in.
Laneway & backyard suites
Check whether the existing service can carry an added dwelling unit, or whether you're looking at a service upgrade.
Garden suites (Edmonton)
Prepare Edmonton-style garden suite load details for detached suite planning and permits.
EV chargers
See how an EVSE at 100% demand affects your calculation and whether load management (EVEMS) could avoid an upgrade.
Hot tubs & spas
Count the full nameplate load and understand the service impact before the tub shows up on a truck.
Service upgrades
Document existing demand on a 60, 100, or 200 A service and prove whether an upgrade is actually needed.
Guides
Load calculations, explained by a master electrician.
Plain-language answers to what Calgary homeowners and electricians actually ask — the City forms, the demand factors, and the projects that trigger a calculation.
Calgary secondary suite load calculation
What the City requires, when the form is due, how Rule 8-200 demand factors work across two dwelling units, and what to do if you come up short.
Read the guide →Can a 100 A service handle a secondary suite?
More often than people expect. Which loads actually decide it, and three options worth trying before you pay for a service upgrade.
Read the guide →The City of Calgary form, explained
A field-by-field walkthrough — where to get the current version, how each section is filled in, and the mistakes that get a submission bounced.
Read the guide →EV chargers & EVEMS in Calgary
Why EV charging counts at 100% with no diversity, and how load management can keep you on your existing service instead of upgrading it.
Read the guide →How it works
Three steps from loads to a permit-ready form.
Transparent math — every demand factor is shown so the result is easy to trust, explain, and defend at inspection.
1
Enter your project
Pick Calgary or Edmonton, add dwelling areas, suites, and connected loads — range, heat, A/C, EV charger, hot tub, tankless heater.
2
Get the full calculation
CEC Rule 8-200 demand factors applied line by line, with calculated amps, service OCP, and 75°C conductor sizing.
3
Download the city form
Generate a completed City of Calgary or City of Edmonton load calculation form PDF — no duplicate typing.
- Basic dwelling area load
- Secondary suite and laneway suite demand factors
- EV charging equipment at 100%
- Range, tankless water heater, hot tub, and additional loads
- Heating and cooling interlock handling
- Service OCP and 75°C conductor sizing
Automatic city form PDFs
The official load calculation form, filled out for you.
After you run the calculation, the app generates a completed city load calculation form PDF from the same data — so the submitted form always matches the math.
Calgary load calculation form
Built for Calgary residential permit planning — single family dwelling, secondary suite, and laneway or backyard suite details straight from the calculator.
- Dwelling and suite address fields
- Permit EP number fields where applicable
- Calculated load values and demand summary
- Service breaker and conductor sizing
Edmonton load calculation form
Supports Edmonton residential workflows — primary dwelling, secondary suite, and garden suite load calculation categories.
- Primary dwelling, secondary suite, and garden suite addresses
- Heating, A/C, range, water heater, hot tub, and EV load rows
- Calculated total watts and amps
- Main breaker and service conductor cells
Need sign-off or help?
Run the free calculator, then get a master electrician's signature.
If the result is close to your service limit, confusing, or headed to the City with a permit — Real World Electric can complete the calculation with you and sign it. Online from $120, in-home in the Calgary area from $250.
Common questions
Calgary & Edmonton load calculation FAQ
When does Calgary or Edmonton require an electrical load calculation?
A load calculation is commonly required when you add a secondary suite, laneway or garden suite, EV charger, hot tub, or other major load, or when you upgrade the electrical service. Calgary asks for its secondary suite load calculation form before the electrical rough-in inspection, and Edmonton has an equivalent load calculation form.
Is the electrical load calculator free?
Yes. The calculator is completely free to use, including the automatic City of Calgary and City of Edmonton form PDFs. If you need help interpreting the result or preparing for permit review, Real World Electric offers a master electrician review.
Can a 100 amp service handle a secondary suite or EV charger?
Sometimes. It depends on the calculated demand under CEC Rule 8-200. Many homes can add a suite or EV charger on a 100 A service once demand factors are applied, while others need load management or a service upgrade. The calculator shows you where you stand in minutes.
Can it fill out the official City of Calgary and City of Edmonton load calculation forms?
Yes. After you run the calculation, the app generates a completed City of Calgary or City of Edmonton load calculation form PDF using your project addresses, dwelling units, calculated watts and amps, breaker size, and conductor size.
Does the calculator replace a permit submission?
No. It helps you estimate and document the electrical load before you apply. Permit requirements and final acceptance always depend on the authority having jurisdiction and your specific project.
What if my calculated load is above my current service size?
You may need load management (such as an EVEMS for EV charging), revised equipment choices, or a service upgrade. Real World Electric can review the calculation and walk you through the options before you spend money on a permit.