Residential Electrical calculator
Residential Load Calculator
Use this residential load calculator as an input-led dwelling service screen. Enter floor area, small-appliance and laundry circuit counts, service voltage, range, dryer, water heater, heating and cooling, other fixed loads, and EV demand basis. The result panel compares the general demand load, controlling climate load, total demand, service current, and practical service-size review without treating one example as the answer for every home.
Updated July 16, 2026
Use this one dwelling service screen by entering floor area, small-appliance and laundry circuit counts, service voltage, range, dryer, water heater, heating or cooling, other fixed loads, and EV demand basis before choosing a service size.
Method path: build the general load bucket, apply the dwelling demand reduction, add the modeled major loads, keep the larger HVAC load, then convert the demand to service current.
Enter one-dwelling area, circuits, service voltage, and major electric loads below to screen service demand and a practical next service size
Calculator Inputs
Calculation Results
Enter values above to see calculation results
Field kit
Tools for load documentation
Use the load result as a planning screen, then compare tools for field readings and panel notes.
Compare clamp metersFor measured loadsOpens in a new tabAdd panel schedulesFor load notesOpens in a new tab
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Calculation history
Example Calculations
How to Use
What this residential load calculator actually models
This page is a dwelling service-load screen, not a permit package and not a full optional-method worksheet. It stays focused on one practical workflow that many electricians still mean when they talk about an "Article 220" residential load check: apply the familiar dwelling general-load reduction, add the modeled single-household appliance screens, choose the larger of heating or cooling, and convert the total demand to service current.
Modeled basis used by the calculator
| Modeled item | Screen used here | How to read it |
|---|---|---|
| General dwelling load | 3 VA/sq ft + 1500 VA small-appliance circuits + 1500 VA laundry circuits | The general-load bucket is reduced with the familiar 100% first 3 kVA and 35% remainder screen. |
| Single household range | 8 kW demand up to 12 kW nameplate | Above 12 kW the calculator applies a simplified 5% per kW adder for a quick range screen. |
| Single dryer | Entered nameplate or 5 kW minimum | Useful for a quick single-dryer service-load check. |
| Heating vs cooling | Only the larger noncoincident load counts | Enter both if you want to compare them; the result keeps only the larger one. |
| Other fixed loads and EV charging | 100% of the entered demand basis | Grouped appliance allowances and project-specific EV management methods are not modeled in this bucket. |
Why the page is framed as a screen, not a universal code worksheet
Residential load calculations are highly sensitive to the adopted NEC edition, local amendments, and the exact method your jurisdiction expects. That is why this page does not claim to replace a permit worksheet for every project condition. Instead, it gives you a clean, explainable dwelling-demand screen that is useful for early service planning, upgrade discussions, and quick scope checks before you move into jurisdiction-specific documentation.
When another residential tool owns the question
- Use the NEC Table 220.55 Column C Calculator for multiple household ranges, apartment cooking loads, NEC Table 220.55 Column C values, or 3-phase, 4-wire range-demand questions. Use that worksheet instead of forcing multiple ranges into the single-range input on this page.
- Use the Electrical Service Size Calculator when the main question is the next common service size for one dwelling unit.
- Use the Electrical Panel Load Calculator after the service-load assumptions are known and the question becomes panel utilization, spare amperes, or 80% planning headroom.
- Use the Electrical Load Calculator when the scope is no longer one dwelling and you need a mixed-scope preliminary load screen for dwelling comparisons, light-commercial connected loads, or workshop planning.
How to use the result
- Enter the dwelling area, small-appliance circuits, and laundry circuits.
- Add the major electric loads that actually matter for the dwelling service screen: range, dryer, water heater, heating, cooling, and any other fixed loads.
- If EV charging is part of the project, enter the EV charging demand basis you want screened.
- Review the general demand load, total demand load, service current, and the recommended service size.
- Use the result as a planning screen, then confirm the adopted code edition and any local worksheet requirements before final design or permit submission.
Typical ways electricians use this page
- Checking whether a planned all-electric remodel still fits a 150A or 200A service.
- Seeing how much a new EV charger changes a dwelling service screen.
- Comparing 120/240V detached-home service current with a 120/208V dwelling-unit service.
- Creating a quick first-pass service discussion before a panel-load or conductor review.
For downstream decisions, pair this page with the Electrical Service Size Calculator, the Electrical Panel Load Calculator, the Wire Size Calculator, and the Breaker Sizing Calculator.
Common Applications
More applications. Open to review 2 additional use cases.
Frequently Asked Questions
Is this a full NEC permit worksheet?
No. This page is a practical dwelling service-load screen. It does not claim to model every optional method, every local amendment, or every jurisdiction-specific worksheet requirement.
Why does the calculator use a 3 VA per square foot general load basis?
The page is intentionally built around the familiar dwelling service-load screen that many U.S. electricians still use when they search for an Article 220 style residential load calculator. Always confirm the adopted code edition in your jurisdiction before using any screen for permit work.
Does the calculator count both heating and cooling?
No. If you enter both, the result keeps only the larger noncoincident load. That makes it easier to compare the controlling seasonal load without double-counting both systems.
How should I enter EV charging?
Enter the EV charging demand basis you want screened from the charger nameplate, load-management setting, or project worksheet. If your project uses a utility or code-permitted energy-management method, review that separately because this page does not model those reductions.
Does a lower calculated result mean I should never install a larger service?
Not necessarily. Many modern U.S. homes choose additional headroom even when a first-pass load screen lands lower. The calculator shows the modeled next service size, but future electrification, utility requirements, and local practice may still justify a larger service.
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