Is the Electrical Load Schedule Builder free to use?

Yes. The Electrical Load Schedule Builder is a free browser-based planning calculator from I Love MEP.

Can the Electrical Load Schedule Builder be used for final engineering design?

No. The result is for planning, tender review, and coordination support. Final design must be checked by a qualified engineer against project specifications, authority requirements, and applicable standards.

Does the PDF report replace approved design calculations?

No. The PDF report records inputs, assumptions, warnings, and planning results. It should be reviewed before any construction, procurement, or authority submission decision.

Electrical Load Schedule Builder

A load schedule planning tool for connected loads, demand factors, power factor, spare capacity, and recommended panel rating.

Last updated: July 27, 2026

Inputs

Forms are empty on load. Use sample data to preview the workflow or enter your own project values.

Learn more

Formula logic, use cases, assumptions, and limits for this tool.

How this tool helps

Use this for panel, transformer, and feeder planning where connected load and expected demand load differ.

Assumptions and limits

This tool provides a planning-level result. It does not replace detailed engineering design, approved software, manufacturer data, authority requirements, or project specifications.

Typical use cases

Early estimation and tender support.
BOQ sanity checking and technical review.
Site discussion before final engineering verification.
Comparison of alternatives using consistent assumptions.

Result interpretation

Read the recommendation, warning, and confidence sections together. A result without warnings is still not an approval; it only means the entered values did not trigger built-in planning alerts.

Input definitions and typical values

These notes explain what each input means and which values usually produce a more reliable planning result.

Lighting load kW

Lighting load. LED spaces are often 8-12 W/m2; older lighting or retail display lighting can be higher.

Small power load kW

Small power load. Use connected socket load and diversity appropriate to room use, not every socket at full load unless required.

HVAC load kW

HVAC electrical load. Include chillers, AHUs, FCUs, pumps, fans, heaters, and controls as applicable.

Motor load kW

Motor load. Use starting behavior, duty, PF, efficiency, and diversity where relevant.

Other load kW

Other connected load not captured in named categories. Keep notes so this allowance is traceable.

Overall demand factor %

Expected demand load after diversity. This is usually lower than total connected load.

Power factor

Power factor. 0.8-0.95 is common for many loads; motors and mixed loads should use measured or specified PF.

Spare capacity %

Future spare capacity. 10-25% is common in early MEP planning, depending on client growth and infrastructure constraints.

Practical verification checklist

Confirm the selected standard profile is suitable for the project location and authority.
Replace sample values with project drawings, schedules, equipment data, or measured site values.
Review warnings, methodology, and PDF report before using the result outside early planning.
Verify final decisions against official standards, manufacturer data, consultant specifications, and local approvals.

Standards references for verification

For final design checks, verify calculator assumptions against the project documents and official standards bodies such as ASHRAE, NFPA, IEC, IET BS 7671, ICC, and CIBSE.

Calculation methodology

Connected load is multiplied by demand factor, converted to kVA using power factor, then spare capacity is added.

Inputs are treated as planning assumptions. The calculator shows warnings when entered values fall outside practical thresholds or selected standard-profile limits.

View full methodology notes

Version history

v1.3.6-prelaunch: Added methodology, standard profile support, version notes, and direct PDF report download.
v1.3.5: Calculator page added with sample data, warnings, and print-ready report layout.

Stage 2 roadmap: optional saved projects, dashboards, and shared calculation history without forcing login for free use.

Trust and verification

Every result includes assumptions, warning logic, and a downloadable report. Final engineering decisions still need qualified review, local authority approval, manufacturer data, and project specifications.

Worked example

Use the sample data button to load a realistic scenario, then download the PDF report to review inputs, results, methodology, warnings, and disclaimers in one place.