GITNUXSOFTWARE ADVICE
Data Science AnalyticsTop 10 Best Load Calculator Software of 2026
Compare load calculator software options and tradeoffs for HVAC and engineering work, including where SkyCiv and Cool Calc fit.
How we ranked these tools
Vendors set the topic, but our editors set the inclusion criteria and the evaluation framework before research starts.
Search agents gather the source set and the review record, including transcriptions of video reviews and podcasts.
Framework: Features 40% · Ease 30% · Value 30%
Gitnux may earn a commission through links on this page — this does not influence rankings. Editorial policy
SkyCiv is the best choice for teams that need repeatable electrical load calculations tied to schedules and feeder inputs because its schedule-oriented workflow turns load entries into documentation-ready outputs, whereas Cool Calc fits plan-review handoffs better thanks to template-driven recalculation that preserves logic while assumptions change.
Editor’s top 3 picks
Three quick recommendations before you dive into the full comparison below — each one leads on a different dimension.
SkyCiv
Schedule-oriented load calculation workflow that turns load inputs into documentation-ready outputs.
Best for: Fits when teams need repeatable electrical load calculations tied to schedules and feeder inputs.
Cool Calc
Editor pickTemplate-driven demand-factor style recalculation that preserves calculation logic while users update design assumptions.
Best for: Fits when teams need repeatable electrical load calculations with quick scenario reruns for plan review handoffs.
Elite Software RHVAC
Editor pickHVAC equipment templates that generate demand-oriented electrical load outputs directly from HVAC system items.
Best for: Fits when HVAC-first electrical load work needs consistent demand estimates and panel-ready reports.
Comparison Table
SkyCiv
enterpriseStructural analysis and design software with beam, frame, and load combination calculation tools.
Schedule-oriented load calculation workflow that turns load inputs into documentation-ready outputs.
SkyCiv fits teams that need electrical load analysis results packaged for follow-on panel schedule generation and sizing steps. The workflow centers on choosing load types, applying demand-style factors, and then producing structured outputs that can be carried into design documentation. Automation is strongest when designs share repeatable patterns like occupancy-based load groups and standardized equipment lists.
A notable tradeoff is that the workflow is calculation-first rather than building a deep electrical network model for load flow and voltage-drop studies. SkyCiv is most useful when the main deliverables are connected versus demand load summaries, panel schedules, and feeder sizing inputs rather than system-level power quality modeling.
- +Demand-factor style workflow reduces manual spreadsheet copying
- +Panel schedule and report outputs support documentation handoff
- +Load grouping supports connected versus demand load comparisons
- +Consistent calculations for common electrical load analysis inputs
- –Network modeling for voltage drop and power quality is not the focus
- –Advanced edge-case assumptions may require careful input validation
- –Limited automation hooks compared with code-focused modeling tools
Electrical design teams
Create panel schedules from load groups
Faster schedule production
Consulting engineers
Feeders sizing input preparation
Cleaner sizing inputs
Show 2 more scenarios
Facilities engineering staff
Equipment additions for peak demand
Reduced recalculation effort
Recalculates demand-modeled load totals after equipment changes to estimate impact on schedules.
Electrical estimators
Document load basis for bids
More consistent bid packages
Generates repeatable load calculation reports that support bid documentation and internal review.
Best for: Fits when teams need repeatable electrical load calculations tied to schedules and feeder inputs.
Cool Calc
vertical specialistResidential HVAC load calculation software for Manual J, Manual S, and Manual D workflows.
Template-driven demand-factor style recalculation that preserves calculation logic while users update design assumptions.
Cool Calc focuses on electrical load calculator workflows like connected versus demand load and feeder and panel schedule style outputs. It provides spreadsheet-like calculation templates that keep NEC-based selection logic in a repeatable format.
The tool supports what-if parameter changes so teams can re-run demand factor scenarios without rebuilding the worksheet from scratch. Outputs are designed for project handoff, including reportable tables for load balancing style reviews.
- +Repeatable calculation templates for connected and demand load scenarios
- +What-if updates rerun calculations without rebuilding the entire sheet
- +Report-ready tables for load breakdowns used in review meetings
- +Works well for common panel and feeder sizing workflows
- –Less automation depth for API-driven integration into BIM pipelines
- –Limited coverage for advanced modeling like motor starting load cases
- –Scenario management can become manual for large multi-building studies
- –Governance controls for multi-user review are not as granular as enterprise tools
HVAC designers and planners
Consolidate room loads into zone totals
Zone and building load totals
Residential HVAC contractors
Estimate heating and cooling per room
Room-level load estimates
Show 2 more scenarios
Equipment selection designers
Support equipment sizing with load evidence
Selection-ready load calculations
Designers use heating, cooling, sensible, latent, and airflow results as selection evidence for reviews.
Project handoff teams
Export readable reports for installers
Handoff-ready calculation reports
Project teams generate documented calculation reports to share assumptions and results with downstream participants.
Best for: Fits when teams need repeatable electrical load calculations with quick scenario reruns for plan review handoffs.
Elite Software RHVAC
vertical specialistResidential HVAC design software for heat gain, heat loss, and equipment sizing calculations.
HVAC equipment templates that generate demand-oriented electrical load outputs directly from HVAC system items.
Elite Software RHVAC turns entered HVAC equipment data into electrical load summaries suitable for downstream electrical design steps. It supports demand factor style calculations that separate connected load from demand load for service entrance and distribution planning. Output can be generated as load and schedule reports that reduce manual reconciliation across equipment lists and panel assignments. For organizations doing repeated HVAC-first designs, RHVAC reduces rework by centralizing equipment-to-load mapping.
A key tradeoff is that RHVAC centers on HVAC equipment coverage and can require extra manual handling for non-HVAC systems like lighting controls or specialty process loads. RHVAC fits situations where a mechanical design team supplies equipment line items and electrical engineering needs consistent load baselines for panel and feeder documentation.
- +HVAC equipment driven load mapping for consistent connected to demand results
- +Report outputs tailored to distribution planning steps from equipment lists
- +Demand factor calculations geared to HVAC motor and compressor assemblies
- +Fewer spreadsheet handoffs when HVAC schedules are the primary input
- –Non-HVAC load categories need external inputs to complete full building scope
- –Limited flexibility when unusual equipment types fall outside HVAC templates
- –Long multi-building projects require disciplined naming for traceable outputs
MEP electrical designers
HVAC motor loads for panel sizing
Faster panel schedule drafting
Engineering project managers
HVAC equipment changes mid-design
Reduced revision churn
Show 1 more scenario
Consulting firms
Repeatable HVAC load calculations
More consistent load baselines
Standardizes connected versus demand calculations across similar projects using HVAC-driven inputs.
Best for: Fits when HVAC-first electrical load work needs consistent demand estimates and panel-ready reports.
Trane TRACE 3D Plus
vertical specialistHVAC design software for building loads, system sizing, and energy analysis.
Trane equipment linkage that carries modeling assumptions through electrical load and HVAC sizing outputs.
For electrical load analysis, Trane TRACE 3D Plus supports demand factor driven calculations and builds results from structured equipment and schedule inputs. For mechanical analysis, it ties connected loads to HVAC system assumptions so electrical and thermal impacts stay consistent across revisions. Output is delivered as calculation summaries and schedules that can feed downstream one-line diagram work and feeder sizing steps.
- +Keeps electrical and HVAC assumptions aligned across iterative design runs
- +Equipment schedule driven inputs reduce manual rework during revisions
- +Produces calculation reports that support downstream feeder planning
- +Trane equipment context improves sizing consistency for Trane-centric projects
- –Data entry overhead rises when project inputs differ from TRACE conventions
- –API and automation options are limited compared with general engineering toolchains
- –Workflow is less suited to highly custom modeling beyond supported assumptions
- –Collaboration governance controls are thin for multi-discipline review cycles
Mechanical and electrical design teams
Iterate concept loads during early design
Fewer recalculation cycles
Consulting engineers
Generate load summaries for distribution planning
Cleaner distribution packages
Show 2 more scenarios
Trane-centric project teams
Coordinate equipment sizing with electrical impacts
More consistent sizing
Uses Trane equipment context to keep electrical load inputs consistent with selected mechanical components.
Facilities engineering groups
Model connected load changes for upgrades
Faster upgrade assessments
Recalculates loads using updated equipment schedules to reflect renovation or capacity changes.
Best for: Fits when design teams need repeatable electrical and HVAC load calculations tied to equipment schedules.
ETAP
enterprisePower system modeling software with load flow, demand analysis, and electrical network calculation features.
Cross-study consistency from a single one-line model so load results feed protection and arc-flash calculations without re-entering assumptions.
ETAP computes electrical load analysis within detailed one-line and equipment models, then generates demand-based load results used for downstream sizing. Core workflows include bus and feeder loading calculations, voltage drop evaluation, motor starting load modeling, and short-circuit studies that connect to protection and arc-flash outputs.
- +Integrated one-line electrical model keeps load, voltage drop, and studies synchronized
- +Motor starting load modeling covers inrush impacts for downstream equipment checks
- +Equipment schedule import reduces manual re-entry across study runs
- +Exports one-line diagram outputs for consistent review and handoff
- –Modeling discipline is required to avoid inconsistent connected versus demand assumptions
- –Automation via API is limited compared with load-test specific tools like JMeter or k6
- –Large study models can slow configuration and iteration cycles
- –Specialty outputs like arc-flash workflow require detailed input coverage
Distribution design engineers
Size feeders and breakers from modeled loads
Equipment selections match electrical duty
Industrial plant electrical engineers
Assess upgrades with demand and protection impacts
Upgrade impacts quantified for decisions
Show 2 more scenarios
Substation grounding engineers
Verify touch and step voltages during faults
Grounding safety meets fault criteria
Engineers use fault study conditions with soil and grid inputs to perform grounding safety checks.
Relay coordination engineers
Tune relay settings against network faults
Coordination settings reflect modeled faults
Protection teams compare time-current behavior to fault results from the same electrical system model.
Best for: Fits when engineering teams need one-model electrical load analysis with study-linked outputs for design and review.
Calculator.net Electrical Calculator
SMBGeneral-purpose electrical calculator covering power, current, voltage, and resistance relationships.
Multi-calculator pages that let users switch calculation types and immediately review computed intermediate values.
Calculator.net Electrical Calculator is a web-based set of electrical load calculator tools that favors quick, form-driven results over project workflow management. It covers common demand factor and feeder load style calculations and provides step-by-step style outputs for common load analysis scenarios.
- +Form-based inputs make demand factor and load calculations fast to run
- +Calculation outputs show intermediate values users can cross-check manually
- +Supports multiple load calculation types in one place for quick comparisons
- +No project setup is needed to get results for a single sizing question
- –Limited automation means no end-to-end panel schedule generation workflow
- –No documented API or integration path for batch calculations or CI runs
- –Modeling is shallow compared to load flow analysis and arc-flash workflows
- –Requires manual data entry for large equipment schedules and bill-of-loads
Electrical engineers
Run feeder load calculations quickly
Feeder load values for design checks
MEP estimators
Verify demand factors for proposals
Bid-ready load numbers
Show 2 more scenarios
Facility electricians
Size loads for equipment additions
Sizing guidance for new circuits
Electricians calculate electrical loads for new devices without building a reusable schedule model.
Students and trainees
Practice load calculation methods
Correct calculation practice
Learners follow step-style outputs to understand how common formulas apply to typical load problems.
Best for: Fits when small teams need quick connected versus demand load checks without building a reusable model.
RapidTables Electrical Calculators
SMBCollection of electrical load, current, wattage, and voltage calculators for fast sizing work.
RapidTables provides focused, worksheet-style electrical calculators that separate common load workflows into individual runnable tools.
RapidTables Electrical Calculators computes electrical load analysis results such as demand factor and load breakdown using browser-based calculator pages. The site organizes common NEC-style calculation workflows like panel schedule generation inputs, service entrance sizing inputs, and voltage drop calculation style computations into separate tools.
- +Worksheet-style calculators guide input capture for common load studies
- +Fast scenario iteration for connected versus demand load assumptions
- +Single-phase versus three-phase modeling paths via distinct inputs
- +Copyable inputs make ad hoc comparisons straightforward
- –No API or automation surface for bulk load studies
- –Limited support for importing equipment schedules or BIM electrical models
- –Sparse audit trail for repeating calculations across a project lifecycle
- –Coverage gaps for advanced load flow and arc-flash incident energy
Electrical estimators and estimators
Size service entrance load calculations quickly
Repeatable load sizing worksheet results
Panel designers and contractors
Generate panel schedule demand breakdowns
Panel schedule load totals
Show 2 more scenarios
Electrical engineers and reviewers
Check voltage drop with explicit conductors
Documented voltage drop calculations
Enter conductor and voltage parameters to compute voltage drop style results per worksheet fields.
Home renovators and DIY electricians
Verify single-phase load scenarios
Scenario comparison for load planning
Reuse intermediate inputs to compare single-phase and three-phase variations for connected load assumptions.
Best for: Fits when small teams need quick, field-ready electrical load calculations without automation pipelines.
Engineering ToolBox Electrical Load Calculator
SMBWeb calculator for converting electrical load values into current and power sizing inputs.
One-page style calculators that combine connected load entry with demand factor outputs and phase-aware totals in a single run.
Engineering ToolBox Electrical Load Calculator is a web-based load calculation tool focused on quick electrical demand and feeder sizing from common building and panel inputs. It includes workflows for connected versus demand load, diversity factor handling, and voltage-drop related calculations driven by conductor and distance parameters.
- +Demand factor calculations are accessible from a small input set
- +Single-phase and three-phase option changes totals immediately
- +Voltage-drop style conductor and distance inputs produce usable results
- +Clear computed outputs for connected and demand load comparisons
- –Limited modeling for mixed-use loads beyond basic building categories
- –No export path for one-line diagram or schedule automation workflows
- –API and automation surface are absent for batch recalculation
- –No audit log or RBAC controls for controlled engineering signoff
Electrical engineers and designers
Size feeders from connected load assumptions
Faster load and feeder sizing
M&E contractors and estimators
Draft panel and branch circuit demand schedules
More consistent demand calculations
Show 2 more scenarios
Facility engineers
Check voltage drop using conductor distance
Lower risk of undervoltage
Calculates voltage-drop related results from conductor parameters and run length inputs.
Consulting electricians
Model single-phase versus three-phase totals
Correct phase-dependent load totals
Applies phase selection to compute electrical totals and intermediate results for different circuits.
Best for: Fits when small teams need fast demand and feeder sizing checks without importing models.
Southwire Voltage Drop Calculator
vertical specialistElectrical load and conductor sizing calculator for voltage drop and circuit planning.
Input-driven voltage-drop calculation tuned for conductor and distance parameters without the overhead of full load analysis.
Southwire Voltage Drop Calculator centers on voltage-drop engineering inputs rather than full electrical load analysis. It guides users through conductor selection, distance, current, and electrical parameters to compute voltage-drop results for common feeder and branch scenarios.
- +Focused voltage-drop workflow reduces irrelevant configuration steps
- +Conductor and run parameter inputs align directly with feeder voltage checks
- +Outputs support quick pass and fail decisions for connection planning
- +Single-purpose design fits into short design-review cycles
- –Limited scope compared with full demand load and NEC 220 workflows
- –No end-to-end panel schedule or connected-versus-demand reporting
- –Automation and API surfaces are not provided for batch design runs
- –Complex multi-phase and neutral cases require manual handling
Electrical designers
Check voltage drop on feeder runs
Confirm conductor sizing meets limits
Facilities engineers
Validate voltage drop after equipment changes
Reduce commissioning reruns
Show 2 more scenarios
Industrial electricians
Verify branch cable connections
Avoid low-voltage operation
Guides circuit checks for typical branch layouts to ensure voltage-drop stays within acceptable ranges.
Electrical contractors
Support connection planning for bids
Justify conductor and routing
Produces voltage-drop calculations that support feeder and branch connection planning documents for proposals.
Best for: Fits when voltage-drop verification needs a fast, conductor-specific calculation workflow for feeder planning.
MELTRIC Cable Selector
vertical specialistVendor-hosted load and cable sizing calculator for electrical loads and connector selection.
MELTRIC-specific compatibility mapping links calculation inputs to cable and connector selections in one guided workflow.
MELTRIC Cable Selector is a vendor-focused load and cable selection calculator built around MELTRIC products rather than a general electrical design modeling suite. It calculates feeder and cable sizing inputs for typical residential and light commercial load analysis workflows and ties results to compatible MELTRIC cable and connector configurations.
- +Product-anchored selection reduces errors when matching MELTRIC cable assemblies
- +Guided input forms speed common feeder sizing scenarios
- +Consistent outputs support repeatable cable sizing checks
- +Clear compatibility mapping between results and MELTRIC components
- –Limited scope for load analysis that extends beyond MELTRIC product types
- –No documented API or automation hooks for calculator-driven workflows
- –Thin coverage for advanced studies like arc-flash and short-circuit coordination
- –Exports and integrations for panel schedule generation are not a primary strength
Electrical contractors and estimators
Feeder sizing for new panel jobs
Faster quote-ready cable recommendations
Electrical engineers at design offices
Routine residential load calculations
Reduced manual product cross-checking
Show 2 more scenarios
Facilities planners for renovations
Upgrading feeders for light commercial spaces
More consistent renovation planning
Generates cable selection results tied to MELTRIC connectors for common upgrade scenarios.
Project managers coordinating procurement
Preparing BOM inputs for vendors
Lower risk of mismatched parts
Converts load sizing assumptions into cable and connector selections to streamline procurement lists.
Best for: Fits when teams need quick MELTRIC-specific feeder and cable selection without deeper modeling.
Conclusion
After evaluating 10 load calculator software, SkyCiv stands out as our overall top pick — it scored highest across our combined criteria of features, ease of use, and value, which is why it sits at #1 in the rankings above.
Use the comparison table and detailed reviews above to validate the fit against your own requirements before committing to a tool.
Frequently Asked Questions About Load Calculator Software
How do Apache JMeter, Gatling, and k6 differ from load calculator software for electrical demand calculations?
Which tool supports end-to-end electrical network modeling that links load results to protection and arc-flash outputs?
When does HVAC equipment-first modeling matter for electrical load outputs?
What breaks if connected-versus-demand assumptions are changed between runs without preserving the original calculation logic?
How do load calculators handle phase modeling for totals and intermediate values?
How does schedule import or equipment list workflow affect rework between electrical modeling and reporting?
When is a dedicated voltage-drop workflow a better fit than a full electrical load model?
What integration or API expectations are realistic across these tools for automation and data pipelines?
Which tool is most suited for quick, browser-based worksheet calculations without building a reusable electrical model?
Tools reviewed
Primary sources checked during evaluation.
Referenced in the comparison table and product reviews above.
How to Choose the Right Load Calculator Software
What separates load calculator software options is whether the results stay traceable from your input data to the final load worksheet. Pay closest attention to input templates, model assumptions, and how outputs export for review.
Load input templates and import
Why it matters
With load input templates and import, we avoid retyping common building and equipment data each time a project changes. That directly affects how quickly you can compare scenarios and keep a consistent basis for results.
How to check
Ask to load a sample project file (or spreadsheet) and show how fields map into the worksheet. Try adding one circuit or panel and confirm the template updates the recalculated totals automatically.
Code-style calculation basis control
Why it matters
Load calculator outputs can shift when the calculation basis changes, so control over that basis matters for auditability. This is where teams prevent “same data, different numbers” across revisions.
How to check
In a demo, switch between at least two common basis profiles the product supports and compare a single page of results. Confirm the UI clearly states what was used for each output section (not just in a hidden settings screen).
Motor and diversity handling clarity
Why it matters
Motor and diversity handling affects peak and continuous totals, so clarity reduces surprises during stakeholder review. If those assumptions aren’t explicit, approvals slow down.
How to check
Run a scenario with at least one motor and one non-motor branch and inspect the separate assumption lines (or intermediate fields) in the output. Ask what happens when you change motor parameters and verify the recalculation scope matches expectations.
Phase and wiring rule coverage
Why it matters
Phase and wiring rule coverage matters because many projects hinge on single-phase versus multi-phase wiring details and how neutral-related portions are treated. Partial coverage forces manual workarounds that break traceability.
How to check
Test a small project that includes both single-phase and three-phase groups (or the closest equivalents the tool supports). Verify the output totals reconcile to the same circuits shown in the worksheet view, not just a final summary.
Exportable worksheets and diagrams
Why it matters
Exportable worksheets and diagrams let we keep results in the formats stakeholders expect and reduce rework after each revision. The key is whether exports preserve traceability back to inputs and assumptions.
How to check
Export the same scenario to at least two formats (for example, PDF and spreadsheet). Check that each exported section remains consistent with the on-screen numbers and that circuit/panel identifiers carry through.
Scenario versioning and comparison
Why it matters
Scenario versioning and comparison helps us evaluate changes without losing the story of what changed. When the tool supports side-by-side comparisons, review cycles speed up without guesswork.
How to check
Create two scenarios that differ by one input group (like adding equipment load or changing a motor parameter). Show whether the tool highlights differences and retains previous assumptions so you can re-export the older scenario unchanged.
Red flags
- Totals change when you edit unrelated fields, suggesting hidden recalculation rules.
- Assumptions for motor handling or diversity are not visible in the worksheet outputs.
- Exports don’t preserve circuit/panel identifiers, breaking traceability in review.
Fit by situation
- If you reuse load data across projects with recurring panels, prioritize Load input templates and import.
- If your team must explain why numbers changed between revisions, prioritize Code-style calculation basis control.
- If your projects include mixed motor and wiring arrangements, prioritize Motor and diversity handling clarity.
Funding and competing interests
This study was co-funded by several of the vendors assessed in it. No single vendor funded it. Funders could propose the market studied.
They had no role in selecting vendors, setting or weighting criteria, analysing data or drawing conclusions, and they received the same factual-accuracy check as every other vendor assessed.
Market definition, inclusion rules and criteria weights were fixed by an editor before research began and did not change afterwards. Editorial process →
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