GITNUXSOFTWARE REVIEW
Business & FinanceTop 10 Best Load Calculation Software of 2026
Compare load calculation software options for engineering teams, including ETAP, with notes on fit, inputs, and tradeoffs.
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%
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Cool Calc is the best pick for electrical engineers working on repeatable residential Manual J-style demand and service load calcs because its worksheet-driven flow ties equipment inputs to reviewable outputs, while EasyPower is a better fit for NEC-focused design teams since its demand calculation reporting maps load group inputs to equipment sizing with clear grouping.
Editor’s top 3 picks
Three quick recommendations before you dive into the full comparison below — each one leads on a different dimension.
Cool Calc
Demand factor and service load calculation flow ties equipment inputs directly to reviewable outputs.
Best for: Fits when electrical engineers need repeatable demand and service load calculations for multi-equipment projects.
EasyPower
Editor pickNEC Article 220 demand calculation reporting that maps load group inputs to equipment sizing outputs.
Best for: Fits when electrical design teams need repeatable NEC-based load calculations with documented panel and feeder sizing.
ETAP
Editor pickModel-driven load calculation ties equipment, demand factors, and distribution objects so updates propagate without rebuilding spreadsheets.
Best for: Fits when teams need repeatable electrical demand studies tied to distribution planning.
Comparison Table
Cool Calc
SMBOnline HVAC load calculation software for residential Manual J analysis.
Demand factor and service load calculation flow ties equipment inputs directly to reviewable outputs.
Cool Calc is built around form-style calculation pages for assembling equipment counts, ratings, operating modes, and sizing drivers into an electrical demand stack. Its core workflow keeps assumptions close to the inputs, which reduces context switching when recalculating for design-condition changes or revised equipment schedules. Output generation supports report-style documentation so teams can carry calculation results into panel schedule or feeder sizing steps.
A notable tradeoff is that Cool Calc concentrates on electrical demand and load calculation outputs more than on HVAC-specific envelope and psychrometric modeling. It fits well for electrical engineers and consultants producing repeatable service load calculations where configuration and audit trails matter for internal review and client submittals.
- +Worksheet-driven electrical load inputs reduce rework during revisions
- +Demand and service load outputs support consistent equipment sizing chains
- +Report-ready outputs help document assumptions for design review
- +Reusable calculation setups speed repeat project workflows
- –Electrical-first scope leaves HVAC load tasks to other tools
- –Complex rule sets can require careful configuration to match standards
Electrical engineering firms
Service and feeder load calculations
Fewer assumption mismatches
Consulting designers
Client submittal calculation reports
Faster approval cycles
Show 1 more scenario
Facility project teams
Revision tracking during design changes
Reduced recalculation time
Teams rerun electrical load calculations when equipment schedules change mid-project.
Best for: Fits when electrical engineers need repeatable demand and service load calculations for multi-equipment projects.
EasyPower
enterpriseElectrical power system software for load flow, short-circuit, and equipment studies.
NEC Article 220 demand calculation reporting that maps load group inputs to equipment sizing outputs.
EasyPower is built around electrical design inputs and calculation runs that produce consolidated totals for connected load, demand factors, and equipment sizing. The core workflow connects room or area load entry to final panel and circuit summaries, so electrical design review can stay inside one calculation context. Automation comes from template-driven projects and bulk edits across multiple loads when design assumptions repeat.
A tradeoff appears in projects that need very custom non-electrical inputs such as detailed envelope heat-loss models, because EasyPower centers on electrical load logic rather than HVAC heat gain calculations. EasyPower fits best when electrical scope is the primary deliverable and teams need repeatable NEC-based calculations with consistent documentation across many rooms or tenants.
- +NEC-focused demand and service sizing workflow with clear calculation grouping
- +Template-driven assumptions reduce repetitive data entry across projects
- +Panel and circuit summaries stay tied to the same calculation run
- +Report outputs support structured review of totals and equipment results
- –Not designed for HVAC heat-loss style inputs as a primary engine
- –Complex project models can require careful organization of load categories
- –Electrical-first data entry can feel heavy for early concept iterations
- –Extensibility depends on external data preparation for nonstandard inputs
Electrical design engineers
NEC load calculations for new tenant
Consistent demand totals
Consulting engineering firms
Standardized templates across multi-site work
Faster repeat projects
Show 2 more scenarios
Design drafters and CAD support
Panel schedule preparation from totals
Fewer mismatches
Use calculation outputs to produce panel and circuit summaries that match the load run.
Electrical PMs and reviewers
Audit and review of calculation logic
Clear reviewer trail
Review structured report views of connected loads and demand computations for equipment sizing decisions.
Best for: Fits when electrical design teams need repeatable NEC-based load calculations with documented panel and feeder sizing.
ETAP
enterpriseElectrical engineering software that performs load flow, sizing, and system studies.
Model-driven load calculation ties equipment, demand factors, and distribution objects so updates propagate without rebuilding spreadsheets.
ETAP targets electrical engineering deliverables by turning building and equipment inputs into structured load results and electrical design inputs. Load outputs can be fed into device sizing and distribution planning steps, which helps teams keep NEC Article 220 demand logic consistent across studies and revisions.
A tradeoff appears when the project focus is HVAC load calculation or Manual J style heat gain and heat loss worksheets, because ETAP’s strongest coverage stays in electrical domain workflows. ETAP fits best when an electrical contractor, consulting engineer, or facilities engineering team needs repeatable electrical service and feeder load studies tied to a controlled electrical data set.
- +Electrical load results stay connected to downstream distribution design objects
- +Demand aggregation supports consistent NEC Article 220 style workflow across revisions
- +Reporting outputs reduce manual copy-paste from calculation sheets
- +Model-driven updates keep load studies aligned with equipment changes
- –Electrical-first modeling makes HVAC load studies a weaker fit
- –Large models require disciplined data entry to keep results trustworthy
- –Some advanced electrical reporting layouts need extra formatting effort
- –Cross-discipline handoffs can require export and re-mapping outside ETAP
Electrical consulting engineers
Service and feeder load studies
Fewer reconciliation errors
Electrical contractors
Revision tracking during design changes
Faster design iterations
Show 1 more scenario
Facilities engineering teams
As-built load baselines
Clearer electrical capacity view
ETAP helps consolidate equipment inventories into electrical demand reports for ongoing system planning.
Best for: Fits when teams need repeatable electrical demand studies tied to distribution planning.
SKM Power*Tools
enterpriseElectrical system analysis software covering load flow, short circuit, and arc flash studies.
Topology-aware electrical load engine that ties device ratings to feeder and service load results from the electrical model.
SKM Power*Tools calculates electrical load and demand using connected electrical network data, then generates load summaries for downstream design steps. The core workflow centers on drawing or importing electrical components, assigning ratings, and using power system models to produce feeder and service load results tied to the modeled topology.
- +Topology-based load calculation links device assignments to feeder and service results
- +Model-driven recalculation keeps load outputs consistent with electrical changes
- +Deliverable-style reporting supports panel and feeder documentation workflows
- +Electrical design focus reduces manual mapping between equipment and load tables
- –Electrical-input modeling effort is required before load results become meaningful
- –Cross-discipline workflows for HVAC load calculations require separate processes or tools
Electrical design engineers
Assess feeder load flow and voltage
Design-ready electrical study outputs
Facility engineers
Size generators from connected load
Generator rating inputs
Show 2 more scenarios
Grounding and substation teams
Calculate fault currents for ground grid
Review-ready grounding calculations
Grounding specialists model electrode and conductor layouts and produce fault-current distribution calculations.
Engineering managers
Compare study outputs across revisions
Traceable iteration comparisons
Study teams keep repeatable study cases and recalculate results after equipment or configuration changes.
Best for: Fits when electrical engineers need modeled topology load outputs that stay consistent through revisions and reporting cycles.
Trane TRACE 3D Plus
enterpriseBuilding load and HVAC simulation software for commercial system design.
Geometry-based model processing for room and whole-building load takeoffs using Trane TRACE calculation routines.
Trane TRACE 3D Plus is a whole-building load calculation tool used to produce heating and cooling loads with geometry-driven heat transfer results. It centers on an occupancy and equipment aware workflow that connects building envelope inputs to system-level outputs used for equipment sizing.
- +3D model-driven heat transfer calculations reduce manual room math errors
- +Project templates standardize design condition assumptions across load cases
- +System and equipment worksheets tie loads to downstream sizing outputs
- +Traceable inputs improve review of envelope and internal gain assumptions
- –Trane-aligned modeling workflow can add friction for nonstandard vendor systems
- –Geometric detail increases modeling effort for early-stage concepts
- –Automation depends on template setup rather than self-discovering rules
- –External data import depth can be limited for CAD or BIM authoring formats
Commercial mechanical engineers
Model rooms and zone loads
HVAC sizing inputs
HVAC engineers
Size ducts with routing geometry
Consistent duct dimensions
Show 2 more scenarios
VRF system designers
Coordinate VRF layout with calculations
Documented VRF design
Teams configure Trane VRF selections and connect them with three-dimensional layouts and system-level calculations.
Energy and retrofit analysts
Compare hourly retrofit load impacts
Retrofit decision comparisons
Analysts run hourly building and system simulations to compare retrofit options using load and performance outputs.
Best for: Fits when Trane-focused teams need consistent whole-building heating and cooling load reporting tied to sizing workflows.
Elite CHVAC
vertical specialistHVAC software for commercial heating and cooling load calculations.
Unified HVAC-to-electrical workflow links load assumptions to electrical service load calculation reporting in one project.
Elite CHVAC pairs heating and cooling load workflows with electrical load reporting inside a single calculation environment. It focuses on structured inputs such as building envelope parameters, internal gains, and ventilation assumptions, then produces room-by-room and whole-building outputs aligned to common HVAC sizing conventions.
- +Single workflow connects HVAC assumptions to electrical service load calculation outputs
- +Room-by-room results support practical downstream equipment sizing handoffs
- +Report generation packages assumptions and results into shareable load documentation
- +Heating and cooling calculation outputs stay organized under the same project structure
- –CAD and BIM integration support is limited compared with engineering-first alternatives
- –Manual input depth increases setup time for large buildings with many zones
- –Automation and API access for custom reporting is not a strong focus
- –Governance controls like granular RBAC and audit logs are not a standout capability
HVAC engineers
Calculate heating and cooling for commercial spaces
HVAC sizing basis
Mechanical design teams
Document room-level loads and assumptions
Traceable room results
Show 2 more scenarios
Project engineers and reviewers
Compare load changes after revisions
Assumption-to-output traceability
Teams recalculate projects after updates to spaces or systems and review how calculated loads shift.
Energy analysts
Estimate peak-oriented heating and cooling needs
Peak sizing outputs
Sizing teams evaluate steady-state heating and cooling requirements using building and weather inputs without full hourly simulation.
Best for: Fits when teams need one maintained tool for both HVAC load output and electrical service load reporting.
Design Master Electrical
SMBElectrical design software with feeder sizing, panel schedules, and load calculations.
NEC Article 220 demand logic tied to feeder and panel schedules with regeneration-friendly templates.
Design Master Electrical focuses on electrical load calculation workflows with project libraries for feeder, service, and panel-level demand derivations. It supports NEC Article 220 style input paths that feed load summaries and downstream schedules used for equipment and conductor sizing handoffs.
- +Templates for feeder and panel derivations reduce rework during design iterations.
- +NEC Article 220 focused workflows map inputs to electrical demand summaries.
- +Project libraries standardize circuit and connected equipment data across projects.
- +Output formats support handoff from load calculation to equipment and conduit sizing tasks.
- –Automation depth is concentrated on electrical load steps rather than full building calculations.
- –Complex projects require disciplined library setup to prevent inconsistent assumptions.
- –Cross-domain coordination with HVAC load models is not a native workflow focus.
- –Report customization can require more manual layout work than export-first tools.
Electrical design engineers
Feeder and service demand calculations
Consistent demand calculations across revisions
Electrical consulting firms
Panel-level connected load schedules
Faster schedule regeneration
Show 2 more scenarios
Project managers
Design condition review and traceability
Clear audit trail for revisions
Organizes reports to support review of assumptions used to reach electrical design conditions.
Estimators and estimations teams
Standardized load derivations for takeoffs
More repeatable estimate inputs
Reuses library-based load pathways to regenerate demand inputs for equipment and conductor estimates.
Best for: Fits when electrical design teams need repeatable NEC-based load calculations and consistent panel and feeder demand outputs.
CYME
enterprisePower engineering software for distribution planning, load flow, and network analysis.
Network study environment that ties topology inputs to electrical demand and system performance outputs in one recalculation loop.
CYME is load calculation software built around electrical power system studies that range from service and feeder demand through protection and network analysis. It supports engineering workflows that connect topology inputs to resulting electrical demand, voltage behavior, and thermal or short-circuit related outputs.
- +Strong electrical network modeling with repeatable project recalculation behavior
- +Outputs align with electrical design deliverables like demand and network performance results
- +Topology-driven study workflow supports consistent assumptions across scenarios
- +Good fit for multi-building or campus scale electrical system studies
- –Not designed for whole-building Manual-style heating and cooling load workflows
- –Workflow depth can require disciplined model setup to avoid scenario drift
- –Report customization can be slower when outputs must match strict templates
- –Automation depends on available import and export paths rather than full API-first control
Distribution engineers
Feeder demand and voltage studies for updates
Revised design load estimates
Protection engineers
Coordination and short-circuit response verification
Verified protection coordination
Show 2 more scenarios
Utility planning teams
Scenario recalculation with reusable project data
Faster scenario comparisons
CYME keeps topology, conductor, and device assumptions consistent across recalculation runs for planning scenarios.
Industrial electrical designers
Import topology, export study documentation
Documentation-ready study reports
CYME imports engineering data into study projects and exports report outputs for design recordkeeping.
Best for: Fits when electrical engineers need topology-based electrical demand and network study results across repeat scenarios.
Carrier HAP
enterpriseHVAC analysis software for calculating building loads, energy use, and system performance.
HVAC system-aware load assumptions and documentation outputs tailored for Carrier-style sizing workflows.
Carrier HAP is a load calculation tool aimed at whole-building heating and cooling design workflows, with an emphasis on HVAC system-aware assumptions and reporting. It supports room-by-room modeling for heat loss and heat gain, then ties results into equipment and system sizing activities.
- +Room-by-room heat loss and heat gain workflow with engineering-style outputs
- +Template-driven project setup for recurring building designs
- +HVAC system assumptions are integrated into the load calculation workflow
- +Report outputs are suited for documentation of design conditions and results
- –Model setup requires careful configuration to avoid envelope and schedule mistakes
- –Automation is strongest through templates, not through broad third-party integration APIs
- –Export and data reuse outside the Carrier workflow can be limited
- –User experience feels calculation-centric rather than spreadsheet-editing friendly
Commercial HVAC engineering teams
Apply code-oriented design calculations
Consistent sizing assumptions
HVAC engineers and mechanical designers
Produce zone load results for HVAC sizing
Equipment-ready zone loads
Show 2 more scenarios
Building design and thermal specialists
Test envelope and infiltration assumptions
Comparable load scenarios
Teams vary envelope assemblies and infiltration inputs to compare how thermal assumptions change calculated design loads.
HVAC retrofit and facilities teams
Establish baselines for system upgrades
Documented upgrade baselines
Facilities engineering teams document thermal and equipment baselines to evaluate changes to existing building HVAC systems.
Best for: Fits when HVAC engineers need repeatable room-by-room load calculations aligned to Carrier HVAC design documentation.
SkyCiv Structural 3D
API-firstCloud structural analysis software for applied loads, load combinations, and member checks.
Calculator-style scripting for parametric structural model generation and batch analysis runs.
SkyCiv Structural 3D performs structural load modeling and analysis, including beam, frame, and truss workflows driven by defined loads and support conditions. It adds engineering-friendly automation through a calculator-driven scripting interface and exportable results for downstream reporting.
- +Load cases and combinations are managed inside the structural model for traceable results.
- +Scripting enables repeatable model setup and batch reruns for iterative design.
- +Results export supports controlled handoff from analysis to documentation workflows.
- +3D frame, beam, and truss modeling covers common structural load paths.
- –Not designed for electrical demand factor workflows or NEC Article 220 service loading.
- –HVAC whole-building heat loss and heat gain calculations require separate tooling.
- –Advanced automation depends on scripting literacy and model parameter discipline.
- –Some reporting formats for load calculation reports need post-processing outside the tool.
Building structural engineers
Generate wind load cases for models
More consistent wind checks
Residential structural designers
Analyze gravity and lateral residential loads
Member forces and documentation
Show 2 more scenarios
Timber and wood structure engineers
Run timber load analysis and checks
Timber member sizing outputs
Teams analyze timber frames and members for gravity and lateral load cases with integrated design checks and outputs.
Steel structural engineers
Combine loads for steel frame design
Repeatable steel design workflow
Engineers model steel frames, apply load combinations, and review member forces, deflections, and design checks.
Best for: Fits when teams need repeatable structural load case analysis for frames and trusses before design documentation.
Conclusion
After evaluating 10 load calculation software, Cool Calc 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 Calculation Software
How do EasyPower and ETAP differ in how they produce electrical demand and downstream outputs?
Which tool best supports topology-driven electrical demand when revisions happen often?
When is Cool Calc a better fit than a general electrical workspace tool for worksheet-driven consistency?
What breaks if a team tries to use Elite CHVAC for electrical service load reporting only?
How does Trane TRACE 3D Plus handle geometry-driven results compared to room-by-room worksheet approaches?
Where does CYME fall short if the primary deliverable is NEC Article 220 style demand schedules?
Which integrations or APIs support automation for importing inputs and exporting electrical results?
What security and admin controls should be checked before approving a load calculation tool for a shared engineering team?
How should data migration be handled when moving existing electrical load inputs into EasyPower versus Design Master Electrical?
Tools reviewed
Primary sources checked during evaluation.
Referenced in the comparison table and product reviews above.
How to Choose the Right Load Calculation Software
We look for differences that show up in daily calculations and deliverables: whether a tool’s calculation engine and input/output mapping match your workflow, and whether its automation and report outputs hold up when you reuse cases. The biggest gaps usually appear in Calculation method coverage, Input normalization, Output artifacts, and Automation with API and templates.
Calculation method coverage
Why it matters
Load calculation work varies by scope and conventions, so Calculation method coverage affects whether you can model your cases without manual workarounds. It also determines how consistent your results stay across different project types.
How to check
Ask for a sample workbook or demo case that mirrors your scope. Check whether it supports the same calculation paths you expect and whether it produces intermediate outputs (not just a final number).
Input normalization workflow
Why it matters
Input normalization workflow matters because load inputs come from forms, schedules, or spreadsheets. When data fields line up poorly, teams spend time translating inputs and risk errors that change the load outcome.
How to check
During the demo, try importing a small spreadsheet or copying a sample dataset. Verify how the tool handles units, naming, defaults, and missing fields, and whether it flags inconsistencies before calculating.
Output artifacts and traceability
Why it matters
Output artifacts and traceability are what you reuse in design review, coordination, and revisions. If the tool can’t show assumptions and intermediate results clearly, you’ll struggle to audit changes later.
How to check
Request a report preview plus an exports view (PDF and spreadsheet if available). Look for traceability from inputs to results, including calculation notes and a way to compare revisions between runs.
Automation via templates and API
Why it matters
Automation via templates and API is a practical divider for teams that rerun calculations often. Deeper automation reduces re-entry and keeps configuration consistent across projects.
How to check
Ask whether the tool offers predefined calculation templates and whether you can automate runs via an API or batch import. In the demo, request a walkthrough of setting up a repeatable run and capturing results programmatically.
Admin controls and audit log
Why it matters
Admin controls and audit log matter when multiple people edit inputs and results. Strong governance helps prevent unnoticed changes and supports repeatable approvals for load deliverables.
How to check
Ask how roles and permissions work for viewing vs editing cases. Request an audit log example showing who changed what fields, and see whether it records calculation configuration, not only comments.
Red flags
- Only final results are exportable; intermediate assumptions aren’t traceable.
- Imports silently accept wrong units or leave key fields unvalidated.
- Automation requires manual UI steps each time, with no repeatable template runs.
Fit by situation
- If you reuse the same modeling approach across many projects, prioritize Calculation method coverage.
- If your team mixes spreadsheets and forms and runs into mismatched fields, prioritize Input normalization workflow.
- If you need repeatable reruns with controlled edits, prioritize Admin controls and audit log.
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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