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Measured on six things

Free NEC-compliant electrical calculators for wire sizing...

Speed

Mobile performance is poor (LCP 6.5s, CLS 0.467) while desktop is excellent (95/100). Mobile users on the job will face lag and layout shifts.

Screenshots

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ElectricianCalc

About this app

ElectricianCalc is a free, web-based suite of electrical calculators designed by an electrician for electricians. It takes the headache out of complex NEC calculations, offering tools for wire sizing, voltage drop, box fill, conduit fill, and power factor. The site is fully mobile-friendly, so you can use it on the job, and it provides instant, accurate results that follow the National Electrical Code. One of the standout features is the ability to link calculators together, allowing you to flow from a voltage drop calculation directly into wire sizing or conduit fill—a real time-saver when designing a full circuit. The new Construction Bid & Estimate Template is a bonus for contractors looking to create professional, accurate bids. Whether you're a seasoned pro, an apprentice studying for your license, or a homeowner planning a DIY project, ElectricianCalc offers reliable, code-compliant calculations that help ensure safety and prevent costly mistakes. It's a community-driven tool ...

Key features

1NEC-compliant calculators for wire sizing, voltage drop, box fill, conduit fill, and power factor.
2Linked calculator workflow: send results from voltage drop to wire sizing or conduit fill.
3Construction Bid & Estimate Template with automated formulas and color coding.

Target customer profile

Drawn from the product itself, not from a survey.

Demographic

Licensed Electricians and Electrical Contractors

Pain points

Manual NEC calculations are slow and error-prone; need quick, compliant results on-site to avoid rework and failed inspections.

Primary needs

Fast, accurate wire sizing, voltage drop, and box fill calculations; mobile access; and integration with their workflow (e.g., estimating templates).

Demographic

Electrical Engineering Students and Apprentices

Pain points

Understanding complex NEC tables and formulas is challenging; need a tool to verify their manual calculations and visualize concepts.

Primary needs

Accurate, educational tools that demonstrate NEC principles; practice for exams; and a way to cross-check their work.

Demographic

DIY Homeowners and Property Managers

Pain points

Electrical projects (like installing a new circuit) require precise wire sizes and box volumes; unsure about code compliance and safety.

Primary needs

Simple, reliable calculators; guidance on voltage drop for long runs; and assurance that their project meets NEC standards.

Scout Review

Written by AI from measured evidence, scored out of 100.

ElectricianCalc is a promising free tool for electricians, offering NEC-compliant calculators with a unique linked workflow. The design is functional but cluttered, and mobile performance needs work. Security is basic but acceptable for now. Accessibility has room for improvement. The idea has merit, but the lack of a moat and heavy competition from free alternatives limit growth. It's a solid utility, not a game-changer.

Measure by measure

Usability

Linked calculator workflow is a genuine time-saver. But CTAs are low-contrast links and consent popup interrupts first use. No docs, but FAQ covers basics.

Design

Consistent card grid with icons and clear messaging, but cookie modal blocks content and hero contrast is weak. Dense layout reduces visual hierarchy.

Speed

Mobile performance is poor (LCP 6.5s, CLS 0.467) while desktop is excellent (95/100). Mobile users on the job will face lag and layout shifts.

Security

HTTPS and basic headers present, but HSTS, CSP, SPF, DMARC missing. No security certifications or privacy policy details found. Typical for early-stage tool.

Accessibility

Lighthouse 88/100 with real issues: contrast, heading order, link color, touch targets. No a11y statement, but site is keyboard-navigable and responsive.

Growth

Clear problem, specific audience, and a unique linked workflow. But no network effects or data moat; free tools are easily copied. Room to grow in niche.

Improvement areas

Mobile performance: reduce LCP and CLS to ensure smooth on-site use.
Security: add HSTS, CSP, and DMARC headers; publish a privacy policy.
Accessibility: fix contrast, heading order, link color, and touch target sizes.

Design & Usability

ElectricianCalc presents a functional but unpolished design. The card grid is consistent and the NEC compliance messaging is clear, but the cookie modal blocks content and the hero contrast is weak. Usability is better: the linked calculator workflow is a standout, letting users flow from voltage drop to wire sizing seamlessly. However, CTAs are low-contrast text links and the consent popup interrupts first use. No dedicated docs, but the FAQ covers common questions. Overall, it's a tool that works but doesn't wow.

Speed & Security

Speed is a mixed bag: desktop performance is excellent (95/100), but mobile is poor (48/100) with high LCP and CLS. This is a problem for a tool marketed for on-the-job use. Security is basic: HTTPS and some headers are present, but HSTS, CSP, and DMARC are missing. No certifications or privacy policy details are visible. For an early-stage tool, this is typical, but it needs improvement to build trust with professionals.

Accessibility & Growth

Accessibility is decent (88/100) but has real issues: contrast, heading order, link color, and touch targets. No a11y statement or multi-language support. Growth potential is moderate: the problem is real and the audience is specific, but the free model and lack of network effects limit upside. The linked workflow is a differentiator, but it's easily copied. The bid template offers a potential revenue stream, but the core tool is a commodity.

Conclusion

If you're an electrician needing quick, code-compliant calculations, ElectricianCalc is worth a bookmark. The linked calculators are a genuine time-saver, and the price is right. But don't expect a polished experience—the cookie modal and mobile lag will test your patience. With some UX polish and a stronger security posture, this could become a go-to resource. For now, it's a handy tool with room to grow.

Suggestions for improvement

Fix the cookie modal to be less intrusive, e.g., a smaller banner that doesn't block content.
Improve mobile performance by optimizing images and reducing layout shifts (CLS).
Add an accessibility statement and fix contrast, heading order, and touch target sizes.
Implement HSTS and CSP headers to strengthen security posture.

How we score

Alternatives comparison

Named competitors, point by point. Nobody paid to appear here or to be left out.

	ElectricianCalc	Southwire Voltage Drop Calculator	MyElectricalTools
Voltage drop calculator	NEC-compliant, includes linked workflow to wire sizing/conduit fill.	Mobile app, focused on Southwire cable products, basic voltage drop.	Suite of calculators, less user-friendly interface.
Wire sizing calculator	Considers load, distance, voltage drop, temperature; NEC Table 310.16.	Wire sizing based on Southwire products, limited variables.	Basic wire sizing, may not include all NEC factors.
Box fill calculator	Applies NEC 314.16 rules automatically, recommends larger box if needed.	Not available.	May have box fill, but less comprehensive.
Mobile accessibility	Responsive web design, but mobile performance poor (LCP 6.5s).	Native mobile app, likely optimized for on-site use.	Mobile app, but interface less user-friendly.
Cost	Free, with optional bid template purchase.	Free, but product-focused.	Free, but may have ads or premium features.