About VoltFlow

VoltFlow is a free reference resource for electrical calculations, used by electricians, electrical engineers, contractors, solar installers, and DIY homeowners across more than 40 countries. We publish over 55 calculators and 100+ educational guides covering everything from NEC-compliant wire sizing to solar payback analysis to EV charging cost estimation.

Our core principle is straightforward: professional electrical reference tools should be free, fast, accurate, and built around real codes and standards. No paywalls. No required signups. No watered-down free version with the useful features hidden behind subscription. Just the tools, with the math shown clearly.

Our Mission

Electrical calculations affect safety. A wire sized too small heats up and starts fires. A breaker sized too large fails to trip during a fault. A solar system sized incorrectly underperforms or wastes capital. The math behind these decisions is not difficult, but it is unforgiving. We built VoltFlow to give people doing real electrical work a fast, reliable way to verify their calculations against the National Electrical Code (NEC 2023), IEC standards, and other relevant guidelines.

VoltFlow is not a replacement for a licensed electrician or for code review. It is a verification tool, a learning aid, and a way to estimate before committing to a design. We are explicit about this throughout the site.

The Team

Munir Ahmed — Founder & Lead Engineer

Electrical Engineering background · 10+ years in solar and electrical design

Munir founded VoltFlow in 2024 after years of frustration with electrical calculation tools that were either expensive, inaccurate, or both. He oversees calculator accuracy, NEC compliance reviews, and the editorial direction of all educational content. His work focuses on solar system design, voltage drop calculations, and load balancing for residential and small commercial applications.

Editorial Review Board

All NEC-related content on VoltFlow is reviewed by our internal team and cross-referenced against the published 2023 National Electrical Code, IEEE standards, and IEC 60364 where applicable. We update calculations within 60 days of any major code revision. Articles on solar economics are reviewed against the latest EIA data, EnergySage market reports, and SEIA industry briefings.

What Makes Our Calculators Different

Code-based formulas, not approximations. Every wire sizing calculation references NEC Table 310.16 ampacity values directly. Our voltage drop tool uses the standard 2K formula (2 × K × I × L / CM) rather than a simplified percentage shortcut. Our conduit fill calculator follows NEC Chapter 9, Table 1 fill percentages exactly.

Transparent math. Most of our calculators show the formula being applied and the intermediate values. You should never have to trust a black box for a calculation that affects safety.

Real data, regularly updated. Our electricity cost calculators use the latest EIA residential rate data (April 2026 as of this writing). Our solar pages incorporate the most recent EnergySage marketplace pricing. We refresh major data points quarterly.

Open about limitations. Where a calculator simplifies real-world conditions (for example, by assuming ambient temperature of 30 degrees C, or copper conductors only), we say so on the page.

How VoltFlow Is Funded

VoltFlow is supported by display advertising through Google AdSense. We do not sell user data, run sponsored content, or accept payment for favorable mentions in our calculator outputs or guides. The advertisements you see are matched to page content by Google's algorithms; we do not directly select advertisers.

This funding model lets us keep every tool free for every user, forever. No accounts, no rate limits, no upgrade prompts.

Standards We Reference

NFPA 70 (NEC 2023) — National Electrical Code, used for all US wire sizing, conduit, breaker, and grounding calculations.
IEC 60364 — International electrical installations standard, referenced for our European and international guides.
IEEE 519 — Harmonics and power quality, used in our power factor and 3-phase tools.
UL 1741 / UL 9540 — Solar inverter and energy storage system standards.
EIA Form-861 — Source for residential and commercial electricity rate data.
NREL PVWatts — Reference dataset for solar production estimates by location.

Contact

If you find an error in any calculator, have a suggestion for a new tool, or want to report a code update we have missed, get in touch via our contact page. We read every message and typically respond within 48 hours.

For media inquiries, partnership proposals, or technical collaboration, please use the same contact form and indicate the nature of your request in the subject line.

VoltFlow.net is operated independently. We are not affiliated with NFPA, IEEE, IEC, EIA, NREL, or any standards body referenced on this site. All trademarks are property of their respective owners. Last updated: April 2026.