Terms of Use
The rules for using eCircuitCalc’s free calculators, converters and learning resources — what you can do with them, and where our responsibility ends.
Last updated:
1. Acceptance of These Terms
By accessing or using eCircuitCalc (the “Site”), including its calculators, unit converters, reference tables and learning content, you agree to be bound by these Terms of Use and by our Privacy Policy. If you do not agree with any part of these terms, please do not use the Site.
2. About the Service
eCircuitCalc provides a free, web-based suite of tools for electronics and electrical engineering, including but not limited to:
- Circuit component calculators — resistors (including E-series and colour code), capacitors, inductors, transformers, semiconductors, op-amps, transistors and amplifiers.
- Core electrical calculations — Ohm’s law, power, impedance, decibels and audio matching.
- Design tools — LED circuit design, frequency filters, power supply rectifiers, RF and antenna calculators, motor and generator tools.
- Battery and energy tools — battery life, series/parallel configurations, charging time and Ah/mAh conversion.
- Unit converters and reference material — unit conversions, formula sheets, schematic symbol guides and datasheet reading guides.
The Site is provided at no cost. We may modify, add to or discontinue any calculator or feature at any time without notice.
3. Use of Calculators — Results Are for Reference Only
All calculators apply standard textbook formulas and idealised assumptions. Results are provided for education, estimation and preliminary design reference only, and are not:
- A substitute for professional engineering judgement, licensed review or sign-off.
- A substitute for simulation (SPICE or equivalent), calculation against manufacturer datasheets, or physical measurement and testing.
- A guarantee that a real circuit will behave as predicted — component tolerances, parasitics, thermal effects, layout and operating conditions all affect real-world results.
Safety: You are solely responsible for any design you build or implement based on results from this Site. Circuits involving mains voltage, high power, batteries, motors or other hazardous energy can cause serious injury, death or property damage. Always follow applicable safety standards and codes, and consult a qualified professional when in doubt.
You agree that you use all calculators, results and content at your own risk, and that eCircuitCalc makes no representation that any particular result is fit for your application.
4. Educational Content
Articles in the Learn Electronics section, formula sheets, symbol references, datasheet guides and checklists are provided for general information and education. They may be simplified or incomplete for advanced applications and should be verified against authoritative sources before use in any real design.
5. Acceptable Use
When using the Site you agree not to:
- Use the calculators or content in a way that violates any applicable law or regulation.
- Attempt to disrupt, overload or gain unauthorised access to the Site or its infrastructure.
- Scrape, copy or redistribute the Site’s content, code or design for commercial purposes without prior written permission.
- Misrepresent results from the Site as certified, tested or professionally verified engineering data.
6. Intellectual Property
The Site’s content and design — including calculator code, text, diagrams, formula sheets, icons and the eCircuitCalc name and logo — are owned by eCircuitCalc or its licensors and are protected by applicable intellectual property laws. You may view, print and share links to individual pages for personal, non-commercial use. Any other reproduction or use requires our prior written consent.
7. Contact Form & Calculator Requests
The contact form lets you send messages and request new calculators. By submitting a message you:
- Grant us permission to store and use the information you provide to respond to you or develop the Site.
- Agree not to submit false, misleading, abusive or unlawful material.
Please do not send confidential or sensitive information through the contact form. We are not obligated to respond to any message, and calculator requests do not guarantee that a requested tool will be built.
8. Third-Party Services & External Links
The Site uses third-party services such as Google Analytics and Google Ads for analytics and advertising, as described in our Privacy Policy. Some pages may contain links to external websites. We do not control and are not responsible for the content, policies or practices of any third-party site or service.
9. Disclaimer of Warranties
THE SITE AND ALL CALCULATORS, RESULTS AND CONTENT ARE PROVIDED “AS IS” AND “AS AVAILABLE” WITHOUT WARRANTIES OF ANY KIND, EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO WARRANTIES OF ACCURACY, RELIABILITY, MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NON-INFRINGEMENT. WE DO NOT WARRANT THAT THE SITE WILL BE UNINTERRUPTED, ERROR-FREE OR FREE OF HARMFUL COMPONENTS.
10. Limitation of Liability
To the maximum extent permitted by law, eCircuitCalc and its operators shall not be liable for any direct, indirect, incidental, consequential, special or punitive damages — including damage to equipment, lost profits or project failure — arising from your use of, or inability to use, the Site or any information obtained from it, even if advised of the possibility of such damages.
11. Changes to These Terms
We may revise these Terms of Use from time to time. The “Last updated” date at the top of this page reflects the most recent revision. Continued use of the Site after changes take constitutes acceptance of the revised terms.
12. Contact
Questions about these Terms of Use can be sent via our contact page.