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Corrections are the most useful message you can send. If a calculator returned a wrong result, say which page, which values you entered and what you expected.
What to include in a report
- The page URL, and the values you entered, including units.
- What the tool returned, and what you expected instead.
- For a data problem: the country or device, and a link to a primary source if you have one (regulator, standards body, manufacturer datasheet).
- For a broken page: the link you followed, and the browser you used.
What gets fixed and what does not
- Calculation errors are treated as the highest priority: a wrong formula is a defect, not a content preference.
- Data corrections are applied once a primary source is available. Forum posts and retailer listings are not accepted as the sole basis for a voltage or plug claim.
- Product suggestions are not accepted as the basis for a recommendation. The site does not sell placements.
- Safety questions about a specific device cannot be answered by email. That requires the manufacturer's documentation and, where relevant, a qualified electrician.
No support inbox for hardware
This site does not repair, replace or warrant devices, and cannot mediate with a manufacturer. It is an information site: the tools compute from the numbers you provide.
Before you write
Many questions are already answered in how we calculate (formulas, efficiency assumptions, why results are ranges) or in the editorial policy (how sources are graded and how often data is reviewed).
Last reviewed 6 November 2026.