Drugs.com Interaction Checker
drugs.com
Lists the interactions between the medicines, supplements and alcohol you enter
No sign-up
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metric-conversions.org
Converts between metric and imperial units and shows the working formula.
A plain set of conversion tables and calculators covering length, weight, volume, temperature, area, speed, pressure and the awkward cooking units, with the formula and a reference table printed under each result. The pages load instantly and are stable URLs, so a specific conversion can be bookmarked. It does exactly one thing, which is why it is faster than asking a search engine.
AltFTool does this too
If you would rather not leave the site, Unit Converter covers the same job here — free, no account, and it runs in your browser.
Open Unit ConverterQuestions
Works the moment the page loads. No account, no email, no trial. Physical units only — no currency, no time zones — and the pages are ad-supported.
Yes. Metric Conversions sends your input to its own servers to process it. That is fine for public material; for anything containing personal data, use one of the on-device tools instead.
Physical units only — no currency, no time zones — and the pages are ad-supported.
Alternatives
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drugs.com
Lists the interactions between the medicines, supplements and alcohol you enter
exrx.net
An exercise library that names the muscles each movement actually works
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The USDA's laboratory-measured nutrient data for tens of thousands of foods
kingarthurbaking.com
Gives the gram weight of a cup of every baking ingredient you are likely to use
medlineplus.gov
Plain-language health information from the US National Library of Medicine
omnicalculator.com
Around 3,000 small calculators, each with the formula shown underneath