About Panglify
Panglify is a free, independent collection of unit converters and calculators, built to be the clearest and most accurate place on the web to convert anything.
What Panglify is
Panglify brings together converters and calculators for everyday life, school and work: length, weight, temperature, data storage, pressure, cooking, currency, time zones and more, across 25 categories. Every tool is free to use, needs no account and works on any device.
How we make every conversion exact
Each converter is built on the internationally agreed definition of its units rather than rounded rules of thumb. The inch is exactly 2.54 centimeters, the pound is exactly 0.45359237 kilograms and the US gallon is exactly 3.785411784 liters, and our calculators keep full precision until the final digit. Our primary references are:
- the BIPM SI Brochure (the International System of Units);
- NIST Special Publication 811 and NIST Handbook 44 from the US National Institute of Standards and Technology;
- the 1959 International Yard and Pound Agreement;
- IEC 80000-13 for binary data prefixes (KiB, MiB, GiB), and the IANA time zone database for time zones.
We show the formula on every tool page, with worked examples, so you can check the math yourself and learn it. Where a value cannot be exact (a cup of flour in grams, a shoe size across brands, tons of gravel per cubic yard) we say so clearly and give typical values.
How we build and review each page
The full detail, including the exact value of every unit we use and how results are rounded, is on our how we verify page.
- We take the conversion factors from the primary sources above.
- We compute every table and example with code, never by hand.
- We test each calculator against independent reference values before publishing.
- We review pages regularly and update them when standards or best practice change. Each page shows the date it was last updated.
Built for people
Panglify is designed to be fast, calm and uncluttered. Results appear as you type, pages load quickly on slow connections and everything runs in your browser. We do not ask for sign-ups, and we do not store the values you type.
How Panglify is funded
Panglify is free because it may be supported by advertising. Ads will never change a result, and we keep them clearly separate from the tools themselves.
Get in touch
Spotted an error, or want a converter we don't have yet? We read every message. Visit our contact page, and see our privacy policy and terms of use for the details.