About this site

About Metric Conversion Tools

Metric Conversion Tools is a free, browser-based unit converter for the conversions people actually look up: kilometers and miles, kilograms and pounds, Celsius and Fahrenheit, liters and gallons, and the other everyday pairs between metric and US customary units.

The site exists because most conversion pages bury a one-line answer under slow scripts and intrusive layouts. Every converter here loads as a static page, runs the math locally in your browser, and shows the formula next to the result so you can check the work yourself.

Where the conversion factors come from

The factors used by the calculator are the exact values fixed by international agreement, not approximations:

• One inch is exactly 2.54 centimeters and one mile is exactly 1,609.344 meters, as defined by the 1959 international yard and pound agreement.
• One pound (avoirdupois) is exactly 0.45359237 kilograms, from the same agreement.
• Temperature conversions use the exact relation °F = °C × 9/5 + 32.
• US liquid measures derive from the US gallon of exactly 3.785411784 liters.

These are the same definitions published by national measurement institutes such as NIST in the United States. Because they are definitions rather than measurements, they do not drift over time.

How results are calculated and rounded

Each conversion passes through a single base unit — meters for length, kilograms for mass, liters for volume — and is rounded only at the final display step. The displayed result keeps enough significant digits for everyday use; the reference tables on each converter page show the rounding applied. The formula line under every result states the exact factor used, so nothing is hidden in the rounding.

Who runs the site

Metric Conversion Tools is built and maintained by an independent developer as a small, focused utility. There is no editorial team, no sponsored content, and no paid placement in the results. The site is supported by advertising, which is labeled and kept out of the calculator itself.

Corrections

If you spot a wrong factor, a rounding error, or a table value that does not match the formula, please get in touch. Accuracy reports are the most useful feedback a conversion site can get, and they are fixed with priority.