Precision unit conversion
ConvertDial is a free, no-signup unit conversion tool covering everyday categories like length, weight, temperature, volume, speed, area, data storage, pressure, and more — plus handy extras like number base conversion, oven/gas mark lookups, and a constants reference.
The goal is simple: fast, accurate conversions without clutter, accounts, or paywalls. Enter a value, pick your units, get an answer — including support for both US and UK measurement variants and fraction/mixed-number input where it's useful (like 43 3/4 inches).
ConvertDial is built and maintained by an independent UK-based developer, also behind a handful of other free web tools, including:
These sites are kept free to use and are supported by advertising and a small amount of affiliate revenue.
ConvertDial is supported by Google-served ads and occasional affiliate links (including Amazon Associates), which help cover hosting and development time. This doesn't affect the accuracy of the conversions or add any cost for you.
Alongside the converter tool itself, the site has a growing set of reference pages and guides covering each conversion category in more depth — formulas, worked examples and answers to the questions that come up most often.