About ConvertPlus
Free, instant, and accurate conversions — no sign-up, no clutter.
ConvertPlus is a collection of free online converters for the things people actually need to convert: temperature between Celsius and Fahrenheit, Roman numerals in both directions, and everyday length, weight, and volume units — from cm to feet and kg to lbs to ml to oz.
Every calculation runs locally in your browser. There is no account, no upload, and no server round-trip: you type a value, and the answer appears instantly, along with the formula and a worked example so you can see exactly how the result was reached. That also means the converters work offline once the page has loaded.
Beyond the main converters, the site offers dedicated pages for the specific values people search for most — 40°C to °F, 37°C to °F, 350°F to °C, the 1-to-100 Roman numerals chart, and many more — each with a direct answer, a conversion table, and step-by-step math.
Contact
Questions, bug reports, or suggestions for a converter you wish existed? Email us at hello@convertplus.top and we will get back to you.