# UnitConverter > Free browser-based unit converters. Each page converts one unit pair, shows > the formula and the exact factor used, and a worked example. No sign-up, no > ads in front of the result. The site is funded by advertising, which is kept > below the answer. Every conversion factor is the defining international standard for that unit, listed at /methodology/. Nothing on this site is estimated or invented. Temperature is the one dimension where a conversion is not a single multiplication: Celsius, Fahrenheit and Kelvin put their zero in different places, so the formula shifts as well as scales. Volume pages use US customary units (US cup, US fluid ounce, US liquid gallon) by default, and each page states the Imperial difference. ## Converters ### Weight - [All weight converters](https://unitconverterone.com/weight/) - [Grams to Pounds](https://unitconverterone.com/grams-to-pounds/) - [Pounds to Ounces](https://unitconverterone.com/lbs-to-oz/) - [Pounds to Kilograms](https://unitconverterone.com/lbs-to-kg/) - [Kilograms to Pounds](https://unitconverterone.com/kg-to-lbs/) - [Kilograms to Stone](https://unitconverterone.com/kg-to-stone/) - [Ounces to Grams](https://unitconverterone.com/oz-to-grams/) - [Pounds to Stone](https://unitconverterone.com/lbs-to-stone/) - [Stone to Pounds](https://unitconverterone.com/stone-to-lbs/) - [Stone to Kilograms](https://unitconverterone.com/stone-to-kg/) - [Grams to Ounces](https://unitconverterone.com/grams-to-ounces/) - [Kilograms to Grams](https://unitconverterone.com/kg-to-grams/) - [Pounds to Grams](https://unitconverterone.com/lbs-to-grams/) ### Volume - [All volume converters](https://unitconverterone.com/volume/) - [Milliliters to Ounces](https://unitconverterone.com/ml-to-oz/) - [Ounces to Cups](https://unitconverterone.com/ounces-to-cups/) - [Quarts to Gallons](https://unitconverterone.com/quarts-to-gallons/) - [Liters to Gallons](https://unitconverterone.com/liters-to-gallons/) - [Ounces to Milliliters](https://unitconverterone.com/oz-to-ml/) - [Gallons to Liters](https://unitconverterone.com/gallons-to-liters/) - [Cups to Milliliters](https://unitconverterone.com/cups-to-ml/) - [Milliliters to Liters](https://unitconverterone.com/ml-to-liters/) - [Liters to Milliliters](https://unitconverterone.com/liters-to-ml/) - [Milliliters to Cups](https://unitconverterone.com/ml-to-cups/) - [Tablespoons to Milliliters](https://unitconverterone.com/tablespoons-to-ml/) - [Milliliters to Tablespoons](https://unitconverterone.com/ml-to-tablespoons/) - [Teaspoons to Milliliters](https://unitconverterone.com/teaspoons-to-ml/) - [Milliliters to Teaspoons](https://unitconverterone.com/ml-to-teaspoons/) - [Pints to Cups](https://unitconverterone.com/pints-to-cups/) - [Cups to Pints](https://unitconverterone.com/cups-to-pints/) - [Cups to Ounces](https://unitconverterone.com/cups-to-oz/) - [Gallons to Quarts](https://unitconverterone.com/gallons-to-quarts/) ### Length - [All length converters](https://unitconverterone.com/length/) - [Feet to Centimeters](https://unitconverterone.com/feet-to-cm/) - [Centimeters to Inches](https://unitconverterone.com/cm-to-inches/) - [Inches to Centimeters](https://unitconverterone.com/inches-to-cm/) - [Meters to Feet](https://unitconverterone.com/meters-to-feet/) - [Feet to Meters](https://unitconverterone.com/feet-to-meters/) - [Kilometers to Miles](https://unitconverterone.com/km-to-miles/) - [Miles to Kilometers](https://unitconverterone.com/miles-to-km/) - [Millimeters to Inches](https://unitconverterone.com/mm-to-inches/) - [Inches to Millimeters](https://unitconverterone.com/inches-to-mm/) - [Centimeters to Feet](https://unitconverterone.com/cm-to-feet/) - [Inches to Feet](https://unitconverterone.com/inches-to-feet/) - [Feet to Inches](https://unitconverterone.com/feet-to-inches/) ### Area - [All area converters](https://unitconverterone.com/area/) - [Square Meters to Square Feet](https://unitconverterone.com/square-meters-to-square-feet/) - [Square Feet to Square Meters](https://unitconverterone.com/square-feet-to-square-meters/) - [Acres to Square Feet](https://unitconverterone.com/acres-to-square-feet/) - [Square Feet to Acres](https://unitconverterone.com/square-feet-to-acres/) - [Hectares to Acres](https://unitconverterone.com/hectares-to-acres/) - [Acres to Hectares](https://unitconverterone.com/acres-to-hectares/) ### Temperature - [All temperature converters](https://unitconverterone.com/temperature/) - [Celsius to Fahrenheit](https://unitconverterone.com/celsius-to-fahrenheit/) - [Fahrenheit to Celsius](https://unitconverterone.com/fahrenheit-to-celsius/) - [Celsius to Kelvin](https://unitconverterone.com/celsius-to-kelvin/) - [Kelvin to Celsius](https://unitconverterone.com/kelvin-to-celsius/) ### Speed - [All speed converters](https://unitconverterone.com/speed/) - [km/h to mph](https://unitconverterone.com/kmh-to-mph/) - [mph to km/h](https://unitconverterone.com/mph-to-kmh/) - [m/s to km/h](https://unitconverterone.com/ms-to-kmh/) - [km/h to m/s](https://unitconverterone.com/kmh-to-ms/) - [Knots to mph](https://unitconverterone.com/knots-to-mph/) - [Knots to km/h](https://unitconverterone.com/knots-to-kmh/) ## Guides Long-form explanations of a conversion: the formula and why it works, oven and air-fryer temperature tables, and charts you can read a value off. Every figure in every guide is computed from the same engine as the converters, and each guide links back to the converter it explains. - [All conversion guides](https://unitconverterone.com/blog/) - [Speed limits in km/h and mph](https://unitconverterone.com/blog/speed-limits-kmh-to-mph/) — Every European speed limit from 30 to 130 km/h in mph, with the US and UK limits going the other way, and why the round numbers on a sign never are. - [Height conversion chart](https://unitconverterone.com/blog/height-conversion-chart/) — A height chart from 150 cm to 200 cm in feet and inches, and 4 ft 6 in to 6 ft 6 in back to cm. Every figure computed from the exact 2.54 cm inch. - [Stone to kg chart](https://unitconverterone.com/blog/stone-to-kg-chart/) — A stone to kg chart from 8 to 20 stone, the pounds alongside every row, and the half-stone entries scales and weight charts actually use. - [How many mL in a cup](https://unitconverterone.com/blog/how-many-ml-in-a-cup/) — A US cup is 236.6 mL, a metric cup is 250 mL, and a UK cup is 284 mL. See which one a recipe means, with a chart and the exact formula. - [How many cups in a quart](https://unitconverterone.com/blog/how-many-cups-in-a-quart/) — A US quart is exactly 4 cups. A chart of gallons, quarts, pints and cups, the bigger UK quart, metric cups, and why a quart of berries is not 4 cups. - [How many mL in an ounce](https://unitconverterone.com/blog/how-many-ml-in-an-ounce/) — One US fluid ounce is 29.57 mL and a UK one is 28.41 mL. A chart from 1 to 64 oz in both, common can and bottle sizes, and when an ounce is really a weight. - [The Celsius to Fahrenheit formula](https://unitconverterone.com/blog/celsius-to-fahrenheit-formula/) — How to convert Celsius to Fahrenheit: multiply by 1.8, add 32, and why the formula works that way. Worked examples and the step-versus-reading trap. - [Oven temperature conversion](https://unitconverterone.com/blog/oven-temperature-conversion/) — Convert oven temperatures between Celsius, Fahrenheit and gas marks, with the fan-oven adjustment and the baking temperatures recipes actually use. - [Celsius to Fahrenheit chart](https://unitconverterone.com/blog/celsius-to-fahrenheit-chart/) — A complete Celsius to Fahrenheit chart from −40 to 300, with a live converter, the exact formula and the values people look up most. - [Air fryer temperature conversion](https://unitconverterone.com/blog/air-fryer-temperature-conversion/) — How to convert an oven recipe to an air fryer: the temperature and time adjustments, the °C and °F starting points, and where the rule stops working. ## Reference - [Home](https://unitconverterone.com/) — the converter index, every category and every published pair on one page. - [Conversion methodology](https://unitconverterone.com/methodology/) — every factor, its source and the rounding rule. - [About](https://unitconverterone.com/about/) - [Contact](https://unitconverterone.com/contact/) - [Sitemap](https://unitconverterone.com/sitemap.xml) - [Guides feed](https://unitconverterone.com/rss.xml) ## Policies - [Privacy policy](https://unitconverterone.com/privacy/) - [Cookie policy](https://unitconverterone.com/cookies/) - [Terms of use](https://unitconverterone.com/terms/) - [Disclaimer](https://unitconverterone.com/disclaimer/) — what these results are not suitable for.