Free online unit converter
Convert any unit,
instantly.
Length, weight, temperature, volume, speed, data, time and currency. Formulas shown, tables included, nothing to install and nothing to sign up for.
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Practical tools
composite units, cooking, sizesFeet and inches to centimetersConvert a height like 5 ft 10 in to centimeters, or centimeters back to feet and inches, with a full height chart.Pounds and ounces to kilogramsConvert a weight given in pounds and ounces (baby weight, parcels) to kilograms and grams, and back.Hours and minutes to decimal hoursTurn 7 h 45 min into 7.75 hours for timesheets and payroll, or decimal hours back into hours and minutes.Cups to grams by ingredientFlour, sugar, butter, honey, oats and 20 more ingredients, each with its own density, spoons and metric cups included.Shoe and clothing size chartsMen's, women's and kids' shoes, women's and men's clothing, converted between US, UK and European labels and anchored on centimeters.Oven temperatures and gas marksGas mark to Celsius and Fahrenheit with the fan-oven equivalent, gas ¼ to 10, and the words cookbooks use.Paper sizes in mm, cm and inchesA, B and C series, Letter, Legal and Tabloid, with pixel sizes at 300 dpi and the √2 logic of the A series.px to rem converterPixels to rem and back at any root font size, with a table of common CSS values.PPI calculatorPixel density, dot pitch and physical size of a screen from its resolution and diagonal.
Browse by category
107 units / 12 categories01LengthMeters, feet, miles, kilometers and more12 units →02WeightKilograms, pounds, ounces, tons and more10 units →03TemperatureCelsius, Fahrenheit, Kelvin4 units →04AreaSquare meters, acres, hectares and more10 units →05VolumeLiters, gallons, cups, fluid ounces and more12 units →06Speedkm/h, mph, knots, mach and more7 units →07DataBytes, kilobytes, megabytes, gigabytes and more15 units →08TimeSeconds, minutes, hours, days and more12 units →09PressureBar, psi, pascal, atmospheres and more7 units →10EnergyJoules, calories, kWh, BTU and more8 units →11PowerWatts, kilowatts, horsepower and more6 units →12Fuel EconomyMPG, L/100km, km/L4 units →
107
units covered
1,000+
conversion pairs
6
significant digits
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