Science, Units & Digital Calculators
Conversions, chemistry, weather and web.
Convert units of every kind, compute density, molarity and half-life, estimate wind chill and dew point, and handle digital tasks like Base64, subnets and DPI.
Aspect Ratio CalculatorFind a width or height that keeps a target aspect ratio.Bandwidth CalculatorEstimate how long a file takes to transfer at a given speed.Base64 Encode / Decode CalculatorEncode text to Base64 or decode Base64 back to plain text.Carbon Footprint CalculatorEstimate monthly CO2 emissions from energy use and travel.Conversion CalculatorConvert a value between units within length, mass, volume, area, speed, data, energy or pressure.Cooking Measurement ConverterConvert recipe amounts between cups, spoons, ml, grams and ounces.Data Storage ConverterConvert digital storage between bits, bytes, KB, MB, GB and more.Density CalculatorSolve for density, mass or volume using ρ = m / V.Dew Point CalculatorCalculate the dew point from air temperature and relative humidity.Half-Life CalculatorFind how much of a substance remains after a given time using its half-life.Heat Index CalculatorCalculate the "feels like" heat index from temperature and relative humidity.Ideal Gas Law CalculatorSolve PV = nRT for pressure, volume, moles or temperature.IP Subnet CalculatorFind the network, broadcast, host range and mask for a subnet.Length ConverterConvert a length between metric and imperial units.Mass CalculatorCalculate mass from density × volume, or from force ÷ acceleration.Molarity CalculatorSolve for molarity, moles or volume using M = moles / litres.Molecular Weight CalculatorFind the molar mass of a compound from its chemical formula.Password GeneratorGenerate a random password from chosen character sets.pH CalculatorCalculate pH from hydrogen-ion concentration, or the concentration from a pH.Pixel / DPI CalculatorRelate pixels, DPI and print size, and solve for any one.Projectile Motion CalculatorFind the range, maximum height and flight time of a projectile.Speed CalculatorCalculate average speed from a distance and a time.Temperature ConverterConvert temperatures between Celsius, Fahrenheit and Kelvin.URL Encode / Decode CalculatorPercent-encode text for URLs or decode an encoded string.Weight CalculatorCalculate weight (force) from mass and gravity: W = m·g.Wind Chill CalculatorCalculate the National Weather Service wind chill from temperature and wind speed.