Unit converters
Convert everyday and scientific units. Common: Length converter, Weight converter, Temperature converter, Volume converter, Speed converter and Area converter. Technical: Pressure converter, Energy converter, Power converter, Data storage converter, Voltage converter and Ohms law calculator. Kitchen: Cooking converter, Recipe scaler, Oven temperature converter, Pizza dough calculator and Sous vide time and temperature. Sizes: Shoe size converter, Ring size converter, Clothing size converter and Paper size converter.
- ABV calculatorAlcohol by volume from original gravity and final gravity, with the standard formula and a higher-gravity alternative.
- Acceleration converterm/s², g-force, ft/s², Gal, km/h per second and mph per second.
- Angle converterDegrees, radians, gradians, arcminutes, arcseconds, turns and NATO mils.
- Angular velocity converterrad/s, rpm, rev/s, degrees per second and per minute.
- Area converterSquare meters and feet, acres, hectares, square kilometers and miles.
- Astronomical distance converterkm, au, light-seconds, light-minutes, light-years, parsecs, kpc and Mpc.
- Baker's percentage calculatorIngredient weights to baker's percentages and back, with hydration, salt and yeast as a percent of the flour weight.
- Baking pan size converterCompares the area of two pans and gives the factor to scale a recipe when you change the pan.
- Battery life calculatorRuntime in hours and days from battery capacity, load current and a usable-capacity factor.
- Bread hydration calculatorTrue dough hydration counting the flour and water in a sourdough starter, or the water to add for a target hydration.
- Brine ratio calculatorGrams of salt for a wet brine by percent, an equilibrium brine by total weight or a dry brine by food weight.
- Candy temperature guideSugar stages from thread to caramel in °C and °F, what each makes, with an altitude adjustment of about 1 °F per 500 ft.
- Capacitance converterFarads, mF, µF, nF and pF for capacitors.
- Clothing size converterWomen's and men's top and dress sizes across US, UK, EU, IT, FR and JP from standard charts.
- Coffee ratio calculatorGrams of coffee for a given amount of water (or the reverse) at a typical ratio for the brewing method you choose.
- Concentration convertermg/L, g/L, μg/mL, mg/dL, ppm, ppb and % w/v for dilute water-like solutions.
- Conductance converterSiemens, mho, mS, µS, nS, kS, abmho and statmho.
- Cooking converterUS cups, metric cups, tablespoons, teaspoons, fluid ounces and milliliters.
- Oven temperature converterCelsius, Fahrenheit, UK gas mark and fan oven temperatures with oven descriptions.
- Data storage converterBits, bytes, decimal KB/MB/GB/TB and binary KiB/MiB/GiB/TiB side by side.
- Data transfer rate converterbit/s, Mbit/s, Gbit/s, MB/s, GB/s and the binary KiB/s, MiB/s.
- Decibel converterdB to power and voltage ratios and nepers; dBm, dBW, dBV and dBu to watts and volts.
- Density converterkg/m³, g/cm³, g/L, pounds per cubic foot, cubic inch and US gallon.
- Download time calculatorHow long a file takes to download from its size and your speed, with bit/byte and MB/MiB handled.
- Electric charge converterCoulombs, mAh, Ah, faraday constant and elementary charge.
- Electric current converterAmperes, mA, µA, kA, abampere and statampere.
- Electric field strength converterV/m, kV/m, MV/m, V/cm, kV/cm, V/mm, kV/mm, N/C, V/in and statV/cm.
- Electrical resistance converterOhms, mΩ, kΩ, MΩ, GΩ, abohm and statohm.
- Electricity cost calculatorkWh and running cost per day, month and year from watts, hours and your price per kWh.
- Energy converterJoules, kJ, Wh, kWh, calories, kilocalories, BTU, foot-pounds and eV.
- Flow rate converterm³/s, L/s, L/min, m³/h, US gallons per minute, ft³/min and ft³/s.
- Force converterNewtons, kN, MN, dynes, pounds-force, kilograms-force and poundals.
- Frequency converterHz, kHz, MHz, GHz, THz, revolutions per minute and radians per second.
- Fuel economy converterL/100 km, mpg (US), mpg (UK) and km/L, converted with the correct reciprocal.
- Hat size converterHead circumference in cm or inches to US, UK and EU fitted hat sizes, with approximate S/M/L.
- Heat flux converterW/m², kW/m², W/cm², BTU/(h·ft²), cal/(s·cm²) and kcal/(h·m²).
- Illuminance converterLux, kilolux, foot-candles, phot and nox for light levels on a surface.
- Inductance converterHenries, mH, µH, nH and pH for coils and chokes.
- Ingredient converterCups, tablespoons and teaspoons to grams and ounces (and back) for 41 common baking ingredients.
- kVA to kW calculatorConvert between apparent power (kVA) and real power (kW) using the power factor, with reactive power in kvar.
- Length converterMeters, feet, inches, centimeters, kilometers, miles and more.
- Linear density converterTex, dtex, denier, kg/m, g/m, g/km, lb/ft and lb/yd.
- Magnetic field converterMagnetic flux density in tesla, gauss, mT, μT, nT and gamma.
- mAh to Wh converterBattery capacity in mAh to watt-hours, kWh, joules and ampere-hours at a given voltage.
- Mass flow rate converterkg/s, g/s, kg/min, kg/h, t/h, t/day, lb/s, lb/min, lb/h and short tons per hour.
- Mattress size chartUS, UK, EU and Australian bed sizes in centimetres and inches.
- Meat cooking time calculatorEstimated oven roasting time for a beef, pork or lamb roast or a whole chicken by weight, with the USDA safe internal temperature.
- Meat thawing time calculatorHow long frozen meat or poultry takes to thaw in the refrigerator or in cold water, by weight, following USDA guidance.
- Moment of inertia converterkg·m², g·cm², kg·cm², lb·ft², lb·in², oz·in² and slug·ft².
- Ohm's law calculatorEnter any two of V, I, R and P to find the other two, with SI prefixes such as k and m.
- Paper size converterISO A, B, C and US paper sizes in mm, cm, inches, points and pixels at any DPI.
- Paper weight converterg/m² (GSM) and US pound weights of bond, text/book, cover, index and bristol paper.
- Pizza dough calculatorGrams of flour, water, salt and yeast for a number of pizza dough balls at the hydration you choose.
- Power converterWatts, kW, MW, mechanical and metric horsepower, BTU/h and foot-pounds per second.
- PPI calculatorPixel density, dot pitch, aspect ratio and physical size from resolution and diagonal.
- Pressure converterpsi, bar, pascals, kPa, atmospheres, torr, mmHg and inHg.
- PX to REM converterConvert pixels, rem, em, points and percent for CSS font sizes with an adjustable base size.
- Radiation dose converterGray, rad, sievert and rem with milli and micro prefixes, one quantity at a time.
- RC time constant calculatorRC time constant, cutoff frequency and charge times from a resistor and capacitor.
- Recipe scalerPaste ingredient lines and scale their quantities by servings or a multiplier, with kitchen fractions in the result.
- Resistor parallel and series calculatorTotal resistance of resistors connected in series or in parallel, with SI prefixes such as k and M.
- Ring size converterUS, UK letters, EU, Japan sizes, inner diameter and circumference in mm, with the nearest standard size.
- Shoe size converterUS men, US women, UK, EU and length in cm, from documented formulas.
- Sourdough starter calculatorGrams of starter, flour and water for feeding ratios like 1:1:1, 1:2:2 and 1:5:5, from the starter you have or the total you want.
- Sous vide time and temperatureCommon sous vide bath temperatures for steak, pork, chicken and salmon, plus how long a cut of a given thickness takes to heat through.
- Specific heat converterJ/(kg·K), kJ/(kg·K), J/(g·K), cal/(g·°C), kcal/(kg·°C) and BTU/(lb·°F).
- Speed converterkm/h, mph, m/s, knots and ft/s, plus the speed of light.
- Surface tension converterN/m, mN/m, dyn/cm, lbf/ft and lbf/in.
- Temperature converterCelsius, Fahrenheit, Kelvin and Rankine, with the formulas spelled out.
- Temperature difference converterA change or interval in K, °C, °F and °R, without the 32-degree offset.
- Thermal conductivity converterW/(m·K), W/(cm·K), kcal/(h·m·°C), cal/(s·cm·°C), BTU·in/(h·ft²·°F) and BTU/(h·ft·°F).
- Time converterNanoseconds to millennia, with the month and year defined as averages.
- Torque converterN·m, kN·m, pound-feet, pound-inches, kgf·m and ounce-force inches.
- Turkey cooking time calculatorRoasting time for a whole turkey at 325 °F by weight, stuffed or unstuffed, from the USDA roasting chart.
- Typography converterPoints, picas, px, inches, mm, cm and em/rem with a base font size.
- Viscosity converterDynamic viscosity in Pa·s, mPa·s, poise, centipoise and lbf·s/ft².
- Voltage converterVolts, mV, µV, kV, MV, abvolt and statvolt.
- Voltage divider calculatorOutput voltage of a two-resistor divider, or the R1 or R2 that gives a target voltage.
- Volume converterLiters, milliliters, US and imperial gallons, quarts, pints, cups, cubic meters and feet.
- Water for rice calculatorTypical water to rice ratios for white, jasmine, basmati, short-grain, brown and wild rice, on the stovetop or in a rice cooker.
- Wavelength ↔ frequency converterλ = v / f in vacuum or any medium, with period and photon energy E = hf.
- Weight converterKilograms, grams, pounds, ounces, stones, metric and US tons.
- Yeast conversion calculatorConverts grams of instant, active dry and fresh yeast into each other with the usual rules of thumb.