Convert any unit of measurement
Length, weight, volume, temperature, energy, pressure and 127 categories in total, with formulas, tables and real-life examples for every unit.
Popular conversions
- Centimeters to inches
- Inches to centimeters
- Meters to feet
- Feet to meters
- Kilometers to miles
- Miles to kilometers
- Kilograms to pounds
- Pounds to kilograms
- Grams to ounces
- Ounces to grams
- Pounds to ounces
- Ounces to pounds
- Degrees Celsius to degrees Fahrenheit
- Degrees Fahrenheit to degrees Celsius
- Degrees Celsius to kelvins
- Kelvins to degrees Celsius
- Degrees Fahrenheit to kelvins
- Kelvins to degrees Fahrenheit
- Celsius degrees to Fahrenheit degrees
- Fahrenheit degrees to Celsius degrees
- Kelvins to Fahrenheit degrees
- Fahrenheit degrees to kelvins
- Celsius degrees to kelvins
- Rankine degrees to kelvins
- Liters to gallons
- Gallons to liters
- Milliliters to fluid ounces
- Fluid ounces to milliliters
- Cups to milliliters
- Milliliters to cups
- Square meters to square feet
- Square feet to square meters
- Acres to hectares
- Hectares to acres
- Acres to square feet
- Square feet to acres
Calculators and tools
- Number to WordsSpell any number in English, for checks, essays and forms
- Fractions, Decimals & PercentFraction to decimal, decimal to fraction and percent conversions
- Time Zone ConverterEST, PST, IST, GMT, CET and more, with daylight saving
- Unix Timestamp ConverterEpoch time to date and date to epoch, with code examples
- Date CalculatorsDays until holidays, days from today, days between dates
- Oven Temperature GuideFahrenheit, Celsius, fan oven and gas mark chart
- Height ConverterFeet and inches to cm, and cm to feet and inches
- Stones and Pounds ConverterBody weight in stone and lb ↔ kg and pounds
- Percentage CalculatorPercent of a number, percent change, discounts
All categories
Everyday
- Length / DistanceMeters, feet, inches, miles and more231 units
- Mass / WeightKilograms, pounds, ounces, grams and more175 units
- TemperatureCelsius, Fahrenheit, Kelvin and more17 units
- Temperature DifferenceTemperature changes in °C, °F and K9 units
- Volume / CapacityLiters, gallons, cups, cubic meters and more234 units
- AreaSquare meters, acres, hectares, square feet and more112 units
- Time / DurationSeconds, minutes, hours, days, years and more101 units
- Velocity / Speedkm/h, mph, m/s, knots, Mach and more44 units
- Ratio / FractionPercent, per mille, ppm, ppb and more11 units
- Fuel Economympg, L/100 km, km/L and more14 units
- EV EfficiencykWh/100 km, mi/kWh, MPGe and more7 units
- Pacemin/km, min/mile, km/h and more13 units
Science & engineering
- Energy / Work / HeatJoules, calories, kWh, BTU and more99 units
- Pressure / StressPascals, bar, psi, atm, mmHg and more46 units
- PowerWatts, kilowatts, horsepower, BTU/h and more32 units
- ForceNewtons, pound-force, kilogram-force and more18 units
- Accelerationm/s², g-force, ft/s², gal and more16 units
- FrequencyHertz, kHz, MHz, GHz, rpm and more24 units
- Torque / MomentNewton meters, pound-feet and more17 units
- AnglesDegrees, radians, gradians, mils and more24 units
- Angular Velocityrpm, rad/s, degrees per second and more15 units
- Densitykg/m³, g/cm³, lb/ft³ and more18 units
- Volumetric Flow RateL/min, gpm, m³/h, cfm and more30 units
- Mass Flow Ratekg/s, kg/h, lb/h, t/h and more14 units
- Wavelength, Frequency & Photon Energynm ↔ THz ↔ eV and more20 units
- Surface TensionN/m, dyn/cm, mN/m and more7 units
- Sound Level / DecibelsDecibels, bels, nepers and ratios6 units
- Specific Heat CapacityJ/(kg·K), cal/(g·°C), BTU/(lb·°F)8 units
- Dynamic ViscosityPa·s, poise, centipoise and more11 units
- Kinematic ViscosityStokes, centistokes, m²/s and more9 units
- Momentum / Impulsekg·m/s, N·s, lb·ft/s and more9 units
Technology
- Information / DataBits, bytes, MB, GB, TB, GiB and more64 units
- Data Transfer RateMbps, MB/s, Gbps and more27 units
- TypographyPoints, picas, pixels, ems and more28 units
Electricity & magnetism
- Electric ChargeCoulombs, amp-hours, mAh and more17 units
- Electric CurrentAmperes, milliamps, microamps and more11 units
- VoltageVolts, millivolts, kilovolts and more8 units
- CapacitanceFarads, µF, nF, pF and more11 units
- Electrical ResistanceOhms, kΩ, MΩ and more10 units
- Electrical ConductanceSiemens, mS, µS, mho7 units
- InductanceHenries, mH, µH, nH8 units
- Electrical ResistivityΩ·m, Ω·cm, µΩ·cm and more7 units
- Magnetic FluxWebers, maxwells and more6 units
- Electrical ConductivityS/m, µS/cm, mS/cm and more7 units
- Magnetic Flux DensityTeslas, gauss and more12 units
- Magnetic Field StrengthA/m, oersteds and more6 units
Chemistry
- Amount of SubstanceMoles, millimoles, pound-moles and more13 units
- Molarity / Concentrationmol/L, mM, µM, nM and more11 units
- Catalytic ActivityKatals and enzyme units7 units
Heat & light
- Thermal ConductivityW/(m·K), BTU/(h·ft·°F) and more7 units
- Thermal Resistance (R-Value)US R-value, RSI, clo, tog4 units
- Heat Transfer Coefficient (U-Value)W/(m²·K), BTU/(h·ft²·°F)6 units
- Heat Flux / IrradianceW/m², BTU/(h·ft²), suns and more8 units
- IlluminanceLux, foot-candles and more6 units
- LuminanceNits (cd/m²), foot-lamberts and more7 units
- Luminous IntensityCandelas, candlepower and more7 units
- Luminous FluxLumens and candela-steradians5 units
Radiation
- RadioactivityBecquerels, curies and more16 units
- Radiation Dose (Absorbed)Grays, rads and more10 units
- Radiation Dose (Equivalent)Sieverts, rem and more9 units
Cooking & baking
- All-Purpose FlourCups, spoons and grams of flour12 units
- Almond FlourCups, spoons and grams of almond flour12 units
- ApplesauceCups, spoons and grams of applesauce12 units
- Baking PowderCups, spoons and grams of baking powder12 units
- Baking SodaCups, spoons and grams of baking soda12 units
- Bread FlourCups, spoons and grams of bread flour12 units
- Brown SugarCups, spoons and grams of brown sugar12 units
- ButterCups, spoons and grams of butter13 units
- ButtermilkCups, spoons and grams of buttermilk12 units
- Cake FlourCups, spoons and grams of cake flour12 units
- Chocolate ChipsCups, spoons and grams of chocolate chips12 units
- Chopped PecansCups, spoons and grams of pecans12 units
- Chopped WalnutsCups, spoons and grams of walnuts12 units
- Cocoa PowderCups, spoons and grams of cocoa12 units
- Coconut OilCups, spoons and grams of coconut oil12 units
- Corn SyrupCups, spoons and grams of corn syrup12 units
- CornmealCups, spoons and grams of cornmeal12 units
- CornstarchCups, spoons and grams of cornstarch12 units
- Cream CheeseCups, spoons and grams of cream cheese12 units
- Dried CranberriesCups, spoons and grams of dried cranberries12 units
- Granulated SugarCups, spoons and grams of sugar12 units
- Grated ParmesanCups, spoons and grams of parmesan12 units
- Greek YogurtCups, spoons and grams of Greek yogurt12 units
- Ground CinnamonCups, spoons and grams of cinnamon12 units
- Heavy CreamCups, spoons and grams of cream12 units
- HoneyCups, spoons and grams of honey12 units
- Instant YeastCups, spoons and grams of yeast12 units
- Kosher Salt (Diamond Crystal)Cups, spoons and grams of kosher salt12 units
- Maple SyrupCups, spoons and grams of maple syrup12 units
- Mashed BananaCups, spoons and grams of mashed banana12 units
- MilkCups, spoons and grams of milk12 units
- MolassesCups, spoons and grams of molasses12 units
- Oat FlourCups, spoons and grams of oat flour12 units
- Olive OilCups, spoons and grams of olive oil12 units
- Peanut ButterCups, spoons and grams of peanut butter12 units
- Powdered SugarCups, spoons and grams of powdered sugar12 units
- Pumpkin PureeCups, spoons and grams of pumpkin puree12 units
- Quinoa (Uncooked)Cups, spoons and grams of quinoa12 units
- RaisinsCups, spoons and grams of raisins12 units
- RicottaCups, spoons and grams of ricotta12 units
- Rolled OatsCups, spoons and grams of oats12 units
- Rye FlourCups, spoons and grams of rye flour12 units
- Self-Rising FlourCups, spoons and grams of self-rising flour12 units
- SemolinaCups, spoons and grams of semolina12 units
- Sesame SeedsCups, spoons and grams of sesame seeds12 units
- Shredded CheeseCups, spoons and grams of shredded cheese12 units
- Shredded CoconutCups, spoons and grams of shredded coconut12 units
- Sliced AlmondsCups, spoons and grams of sliced almonds12 units
- Sour CreamCups, spoons and grams of sour cream12 units
- Sweetened Condensed MilkCups, spoons and grams of condensed milk12 units
- Table SaltCups, spoons and grams of salt12 units
- Turbinado SugarCups, spoons and grams of turbinado sugar12 units
- Vegetable OilCups, spoons and grams of oil12 units
- Vegetable ShorteningCups, spoons and grams of shortening12 units
- WaterCups, spoons and grams of water12 units
- White Rice (Uncooked)Cups, spoons and grams of rice12 units
- Whole Wheat FlourCups, spoons and grams of whole wheat flour12 units
- YogurtCups, spoons and grams of yogurt12 units
Numbers
Sizes
- Shoe SizesUS, UK, EU, Japan and foot length11 units
- Ring SizesUS, EU/ISO, Swiss and diameter6 units
- Women's Dress SizesUS, UK, EU, France, Italy, Japan6 units
- Men's Suit & Jacket SizesUS/UK, EU/Italian, chest in cm3 units
- Men's Shirt SizesCollar size in inches and cm2 units
- Men's Pants SizesWaist in inches, cm and EU sizes3 units
- Bra Band SizesUS/UK, EU, FR, IT, AU bands5 units
- Hat SizesUS, UK, EU and head circumference4 units
Frequently asked questions
What is a unit converter?
A unit converter turns a measurement in one unit into the same measurement in another unit, for example centimeters into inches or Celsius into Fahrenheit. Convert-Top covers 127 categories of measurement, from everyday length and weight to niche scientific and historical units.
How accurate are the conversions?
Conversion factors come from the official definitions of each unit (SI, NIST and international agreements). Results are calculated at full double precision and shown rounded to 10 significant figures.
Is it free?
Yes. Every converter, table and reference page is free to use with no sign-up.