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Popular Converters workflows

Direct links to four high-demand tools in this category.

Ft Lb To NmNm To Ft LbRoman Numeral ConverterMeters To Miles
134 tools

Converters

Pair converters include reverse, precision, and reference support, while multi-unit tools remain the better choice for broad conversion work.

Primary conversion workflows

Start with the twelve flagship converters

Use a broad measurement converter when the unit pair can change, or jump directly to the most common metric/imperial pairs. The specialist catalog below remains for engineering, storage, cooking, notation, currency and other distinct dimensions.

Unit ConverterAll-in-one measurement conversionLength ConverterMetric and imperial length unitsWeight ConverterMass and weight unitsTemperature ConverterCelsius, Fahrenheit and KelvinInches → CMExact 2.54 conversionCM → InchesReverse exact length conversionKG → LBSKilograms to poundsLBS → KGPounds to kilograms°F → °CFahrenheit to Celsius°C → °FCelsius to FahrenheitMiles → KMMiles to kilometersKM → MilesKilometers to miles
Accuracy boundary: exact defined factors are labeled as exact. Temperature scales use offset formulas, not a single multiplication ratio. Display rounding never increases source measurement accuracy.

Convert → verify formula → reverse-check → compare reference values

Pair converters include reverse, precision, and reference support, while multi-unit tools remain the better choice for broad conversion work.

Popular measurement pairs

Fast pair-specific pages for common metric, imperial and US customary conversions.

CM to Inches ConverterEnter centimeters to get inches using the exact 2.54 cm per inch conversion.Inches to CM ConverterEnter inches to get centimeters using the exact 2.54 cm per inch conversion.KG to LBS ConverterEnter kilograms to convert to pounds.LBS to KG ConverterEnter pounds to convert to kilograms.Miles to KM ConverterEnter miles to convert to kilometers.KM to Miles ConverterEnter kilometers to convert to miles.Feet to Meters ConverterEnter feet to convert using 1 foot = 0.3048 meters.Cups to ML ConverterEnter US customary cups to convert to milliliters.

Full-category converters

Use one workspace when you need to switch among many related units rather than one fixed pair.

Unit ConverterChoose a measurement type, enter either side, and get the other value instantly. Swap units or open the all-unit table for a broader comparison.Length ConverterConvert millimeters through miles and nautical miles without leaving the page, with a live all-units comparison table.Area ConverterConvert square metric units, square inches/feet/yards/miles, acres, and hectares with a live all-units table.Volume ConverterConvert liters, milliliters, cubic units, teaspoons, tablespoons, fluid ounces, cups, pints, quarts, and gallons.Weight ConverterConvert milligrams, grams, kilograms, tonnes, ounces, pounds, stone, and US/Imperial tons without confusing mass with pound-force or kilogram-force.Temperature ConverterTemperature conversion uses scale offsets rather than pretending every relationship is a simple multiplier.Speed ConverterConvert common road, scientific, and marine speed units with a live comparison table.Data Storage ConverterKeep SI decimal storage units and IEC binary storage units visibly separate so a conversion never silently changes conventions.

Specialized converters

Handle number systems, engineering notation, custom factors and generated reference tables.

Base ConverterConvert integer values across binary, octal, decimal, hexadecimal, or any custom base from 2 to 36.Binary ConverterEnter a binary or decimal value and convert it in either direction.Hex ConverterEnter a hex or decimal number and convert it in either direction.Engineering Notation ConverterExpress a number with an exponent divisible by three and show the matching SI prefix when one exists.SI Prefix ConverterConvert the same base quantity between decimal SI prefixes such as micro, milli, kilo, mega, giga, ronna, and quetta.Measurement Conversion Table GeneratorChoose a measurement type and unit pair, then generate a reusable conversion table across a start, end, and step without converting values one at a time.Custom Unit Ratio ConverterDefine a relationship such as 1 box = 24 items or 3 scoops = 50 grams, then convert either direction locally without pretending the units are standardized.

All Converters

Converters

Fahrenheit to Celsius Converter

Convert Fahrenheit to Celsius and Celsius to Fahrenheit instantly.

Converters

CM to Inches Converter

Convert centimeters to inches instantly.

Converters

Inches to CM Converter

Convert inches to centimeters instantly.

Converters

KG to LBS Converter

Convert kilograms to pounds instantly.

Converters

LBS to KG Converter

Convert pounds to kilograms instantly.

Converters

Miles to KM Converter

Convert miles to kilometers instantly.

Converters

KM to Miles Converter

Convert kilometers to miles instantly.

Converters

Meters to Feet Converter

Convert meters to feet instantly.

Converters

ML to Cups Converter

Convert milliliters to US cups instantly.

Converters

MM to Inches Converter

Convert millimeters to inches instantly.

Converters

Feet to Meters Converter

Convert feet to meters instantly.

Converters

Meters to CM Converter

Convert meters to centimeters instantly.

Converters

Feet to Inches Converter

Convert feet to inches instantly.

Converters

Inches to Feet Converter

Convert inches to feet instantly.

Converters

Yards to Meters Converter

Convert yards to meters instantly.

Converters

Liters to Gallons Converter

Convert liters to US gallons instantly.

Converters

Gallons to Liters Converter

Convert US gallons to liters instantly.

Converters

Ounces to Grams Converter

Convert ounces to grams instantly.

Converters

Grams to Ounces Converter

Convert grams to ounces instantly.

Converters

Cups to ML Converter

Convert US cups to milliliters instantly.

Converters

Teaspoons to Tablespoons Converter

Convert teaspoons to tablespoons instantly.

Converters

MPH to KPH Converter

Convert miles per hour to kilometers per hour.

Converters

KPH to MPH Converter

Convert kilometers per hour to miles per hour.

Converters

Square Feet to Square Meters Converter

Convert square feet to square meters instantly.

Converters

Bytes to KB Converter

Convert bytes while clearly separating decimal kilobytes (kB, 1,000 bytes) from binary kibibytes (KiB, 1,024 bytes).

Converters

KB to MB Converter

Convert kilobytes to megabytes using a 1024-based conversion.

Converters

MB to GB Converter

Convert megabytes to gigabytes using a 1024-based conversion.

Converters

Binary Converter

Convert between binary and decimal numbers instantly.

Converters

Hex Converter

Convert between hexadecimal and decimal numbers instantly.

Converters

Celsius to Fahrenheit Converter

Convert Celsius to Fahrenheit instantly.

Converters

Celsius to Kelvin Converter

Convert Celsius to Kelvin instantly.

Converters

Kelvin to Celsius Converter

Convert Kelvin to Celsius instantly.

Converters

Inches to MM Converter

Convert inches to millimeters instantly.

Converters

CM to Feet Converter

Convert centimeters to feet instantly.

Converters

Feet to CM Converter

Convert feet to centimeters instantly.

Converters

Meters to Yards Converter

Convert meters to yards instantly.

Converters

Yards to Feet Converter

Convert yards to feet instantly.

Converters

Miles to Feet Converter

Convert miles to feet instantly.

Converters

Meters to Miles Converter

Convert meters and statute miles instantly in either direction with the exact international-mile relationship, common distances, copy, and a reference table.

Converters

Grams to KG Converter

Convert grams to kilograms instantly.

Converters

KG to Grams Converter

Convert kilograms to grams instantly.

Converters

Ounces to Pounds Converter

Convert ounces to pounds instantly.

Converters

Pounds to Ounces Converter

Convert pounds to ounces instantly.

Converters

ML to Ounces Converter

Convert milliliters to US fluid ounces instantly.

Converters

Ounces to ML Converter

Convert US fluid ounces to milliliters instantly.

Converters

Tablespoons to Cups Converter

Convert tablespoons to US cups instantly.

Converters

Cups to Tablespoons Converter

Convert US cups to tablespoons instantly.

Converters

Quarts to Gallons Converter

Convert US quarts to gallons instantly.

Converters

Gallons to Quarts Converter

Convert US gallons to quarts instantly.

Converters

Acres to Square Feet Converter

Convert acres to square feet instantly.

Converters

Square Feet to Acres Converter

Convert square feet to acres instantly.

Converters

Hectares to Acres Converter

Convert hectares to acres instantly.

Converters

Acres to Hectares Converter

Convert acres to hectares instantly.

Converters

Cups to Ounces Converter

Convert US cups to fluid ounces instantly.

Converters

Ounces to Cups Converter

Convert US fluid ounces to cups instantly.

Converters

Pounds to Grams Converter

Convert pounds to grams instantly.

Converters

Grams to Pounds Converter

Convert grams to pounds instantly.

Converters

CM to Meters Converter

Convert centimeters to meters instantly.

Converters

Meters to MM Converter

Convert meters to millimeters instantly.

Converters

MM to CM Converter

Convert millimeters to centimeters instantly.

Converters

CM to MM Converter

Convert centimeters to millimeters instantly.

Converters

KM to Meters Converter

Convert kilometers to meters instantly.

Converters

Meters to KM Converter

Convert meters to kilometers instantly.

Converters

Yards to Inches Converter

Convert yards to inches instantly.

Converters

Inches to Yards Converter

Convert inches and yards instantly in either direction using the exact 36-inches-per-yard relationship, common values, copy, and a reference table.

Converters

Miles to Yards Converter

Convert miles to yards instantly.

Converters

Tons to Pounds Converter

Convert US short tons, Imperial long tons, or metric tonnes to pounds instantly with explicit ton conventions and common reference values.

Converters

Stone to Pounds Converter

Convert stone to pounds instantly.

Converters

Liters to ML Converter

Convert liters to milliliters instantly.

Converters

ML to Liters Converter

Convert milliliters to liters instantly.

Converters

Cups to Pints Converter

Convert US cups to US pints.

Converters

Pints to Cups Converter

Convert US pints to US cups.

Converters

Pints to Quarts Converter

Convert pints and quarts instantly within US customary or Imperial volume conventions, with the exact 2:1 within-system relationship.

Converters

Tablespoons to Teaspoons Converter

Convert tablespoons to teaspoons.

Converters

Teaspoons to ML Converter

Convert US teaspoons to milliliters.

Converters

Square Meters to Square Feet Converter

Convert square meters to square feet.

Converters

Square Feet to Square Yards Converter

Convert square feet to square yards.

Converters

Currency Converter

Convert between major world currencies with daily reference-rate data, clear rate-date/fetch-status context, inverse rates, popular pairs, local caching, and comparison values.

Converters

Roman Numeral Converter

Convert Arabic numbers and standard Roman numerals in both directions, validate canonical notation, inspect symbol/decomposition guidance, and convert calendar dates into Roman numeral components.

Converters

Number to Words Converter

Convert numbers into written English words instantly.

Converters

Unit Converter

Convert length, weight, temperature, area, volume, speed, time, data, pressure, energy, and other common measurements with two-way input, swap, and all-unit comparison.

Converters

Height Converter

Convert height between feet and inches, centimeters, and meters.

Converters

Shoe Size Converter

Estimate adult shoe size equivalents across US, UK, EU, and centimeters.

Converters

Metric Converter

Convert common measurements between metric and US/imperial units.

Converters

Base Converter

Convert whole numbers between bases 2 through 36.

Converters

Degrees to Radians Converter

Convert degrees to radians instantly.

Converters

Radians to Degrees Converter

Convert radians to degrees instantly.

Converters

Inches to Meters Converter

Convert inches to meters instantly with exact length relationships.

Converters

Meters to Inches Converter

Convert meters to inches instantly.

Converters

Feet to Yards Converter

Convert feet to yards and yards to feet.

Converters

Feet to Miles Converter

Convert feet to miles and miles to feet.

Converters

Miles to Meters Converter

Convert miles to meters and meters to miles.

Converters

Fahrenheit to Kelvin Converter

Convert Fahrenheit to Kelvin and Kelvin to Fahrenheit.

Converters

Kelvin to Fahrenheit Converter

Convert Kelvin to Fahrenheit and Fahrenheit to Kelvin.

Converters

Liters to Quarts Converter

Convert liters to US liquid quarts and back.

Converters

Quarts to Liters Converter

Convert US liquid quarts to liters and back.

Converters

Liters to Pints Converter

Convert liters to US liquid pints and back.

Converters

Pints to Liters Converter

Convert US liquid pints to liters and back.

Converters

PSI to Bar Converter

Convert pounds per square inch to bar and bar to PSI.

Converters

Bar to PSI Converter

Convert bar to pounds per square inch and back.

Converters

kW to HP Converter

Convert kilowatts to mechanical horsepower and horsepower to kilowatts.

Converters

HP to kW Converter

Convert mechanical horsepower to kilowatts and back.

Converters

Nm to ft-lb Converter

Convert newton-meters to pound-force feet and back.

Converters

ft-lb to Nm Converter

Convert pound-force feet to newton-meters and back.

Converters

Square Miles to Square Kilometers Converter

Convert square miles to square kilometers and back.

Converters

Square Kilometers to Square Miles Converter

Convert square kilometers to square miles and back.

Converters

Joules to kWh Converter

Convert joules to kilowatt-hours and kilowatt-hours to joules.

Converters

kWh to Joules Converter

Convert kilowatt-hours to joules and joules to kilowatt-hours.

Converters

Length Converter

Convert length with a two-way editor, common metric/customary pairs, all-unit comparison, quick swap, copy, and clear exact-unit labels.

Converters

Area Converter

Convert area between metric and US/imperial units.

Converters

Volume Converter

Convert volume between metric and US customary units.

Converters

Weight Converter

Convert mass/weight units with two-way entry, common kg/lb and g/oz shortcuts, an all-unit comparison table, and explicit force-vs-mass wording.

Converters

Temperature Converter

Convert Celsius, Fahrenheit, Kelvin, and Rankine with two-way entry, common scale shortcuts, absolute-zero validation, and an all-scale comparison table.

Converters

Speed Converter

Convert speed among m/s, km/h, mph, ft/s, and knots.

Converters

Pressure Converter

Convert pressure among Pa, kPa, MPa, bar, psi, atm, and torr.

Converters

Energy Converter

Convert energy among joules, calories, watt-hours, BTU, and electronvolts.

Converters

Power Converter

Convert power among watts, kilowatts, megawatts, horsepower, and BTU/h.

Converters

Data Storage Converter

Convert bits, bytes, decimal kB/MB/GB/TB, and binary KiB/MiB/GiB/TiB with two-way entry, comparison tables, and explicit decimal-vs-binary definitions.

Converters

Force Unit Converter

Convert force between newtons, pound-force, kilogram-force, kips, and related units.

Converters

Frequency Unit Converter

Convert frequency between hertz, kilohertz, megahertz, gigahertz, RPM, and revolutions per second.

Converters

Flow Rate Unit Converter

Convert volumetric flow rate between metric and US customary engineering units.

Converters

Dynamic Viscosity Converter

Convert dynamic viscosity between Pa·s, mPa·s, centipoise, and poise.

Converters

Acceleration Unit Converter

Convert acceleration between m/s², ft/s², standard gravity, Gal, and related units.

Converters

SI Prefix Converter

Convert values between SI metric prefixes from quecto to quetta.

Converters

Engineering Notation Converter

Convert decimal values to engineering notation and matching SI-prefix form.

Converters

Historical Exchange Rate Calculator

Look up a historical reference exchange rate for a currency pair and date.

Converters

Currency Cross Rate Calculator

Calculate a cross exchange rate from two rates that share the same base currency.

Converters

Roman Numeral Date Converter

Convert a calendar date into Roman numeral components.

Converters

Angle Converter

Convert angles between degrees, radians, gradians, turns, arcminutes, and arcseconds.

Converters

Time Unit Converter

Convert durations between nanoseconds, milliseconds, seconds, minutes, hours, days, weeks, and fixed 365-day years.

Converters

Density Converter

Convert density between kg/m³, g/L, g/cm³, kg/L, lb/ft³, and related units.

Converters

Torque Unit Converter

Convert torque between N·m, lbf·ft, lbf·in, kgf·m, and related engineering units.

Converters

Measurement Conversion Table Generator

Generate a custom range-based measurement conversion table and export it as CSV.

Converters

Custom Unit Ratio Converter

Create a converter from your own known unit relationship, then calculate values and a reusable table.

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