Conversion Calculators
Convert between units in a click with free conversion calculators for length, weight, temperature, volume, area, speed, and digital data. Accurate conversion factors make switching between metric and imperial fast and reliable.
Browse all 104 conversion calculators below.
Popular in this category
Unit Converter
Convert length, weight, temperature, area, volume, time, speed, pressure, energy, and power instantly.
Calculate nowTemperature Converter
Convert Celsius, Fahrenheit, and Kelvin instantly with exact formulas and a live conversion table.
Calculate nowAcre to Square Mile Converter
Convert acres to square miles and back using the exact 640:1 land-area ratio.
Calculate nowDecimeter to Meter Converter
Convert decimeters (dm) to meters (m) instantly. 1 dm = 0.1 m — divide by 10 for exact metric length.
Calculate nowFeet and Inches Calculator
Convert, add, and subtract feet and inches — including fractions — and see total inches and decimal feet.
Calculate nowAll conversion calculators (104)
Unit ConverterConvert length, weight, temperature, area, volume, time, speed, pressure, energy, and power instantly.Length ConverterConvert meters, feet, miles, and more.Weight / Mass ConverterConvert kilograms, pounds, ounces, and tons.Temperature ConverterConvert Celsius, Fahrenheit, and Kelvin instantly with exact formulas and a live conversion table.Area ConverterConvert square meters, acres, and more.Volume ConverterConvert liters, gallons, cups, and pints.Speed ConverterConvert mph, km/h, knots, and m/s.Time ConverterConvert seconds, minutes, hours, and days.Data Storage ConverterConvert bytes, KB, MB, GB, and TB.Energy ConverterConvert joules, calories, and kilowatt-hours.Pressure ConverterConvert pascals, bar, psi, and atmospheres.Acre to Square Mile ConverterConvert acres to square miles and back using the exact 640:1 land-area ratio.Are to Cent ConverterConvert ares to cents — the South Asian land unit equal to 1/100 acre.Are to Hectare ConverterConvert ares to hectares. 100 ares = 1 hectare (metric land units).Decimeter to Meter ConverterConvert decimeters (dm) to meters (m) instantly. 1 dm = 0.1 m — divide by 10 for exact metric length.Feet and Inches CalculatorConvert, add, and subtract feet and inches — including fractions — and see total inches and decimal feet.Feet to Inches CalculatorConvert feet to inches and inches to feet. 1 ft = 12 in exactly.Inches CalculatorAdd or subtract inch values with automatic fraction and metric output.Inches to Fraction CalculatorConvert decimal inches to the nearest fractional inch (1/2 to 1/128).Light Year ConverterConvert light-years to km, miles, AU, parsecs and more (IAU standard).Mesh to Micron ConverterConvert mesh number to micron opening size (ASTM E11 standard).Pixel to Inch ConverterConvert pixels to inches for any DPI — web (96), print (300), and more.Yard to Acre ConverterConvert square yards to acres. 1 acre = 4,840 square yards exactly.Cubic Feet CalculatorCalculate cubic feet from length × width × height in any unit.Cubic Meter CalculatorCalculate cubic metres (CBM) from dimensions — essential for freight.Cubic Yard to Ton ConverterConvert cubic yards to short tons for concrete, gravel, sand, and soil.Dekagram to Gram ConverterConvert dekagrams to grams. 1 dag = 10 g — commonly used in Central Europe.Drops to mL ConverterConvert drops to millilitres (USP, metric, UK standards) and back.Ounce to Cup ConverterConvert US fluid ounces to cups. 1 US cup = 8 fl oz exactly.Gallon CalculatorConvert between US/UK gallons, litres, pints, quarts, fl oz, and cubic units.Gallon to Pound ConverterConvert gallons to pounds for water, fuel, oil, honey, and more liquids.Gram to Ounce ConverterConvert grams to ounces (avoirdupois, troy) and back with full reference table.Kilogram to Gallon ConverterConvert kilograms to US gallons for water, fuel, oil, and other liquids.Liter to Centiliter ConverterConvert litres to centilitres and back. 1 L = exactly 100 cL.Microgram to Milligram ConverterConvert micrograms to milligrams. 1 mg = 1,000 µg — critical for pharmaceutical dosing.mg to mL CalculatorConvert milligrams to millilitres using concentration — essential for medical dosing.mL to Cups ConverterConvert millilitres to US, metric, UK, and Japanese cups — for international recipes.Pint to Pound ConverterConvert US pints to pounds for water, milk, beer, and other liquids.Pounds and Ounces CalculatorAdd, subtract, and convert between pounds and ounces with metric output.Quart to Pound ConverterConvert US quarts to pounds for water, milk, fuel, and other liquids.Force ConverterConvert between Newton, kgf, lbf, dyne, kip, poundal, and all major force units.Inch Pound to Newton MeterConvert inch-pounds to Newton-metres torque. 1 in·lbf = 0.112985 N·m.Inch Pound to Foot PoundConvert inch-pounds to foot-pounds torque. 1 ft·lbf = exactly 12 in·lbf.Pound to Newton ConverterConvert pound-force to Newtons and back. 1 lbf = 4.44822 N (NIST exact).Newton Meter CalculatorConvert Newton-metres to ft·lbf, in·lbf, kgf·m, and all torque units.Newton Meter to Foot PoundConvert Newton-metres to foot-pounds. 1 N·m = 0.737562 ft·lbf.Newton Meter to Inch PoundConvert Newton-metres to inch-pounds torque. 1 N·m = 8.85075 in·lbf.PSI to GPM CalculatorCalculate flow rate (GPM) from pressure (PSI) using orifice or Cv coefficient method.Torque to Horsepower CalculatorCalculate horsepower and kW from torque (ft·lbf or N·m) and RPM.Torr to Atmosphere ConverterConvert Torr to atm, Pa, bar, PSI, and mmHg. 1 atm = 760 Torr exactly.Coordinate ConverterConvert GPS coordinates between Decimal Degrees (DD) and DMS format.Degrees Minutes Seconds CalculatorAdd and subtract angles in Degrees Minutes Seconds (DMS) format for navigation.Latitude Longitude to UTM ConverterConvert lat/lon (WGS84) to UTM zone, easting, and northing — for GIS and surveying.Scale CalculatorConvert between map distance and real distance — or find the scale ratio.Billion to Trillion ConverterConvert between million, billion, trillion, quadrillion, and more large numbers.Cents to Euro ConverterConvert Euro cents to Euros and back. 1 Euro = exactly 100 cents.Crore to Lakh ConverterConvert crore to lakh and back. 1 crore = 100 lakh in the Indian numbering system.Crore to Million ConverterConvert crore to million. 1 crore = 10 million — South Asian to international finance.Million to Billion ConverterConvert million to billion using short scale. 1 billion = 1,000 million.Million to Lakh ConverterConvert million to lakh and back. 1 million = 10 lakh.Million to Thousand ConverterConvert million to thousand. 1 million = 1,000 thousand.Number to Billion ConverterConvert any number to billions, millions, and trillions.Number to Million ConverterConvert any number to millions instantly.Binary ConverterConvert between decimal, binary, octal, and hexadecimal number systems.Binary to Hex ConverterConvert binary numbers to hexadecimal and back for programming and electronics.Binary to Octal ConverterConvert binary numbers to octal and back. Group 3 binary digits per octal digit.Decimal to Hex ConverterConvert decimal numbers to hexadecimal and back — for web colors and programming.Decimal to Octal ConverterConvert decimal numbers to octal (base 8) and back — used in Unix permissions.Gematria CalculatorCalculate English gematria value using Standard, Reverse, and Pythagorean ciphers.Greek Gematria CalculatorCalculate Greek gematria (isopsephy) value of Greek letters and words.Roman Numeral ConverterConvert Arabic numbers to Roman numerals and back (1–3999).Byte ConverterConvert between bytes, KB, MB, GB, TB using SI (1000) or IEC (1024) standards.Color ConverterConvert colors between HEX, RGB, and HSL formats with live color preview.HEX to RGB ConverterConvert HEX color codes to RGB values and back with live color preview.Kilobyte to Megabyte ConverterConvert kilobytes to megabytes with SI (1,000) or IEC (1,024) standards.Internet Speed CalculatorCalculate download time for any file size and convert Mbps, MB/s, Kbps, Gbps.Mbps to Gbps ConverterConvert Mbps to Gbps and back. 1 Gbps = 1,000 Mbps.MB to GB ConverterConvert megabytes to gigabytes with SI (1,000) or IEC (1,024) standards.RGB to HEX ConverterConvert RGB color values to HEX codes and back with live color preview.Unicode Text ConverterConvert text to Unicode styles: bold, italic, monospace, small caps, and upside down.Unix Time ConverterConvert Unix timestamps to readable dates and back — in UTC, ISO 8601, and local time.Military Time ConverterConvert between 12-hour (AM/PM) and 24-hour military time formats.Minutes to Hours ConverterConvert minutes to hours (decimal and hr:min) and back — for timesheets and scheduling.Time Unit ConverterConvert between nanoseconds, milliseconds, seconds, minutes, hours, days, years, and centuries.Time Zone ConverterConvert times between any two time zones across all UTC offsets (UTC-12 to UTC+12).Years to Decades ConverterConvert years to decades, centuries, millennia — and all time units from seconds to millennia.Zulu Time ConverterConvert between Zulu time (UTC) and local time for any UTC offset — for aviation and military.Angle ConverterConvert between degrees, radians, gradians, arcminutes, arcseconds, turns, and more.CGS Unit ConverterConvert CGS units (dyne, erg, barye, gram) to SI — for physics and engineering.Universal Unit ConverterConvert units across length, mass, volume, speed, power, and frequency — all in one.CPS CalculatorCalculate clicks per second from total clicks and time, or take a live 5-second CPS test.dBm to Watt ConverterConvert dBm to watts and milliwatts — the power unit standard for RF and wireless.Density ConverterConvert between kg/m³, g/cm³, lb/ft³, lb/in³, lb/gal, slug/ft³, and other density units.Dimensional Analysis CalculatorPerform dimensional analysis for speed conversions showing the conversion factor chain.MPG to L/100km ConverterConvert US/UK miles per gallon to L/100km and back — for fuel efficiency comparison.Grams to Calories ConverterConvert grams of fat, protein, and carbs to calories (kcal) using Atwater factors.Hardness ConverterConvert between Vickers, Brinell, Rockwell B, and Rockwell C hardness scales (ASTM E140).Joule to Volt ConverterConvert between Joules, Volts, and Coulombs using E = Q × V — the electrical energy equation.Knot to km/h ConverterConvert knots to km/h and back. 1 knot = 1.852 km/h — for aviation and maritime navigation.Knot to mph ConverterConvert knots to miles per hour and back. 1 knot = 1.15078 mph.Meter per Second to km/h ConverterConvert m/s to km/h and back. 1 m/s = 3.6 km/h exactly — SI to everyday speed unit.Natural Gas ConverterConvert natural gas between m³, ft³, therms, BTU, MMBtu, kWh, and MCF.Newton Meter to Joule ConverterConvert Newton-metres to Joules. 1 N·m = 1 J exactly — with kJ, cal, and kWh conversions.Paper Size ConverterLook up and convert A4, A3, Letter, Legal paper sizes between mm, cm, inches, pt, and pixels.
Frequently asked questions
A:Yes. Every calculator on CalcWisee is free, with no account or payment required.
A:All calculations run locally in your browser. We do not store or transmit the values you enter.
A:They use transparent, verified formulas based on recognised standards. Results are for educational purposes only.
A:Yes. This category is built to grow — new tools are activated regularly.
Reviewed for accuracy · Last updated October 7, 2026
Every conversion calculators tool uses a documented, industry-standard formula reviewed by our editorial team.