Conversion Tools
Convert measurements, numbers, time, and scientific or engineering quantities locally. Explicit unit definitions, useful precision and no uploads.
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Free. No sign-up required.Conversion Workspace
All published converters in one workspace, with search, grouped navigation and explicit compatible handoffs.
Open workspaceUnit Converter
Convert 53 units across length, mass, temperature, area, volume and speed.
Open toolNumber Base Converter
Convert signed whole numbers between binary, octal, decimal, hexadecimal and bases 2–36.
Open toolRoman Numeral Converter
Convert decimal integers to Roman numerals and validate Roman numerals back to numbers.
Open toolTime Zone Converter
Convert a local date and time between IANA time zones.
Open toolDuration Converter
Convert fixed durations between nanoseconds, seconds, minutes, hours, days and weeks.
Open toolFraction / Decimal / Percentage Converter
Convert fractions, mixed numbers, recurring decimals and percentages with exact fraction arithmetic.
Open toolScientific Notation Converter
Convert ordinary decimals and scientific notation into exact decimal, normalized scientific and engineering forms.
Open toolNumber to Words
Spell signed decimal numbers in English using US or British wording.
Open toolWords to Number
Turn conventional English number words into exact decimal numbers.
Open toolDecimal Hours Converter
Convert decimal hours and signed HH:MM:SS durations for time sheets and elapsed time.
Open toolFeet & Inches Converter
Convert mixed feet and fractional inches to metric lengths, or metric values to feet and inches.
Open toolPressure Converter
Convert absolute or gauge pressure with an explicit absolute reference.
Open toolEnergy Converter
Convert energy and work between joules, watt-hours, clearly labeled calorie definitions, International Table BTU, electronvolts and foot-pounds force.
Open toolPower Converter
Convert watts, kilowatts, BTU per hour and distinct mechanical, metric and electrical horsepower definitions.
Open toolAngle Converter
Convert signed angles between degrees, radians, gradians, turns, arcminutes, arcseconds and DMS.
Open toolFrequency / Period Converter
Convert frequency to period or scale Hz, kHz, MHz, GHz, cycle rates and time periods.
Open toolFuel Consumption Converter
Convert L/100 km, L/km, km/L and US or Imperial mpg.
Open toolForce Converter
Convert newtons, dynes, kilogram-force, pound-force, ounce-force and kips using explicit standard-gravity definitions.
Open toolTorque Converter
Convert moments of force between N·m, lbf·ft, lbf·in, kgf·m and related torque units.
Open toolDensity Converter
Convert mass density between metric, US liquid and Imperial units.
Open toolAcceleration Converter
Convert acceleration between m/s², ft/s², inches/s², Gal and standard-gravity units.
Open toolVolume Flow Converter
Convert actual volumetric flow between metric rates, cubic feet and US or Imperial gallons per minute.
Open toolMass Flow Converter
Convert mass flow between kg/s, kg/h, g/min, lb/h and metric, US or Imperial tons per hour.
Open toolTemperature Difference Converter
Convert temperature changes between Celsius, Fahrenheit, Kelvin and Rankine intervals.
Open toolSI Prefix Converter
Scale quantities across all 24 SI prefixes, from quetta to quecto, plus unprefixed units.
Open toolSurface Density Converter
Convert mass per area between gsm, kg/m², ounces per square yard and other explicit units.
Open toolViscosity Converter
Convert dynamic or kinematic viscosity units.
Open toolData Rate Converter
Convert 26 bit and byte rate units with explicit decimal and binary prefixes.
Open toolTransfer Time Converter
Estimate transfer time from file size, rate and optional bandwidth overhead.
Open toolTypography Unit Converter
Convert CSS typography units with explicit em, rem and percentage references.
Open toolDPI / Pixels / Print Size Converter
Calculate print size, image pixels or PPI with explicit dimensions and density.
Open toolDecimal / DMS Coordinate Converter
Convert latitude/longitude between decimal degrees and DMS with sign validation.
Open toolCSS Time Converter
Convert s, ms and frame counts with explicit FPS and CSS timing context.
Open toolCooking Volume Converter
Convert named cups, spoons and liquid measures with exact fractions and recipe scaling.
Open toolMass / Volume with Density
Convert mass and volume using a required, user-supplied material density.
Open toolPace / Speed Converter
Convert speed and pace, including min/km and min/mile clock notation.
Open toolCurrency Converter · Manual Rates
Convert currencies using your own dated rate, with explicit direction and rounding.
Open toolTimestamp Converter
Convert Unix seconds, milliseconds and ISO dates, with UTC and browser local time.
Open toolColor Converter
Convert HEX, RGB and HSL with alpha, a color picker and a transparency preview.
Open toolByte Size Converter
Convert bits, bytes, KB/MB/GB and KiB/MiB/GiB with exact results.
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