Free Online Converters

Convert between physical units, electrical units, number formats, and colors — free, with no signup required. Every converter runs directly in your browser.

Physical Unit Converters

Convert length, area, weight, volume, temperature, speed, pace, pressure, angle, and torque between common units.

Length ConverterArea ConverterWeight ConverterVolume ConverterTemperature ConverterSpeed ConverterPace ConverterPressure ConverterAngle ConverterTorque Converter

Electrical Unit Converters

Convert current, voltage, power, energy, charge, and frequency between standard electrical units.

Current ConverterVoltage ConverterPower ConverterReactive Power ConverterApparent Power ConverterEnergy ConverterReactive Energy ConverterCharge ConverterFrequency Converter

Other Unit Converters

Convert time zones and durations, digital storage sizes, parts-per concentrations, volumetric flow rate, and illuminance.

Time ConverterDigital ConverterParts Per ConverterEach ConverterVolumetric Flow Rate ConverterIlluminance Converter

Number & Text Converters

Convert numbers to written words with Number to Word Converter, or the reverse with Word to Number Converter. Convert between numerals and Roman numerals, or work with binary values.

Number to Word ConverterNumbers to Words ConverterWord to Number ConverterNumber to Roman NumeralsRoman Numerals to NumberBinary CalculatorBinary Translator

Color Tools

Convert colors between formats with Color Converter, pick a color visually with Color Picker, or convert RGB values to hex with RGB to Hex.

Color ConverterColor PickerRGB to Hex

Media & Data Converters

Convert subtitle files between VTT to SRT and SRT to VTT, transform spreadsheet data with CSV to JSON, check exchange rates with Currency Converter, or calculate age with Age Calculator.

VTT to SRTSRT to VTTCSV to JSONCurrency ConverterAge Calculator

How to Use These Converters

1. Pick the right category first. Physical, electrical, and number converters each cover a distinct set of units.
2. Double-check unit abbreviations. Many units share similar names across categories (like different types of power or energy), so confirm you've selected the correct one.
3. Use Currency Converter for live rates. Exchange rates change constantly, so always get a fresh conversion rather than relying on a memorized rate.

Frequently Asked Questions

Are these converters free?

Yes, all converters on this page are free with no signup required.

What's the difference between Power Converter and Reactive Power Converter?

Power Converter handles real (active) power, while Reactive Power Converter handles the reactive component in AC circuits; Apparent Power Converter covers the combination of both.

How accurate is the Currency Converter?

It reflects current exchange rate data at the time of conversion, though real-world rates can shift slightly by the time a transaction actually completes.

Can I convert between Roman numerals and regular numbers?

Yes, use Number to Roman Numerals or Roman Numerals to Number depending on which direction you need.

What is a Parts Per Converter used for?

It converts between concentration units like parts per million, parts per billion, and percentage, commonly used in chemistry and environmental measurements.

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