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Converters

Unit Converter Workbench

Convert length, mass, temperature, volume, speed, binary-labeled data storage, and fixed-duration time values, compare every unit in a category, and keep optional local history. Essential for engineers, students, and professionals performing quick dimensional analysis without looking up conversion factors.

Conversion and calculation

Press Convert
ALL COMPARATIVE RESULTS

In brief

A transparent factor-based converter covers documented units and affine temperatures; data labels use 1024-based factors and gallon/cup/fluid-ounce factors are US customary.

What this tool supports

  • Length: m, km, cm, mm, mile, yard, foot, inch; mass: kg, g, mg, pound, ounce, stone; temperature: Celsius, Fahrenheit, Kelvin.
  • Volume: litre, millilitre, US gallon, US cup, US fluid ounce; speed: km/h, mph, m/s, knot; time: second, minute, hour, day, fixed seven-day week.
  • Data storage labels B, KB, MB, GB, and TB use powers of 1024 even though the UI does not label them KiB/MiB/GiB/TiB.
  • Converts on demand, swaps units, shows all peer-unit results to six localized decimal places, copies one/all results, and stores up to seven history entries in localStorage.

How to use Unit Converter Workbench

Follow this implementation-specific workflow for Seven-Category Unit Conversion Workbench; each step reflects the controls and limits in the current browser workspace.

  1. 1

    Step 1

    Provide the exact source

    Choose the correct category; identical symbols can mean different quantities and cannot be converted across categories.

  2. 2

    Step 2

    Choose the operation

    Enter a finite decimal value and select exact source and target units, noting US volume and 1024-based data conventions.

  3. 3

    Step 3

    Configure the available options

    Press Convert; the implementation normalizes through one base unit or applies the Celsius affine formula.

  4. 4

    Step 4

    Run the local operation

    Review the primary value and all peer results, remembering that display rounds to at most six fractional digits.

  5. 5

    Step 5

    Verify and continue

    Copy the required result with its unit symbol and clear local history if the values are sensitive.

Common mistakes

Reading KB/MB as SI decimal units

Consequence: The code uses 1 KB=1024 B and 1 MB=1,048,576 B while the labels omit the IEC “KiB/MiB” distinction.

Fix: Confirm the receiving system’s convention and relabel results explicitly when binary factors are required.

Using UK imperial gallons or cups

Consequence: The factors are 3.78541 L per gallon, 0.236588 L per cup, and 0.0295735 L per fluid ounce—US customary approximations.

Fix: Use a dedicated imperial-volume conversion when UK gallons or other cup definitions are required.

Treating the six-decimal display as full precision

Consequence: toLocaleString rounds displayed/copy-all values even though the calculation uses JavaScript Number.

Fix: Retain adequate significant figures, state the factor, and use a precision-controlled scientific tool for regulated work.

Best practices

  • Write both the numeric value and unambiguous unit symbol in every copied or stored result.
  • Check a known factor and direction after swapping units, especially for affine temperatures.
  • Do not use rounded UI output as the sole basis for safety-critical, legal-metrology, medical, or financial calculations.

Connected workflows

Convert and document a measurement

Unit Converter WorkbenchPercentage Calculator

Identify the quantity and unit convention, convert with a known factor, verify direction and rounding, then copy an unambiguous value-unit pair.

  1. Identify quantity and convention
  2. Select source and target
  3. Convert through base unit
  4. Check factor and rounding
  5. Copy value with unit

Browser limitations

  • Calculations use binary IEEE-754 JavaScript Number and fixed factors, with no significant-figure, uncertainty, scientific-notation, or arbitrary-precision control.
  • Negative Kelvin is not blocked, NaN/empty input produces no result, and the supported units are a small fixed list without dimensional analysis.
  • Data and volume naming is ambiguous unless you read the documented 1024-based and US-customary factor conventions.

Authoritative resources

The International System of Units (SI), 9th editionPublisher: BIPM · Reviewed: 2026-07-26

Concrete examples

Input
Length: 1 mile → kilometres
Result
The primary conversion is 1 mi = 1.609344 km.

The code converts one mile to 1609.344 metres, then divides by 1000 metres per kilometre.

Frequently asked questions

Are the gallon and fluid-ounce conversions US or Imperial?

They are US customary approximations: 1 gal=3.78541 L and 1 fl oz=0.0295735 L. UK imperial units are not offered.

Does MB mean 1,000,000 or 1,048,576 bytes here?

It means 1,048,576 bytes because every storage step uses 1024, despite the displayed labels KB/MB rather than KiB/MiB.

How does temperature conversion differ from the other categories?

It converts through Celsius with offsets and scale; multiplying by one fixed ratio would be wrong for °C/°F/K.

Can the converter reject physically impossible values?

No. It performs numeric formulas and does not block negative Kelvin or validate a real-world measurement domain.

Where is conversion history stored?

When enabled it is JSON in this browser’s localStorage, capped at seven non-duplicate recent conversions and clearable from the workspace.

Privacy and offline behavior

Values are calculated locally. When history is enabled, up to seven recent conversions are written to this browser’s localStorage; they can be cleared and are not uploaded by the converter.