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Unit Converter

Convert between length, weight, temperature, area, volume, speed, data storage, and time units instantly — accurate, free, and entirely client-side.

Free8 CategoriesInstant Results
From
To
0.1

How it works

A compact workflow from input to download.

1

Pick a Category

Choose Length, Weight, Temperature, Area, Volume, Speed, Data Storage, or Time from the tabs.

2

Select Units & Enter a Value

Choose your 'From' and 'To' units, then type a number — the result updates instantly as you type.

3

Swap or Refine

Use the swap button to flip the conversion direction, or change units at any time to compare values.

Frequently asked questions

Is this converter accurate?
Yes. Every category uses standard, internationally recognized conversion factors (e.g. 1 inch = 2.54 cm exactly). Results are rounded for readability but computed at full floating-point precision internally.
Does it support both metric and imperial units?
Yes. Categories like Length, Weight, Area, Volume, and Speed include common metric units (mm, cm, m, km, g, kg, l) alongside imperial/US units (in, ft, mi, oz, lb, gal), so you can convert freely between the two systems.
How is temperature converted differently?
Celsius, Fahrenheit, and Kelvin aren’t proportional to each other, so they can’t be converted with a simple multiplier — they need offset math (e.g. °F = °C × 9/5 + 32). This tool applies the correct formula for each temperature pair instead of a generic scale factor.
What convention is used for data storage units?
This tool uses the common colloquial convention where 1 KB = 1024 bytes (binary), which matches what most everyday operating systems and file managers display, rather than the strict SI decimal definition.
Is my data uploaded anywhere?
No. All conversions run instantly in your browser using JavaScript — nothing is sent to a server.

Metric vs. Imperial: Why We Still Need Both

Most of the world uses the metric system — a base-10 system where units like meters, grams, and liters scale by powers of ten (1 km = 1000 m). The United States, however, still relies heavily on the imperial/US customary system for everyday measurements: feet, pounds, gallons, and Fahrenheit. Because these two systems coexist in global commerce, engineering, cooking, and travel, converting between them accurately is a routine necessity — a single unit mistake (like NASA's famous 1999 Mars Climate Orbiter loss from a metric/imperial mismatch) can have real consequences.

Why Temperature Conversion Needs Offsets, Not Just Multipliers

Converting length or weight is a simple multiplication because both scales share a common zero point — 0 meters is the same “nothing” as 0 feet. Temperature scales don't share that property: 0°C (water freezing) is not the same physical temperature as 0°F or 0 K. Celsius and Kelvin share a scale size but differ by a 273.15 offset, while Fahrenheit uses both a different scale size and a different zero point. That's why converting Celsius to Fahrenheit requires the formula °F = °C × 9/5 + 32, rather than simply multiplying by a fixed ratio.

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