Unit Converter

Utilities

Length, weight & temperature

The Unit Converter handles conversions across 10 measurement categories: length, weight, temperature, speed, volume, pressure, area, data storage, time, and energy. Each category includes a comprehensive set of units from everyday measures to scientific scales.

Converting units by hand is tedious and error-prone, especially for less common conversions like nautical miles to kilometers or BTU to kilowatt-hours. This tool does the math instantly as you type, so you get results without having to remember conversion factors.

All conversions happen locally in your browser using precise mathematical formulas. Temperature conversions use the correct Celsius-Fahrenheit-Kelvin-Rankine relationships, not simple multiplication, ensuring scientific accuracy for every result.

How to Use

1. Select a measurement category by clicking one of the category buttons (length, weight, temperature, etc.).
2. The "From" and "To" units update automatically to common defaults for that category.
3. Change the source unit using the dropdown in the "From" section.
4. Change the target unit using the dropdown in the "To" section.
5. Type a number in the input field and the converted result appears instantly.
6. Click the swap button (arrows icon) to reverse the conversion direction.

Features

• 10 measurement categories: length, weight, temperature, speed, volume, pressure, area, data, time, energy
• Real-time conversion as you type
• Swap button to quickly reverse direction
• Smart number formatting with scientific notation for very small values
• Temperature conversions using correct thermodynamic formulas
• Example conversion shown when input is empty
• Over 90 individual units supported

Frequently Asked Questions

How accurate are the conversions?

Conversions use standard conversion factors and are accurate to 8 decimal places. For temperature, the tool uses exact thermodynamic formulas rather than approximations.

What temperature scales are supported?

Celsius, Fahrenheit, Kelvin, and Rankine. All four can be converted between each other using the correct physical relationships.

Can I convert data storage units?

Yes. The data category includes bytes, kilobytes, megabytes, gigabytes, terabytes, petabytes, and their bit-based equivalents, all using binary (1024-based) conversion.

Why does a very small result show in scientific notation?

When the result is smaller than 0.0001, the tool switches to scientific notation (e.g., 1.2345e-7) for readability.