Unit Converter — Length, Weight, Volume, Temperature & More

How This Unit Converter Works

This converter uses a base-unit normalization approach. Each unit has a conversion factor to a base unit (e.g., meters for length, kilograms for weight). To convert from Unit A to Unit B:

Temperature uses special formulas (not base-unit normalization) because the scales have different zero points. The calculator automatically selects the correct formula.

Conversion Categories and Units

The converter supports 10 categories with over 70 units total:

Common Conversions Reference

Key Conversion Formulas

Source: NIST (National Institute of Standards and Technology), BIPM (International Bureau of Weights and Measures), and IEC 60027-2 for binary prefixes.

Tips for Accurate Conversions

• Check the decimal vs binary distinction: For data storage, 1 GB (decimal) = 1,000,000,000 bytes, while 1 GiB (binary) = 1,073,741,824 bytes. Hard drive manufacturers use decimal; operating systems often use binary.
• Temperature is not linear: You cannot simply multiply by a factor. The formulas above must be used because °C and °F have different zero points.
• US vs Imperial gallons: 1 US gallon = 3.785 L. 1 Imperial (UK) gallon = 4.546 L. This calculator uses US gallons by default.
• Use the swap button: If you need the reverse conversion, click the ⇄ button instead of re-selecting units.
• Rounding matters: For scientific or engineering work, use more decimal places. The calculator shows up to 6 decimal places.
• Verify with your institution: For academic or professional purposes, always verify conversion factors with authoritative sources (NIST, BIPM).