Conversion
Physics & Engineering Unit Conversion
Popular Unit Conversions
About Conversion Calculators
Convert between measurement units instantly with our comprehensive suite of unit conversion tools. Supporting length, weight, temperature, volume, area, speed, pressure, energy, data storage, and cooking measurements, each converter uses exact conversion factors from NIST and international standards (SI, ISO 80000). Whether you need metric-to-imperial, scientific notation, or cooking unit conversions, our tools deliver precise results with clear formula references.
- ✓Exact conversion factors from NIST and BIPM international standards.
- ✓Bidirectional conversion with real-time results as you type.
- ✓Support for 200+ unit types across 12 measurement categories.
- ✓Reference tables showing common conversion values and formulas.
Physics & Engineering Unit Conversion
Conversion — Frequently Asked Questions
Why do some conversions show many decimal places?
Our converters use exact conversion factors rather than rounded approximations. For example, 1 inch = exactly 2.54 cm (by international agreement), but 1 mile = 1.609344 km exactly. We display full precision so you can round to the appropriate significant figures for your application. In engineering contexts, always match your output precision to your measurement accuracy.
How do I convert between Celsius and Fahrenheit?
The formula is: °F = (°C × 9/5) + 32. To convert back: °C = (°F − 32) × 5/9. Key reference points: water freezes at 0°C / 32°F and boils at 100°C / 212°F. Our temperature converter also supports Kelvin, Rankine, and other scientific temperature scales.
What is the difference between mass and weight in unit conversions?
Mass (kilograms, pounds-mass) measures the amount of matter and is constant regardless of location. Weight (newtons, pounds-force) measures gravitational force and varies with gravity. On Earth, 1 kg of mass weighs approximately 9.81 N. Our weight converter handles both mass units (kg, lb, oz, stone) and force units (N, lbf) separately to avoid confusion.
How are cooking measurements different from standard units?
Cooking uses volume-based measurements (cups, tablespoons, teaspoons) that differ between US customary and metric systems. A US cup = 236.59 mL, while a metric cup = 250 mL. Additionally, ingredient density affects weight-to-volume conversions: 1 cup of flour ≈ 125g, but 1 cup of sugar ≈ 200g. Our cooking converter handles both volume and weight conversions with ingredient-specific density factors.
Can I convert data storage units like GB to TB?
Yes. Our data storage converter supports bits, bytes, KB, MB, GB, TB, PB, and EB in both decimal (SI: 1 GB = 10⁹ bytes) and binary (IEC: 1 GiB = 2³⁰ bytes) standards. Note that operating systems often report storage in binary units (GiB) while manufacturers use decimal units (GB), which is why a "500 GB" drive shows approximately 465 GiB in Windows.