About Unit Converter
Converts between units across six categories: length, weight, temperature, volume, area, and speed. Most conversions use a multiplication factor relative to a base unit, but temperature gets special handling—the tool routes through Celsius as a hub, applying the correct formula for Fahrenheit, Kelvin, and Rankine conversions. Includes less common units like nautical miles, stones, short tons, and long tons.
- Six categories: length (9 units including nautical miles), weight (8 units including stones and short/long tons), temperature (4 units with formula-based conversion), volume (9 units), area (8 units), speed (5 units)
- Temperature conversions use Celsius as a hub with dedicated formulas for Fahrenheit, Kelvin, and Rankine—not simple multiplication factors
- Factor-based conversion for non-temperature units ensures accuracy across the full range without floating-point drift on common conversions
- Swap button reverses source and target units while keeping the numeric value
Frequently Asked Questions
- Why is Rankine included?
- Rankine is the absolute temperature scale for Fahrenheit, used in some US engineering contexts (thermodynamics, HVAC calculations). It’s the Fahrenheit equivalent of Kelvin.
- Are the weight units mass or force?
- Mass. Kilograms, pounds, ounces, stones—all mass units. If you need force (newtons, pounds-force), this tool doesn’t cover that.