Unit Conversion Calculator
Convert between units of length, weight, volume, temperature, area, speed, pressure, and energy. Instant results with a full conversion table.
About the Unit Conversion Calculator
This converter handles 8 measurement categories with all common units. Temperature conversion uses the standard formulas: °F = °C × 9/5 + 32, K = °C + 273.15. All other categories convert via a base unit — for example, length uses meters as the base, so 1 mile = 1609.344 m and 1 inch = 0.0254 m. For weight and mass specifically, check our dedicated Mass Calculator for an expanded conversion table.
The full conversion table shows every unit in the selected category at once, making it easy to compare across units without multiple calculations. For tire dimensions that require mm-to-inch conversion, visit the Tire Size Calculator. For weight in Newtons and planetary gravity, see the Weight Calculator.
Related Calculators
Explore more free online calculators to help with your calculations
Take this calculation further
Browse the other calculators collection for more tools in this subject.
For a related calculation, use Bra Size Calculator to calculate bra size in US/UK, EU, and FR/BE/ES sizing systems from underbust and bust measurements. Alternatively, use Weight Calculator to convert weight units (kg, N, lbf, kgf) and calculate your weight on other planets and the Moon.
For the underlying method, read Unit Conversion Guide: Metric, Imperial, and the Math That Connects Them.