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Unit converters for fundamental physical quantities — length, mass, area, volume, angle and more. Instantly convert between SI, imperial and other common units. Essential for engineers, students and scientists working across metric and non-metric systems.
Type any length into one field and all nine units refresh instantly. Spans the full working range from millimetres (mm) through centimetres, metres and kilometres to the complete imperial chain: inches, feet, yards, miles and nautical miles. Ideal for construction, navigation and general engineering.
Enter any area value in one unit and the remaining five update simultaneously. Covers everyday land measurement (m², ha, mu, ac), residential real-estate comparison (ft²) and precision engineering (in²). All conversions use exact SI-defined coefficients — no accumulated rounding errors.
Input a volume value in one unit and all seven update simultaneously. Supports SI cubic metres (m³), litres, millilitres, imperial cubic feet (ft³), US gallon, oil barrel (bbl) and board foot — the full range for civil engineering, petroleum, HVAC and carpentry applications.
Enter a mass in any unit and all seven equivalents update live. Covers the metric system (g, kg, tonne), US customary (oz, lb, US short ton) and UK imperial (long ton) — everything needed for logistics, materials science and international trade documentation.
Typical engineering problems solved with Basic Physical Quantities calculators: