The Professional's Choice for Unit Conversion
Accurate to 15 decimal places. Convert 500+ units in 7 languages. Built for engineers & scientists. Privacy-first, real-time results, professional tool.
Categories
Length
Convert meters, feet, inches, kilometers, miles and more
Weight
Convert kilograms, pounds, ounces, tons and more
Temperature
Convert Celsius, Fahrenheit, Kelvin and more
Area
Convert square meters, acres, hectares and more
Volume
Convert liters, gallons, cups, milliliters and more
Speed
Convert km/h, mph, m/s, knots and more
Popular Converters
Quick access to the most frequently used unit conversions
Guides & Tutorials
Learn how to convert units accurately with our comprehensive guides
Wine & Spirits: ABV, Proof, Volume and Serving Guide
Learn what ABV and proof mean, how US and UK systems differ, common bottle sizes, standard drink rules, pour measures, and labeling basics.
Blood Sugar: mmol/L vs mg/dL — quick guide
Your doctor says 7.0 mmol/L and a friend says 126 mg/dL — here's how to compare, convert, and interpret blood glucose and A1C.
Aviation Units: Altitude, Speed and Weight Explained
Why pilots use feet, knots, nautical miles and pounds. Clear answers on flight levels, Mach, TAS vs IAS, weight & balance, and ICAO unit standards.
Angles Explained: Degrees, Radians, and Gradians Compared
Clear guide to degrees, radians and gradians: history, formulas, when to use each, calculator settings and trig tips. Practical examples and shortcuts included.
Ancient Measurement Systems: Cubits, Chi, Roman Units Explained
Explore how ancient builders measured: Egyptian cubits, Roman feet, Chinese chi, biblical measures and how they map to modern meters.
3D Printing: Millimeter Precision and Real-World Tolerances
Your 3D printer may say 0.1 mm accuracy. Learn what that means for layer height, nozzle width, shrinkage, fits, wall thickness, and post-processing.
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Languages
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