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Free unit converter for length, weight, temperature, volume, area, speed, time, data, energy & pressure. Instant accurate conversions with 100+ units across 10 comprehensive categories.
Convert between different length units
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Expert Tool: This converter uses internationally recognized conversion standards from NIST (National Institute of Standards and Technology) and SI (International System of Units) to ensure professional-grade accuracy for engineering, scientific, and everyday use.
Choose from 10 conversion categories: Length, Weight, Temperature, Volume, Area, Speed, Time, Data, Energy, or Pressure. Each category has multiple units available.
Enter your value in the "From" field and select the source unit. Then choose your target unit in the "To" field. Results appear instantly as you type.
Get accurate conversions up to 8 decimal places. Use the swap button to reverse conversion, save to history, or view all unit conversions in the reference table.
Educational Resource: Based on international measurement standards and verified conversion factors. All formulas follow ISO (International Organization for Standardization) guidelines for measurement accuracy.
The world uses two main measurement systems: the Metric System (SI units) and the Imperial System (US/UK units). The metric system is based on powers of 10, making conversions easier (1 km = 1000 m, 1 kg = 1000 g). The imperial system uses different ratios (1 mile = 5280 feet, 1 pound = 16 ounces).
Accurate unit conversions are critical in many fields:
Construction, manufacturing, and design require precise measurements
Medication dosages and patient measurements must be exact
Research and experiments need standardized measurements
Recipe conversions between metric and imperial units
Weight (force) vs Mass (amount of matter). Use kg for mass, not weight in physics.
US gallon (3.785 L) ≠ UK gallon (4.546 L). Always specify which system.
°F = (°C × 9/5) + 32, not just multiply by 1.8. The +32 is crucial!
Keep full precision during calculations, round only the final result.
Verified Formulas: All conversion formulas are verified against NIST Special Publication 811 and ISO 80000 standards. These are the same standards used by engineers, scientists, and researchers worldwide.
All unit conversions follow a simple principle: multiply by a conversion factor. A conversion factor is a ratio that equals 1, allowing you to change units without changing the actual quantity.
Example: Convert 5 meters to feet
5 m × 3.28084 ft/m = 16.4042 ft
For very large or very small numbers, scientific notation makes conversions easier. Our calculator handles scientific notation automatically.
Our unit converter uses precise conversion factors and formulas to ensure accuracy up to 8 decimal places. All conversions are based on internationally recognized standards including SI units (International System of Units) and NIST (National Institute of Standards and Technology) guidelines. For scientific and engineering applications, our calculator provides professional-grade accuracy that meets industry requirements.
Our unit converter is designed to be intuitive and accurate. All conversion factors are verified against international standards (NIST, ISO, SI) to ensure reliability for professional, educational, and personal use.
Standards Compliance: This tool follows measurement standards from NIST Special Publication 811, ISO 80000, and the International Bureau of Weights and Measures (BIPM).
Calculate distances between locations
Calculate area of various shapes
Calculate volume of 3D objects
Calculate speed, distance, and time
Calculate Body Mass Index
Calculate percentages easily
Advanced scientific calculations
Convert and calculate fractions