Convert measurements between metric, Imperial, US customary, and scientific units instantly.
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Convert distances and lengths between common measurement systems.
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1 meter expressed in other length units.
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Values are calculated using the unit definitions described below. Displayed values may be rounded; calculations use the unrounded values internally.
Linear units are converted through a common base unit to help keep calculations consistent.
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A unit converter helps express the same measurement in a different unit. Whether you are checking a distance, converting a recipe, comparing vehicle speed, or working with digital storage, choosing the correct unit definitions helps you interpret the result confidently.
A unit converter applies a mathematical relationship between two units that measure the same kind of quantity. For example, meters and feet measure length, while liters and US gallons measure volume. Some conversions use a fixed factor; temperature and fuel economy require formulas that account for offsets or reciprocal relationships.
Choose a category, enter a number in either value field, and select the source and target units. The result updates as you type. Use the swap button to reverse the units, search inside a unit selector to find a specific measurement, or use the results table to compare the same value across the category.
The metric system uses units such as meters, kilograms, and liters. US customary and Imperial systems use some similar names but do not always define them identically. For example, a US liquid gallon and an Imperial gallon have different volumes. Choose the clearly labeled unit that matches your source measurement.
For many units, a value is multiplied by a fixed factor to reach a common base unit, then converted from that base to the destination unit. Exact defining relationships are used where available, while some scientific or customary definitions use conventional constants. Results are rounded for display only.
Celsius and Fahrenheit scales use different zero points and different-sized degrees, so conversion requires both scaling and an offset. Kelvin and Rankine are absolute temperature scales. Negative Celsius or Fahrenheit readings can be valid, but temperatures below absolute zero are not physically meaningful.
Digital units can use decimal or binary prefixes. A kilobyte (kB) is defined here as 1,000 bytes, while a kibibyte (KiB) is 1,024 bytes. The symbols also matter: b means bit and B means byte. One byte contains eight bits.
Quick answers about unit conversion and result accuracy.
A unit converter changes a measurement from one unit to another within the same quantity, such as meters to feet or Celsius to Fahrenheit.
Select the measurement category, enter the value, and choose the From and To units. The calculator applies the relevant conversion factor or formula and updates the result automatically.
Yes. The calculator is designed to be used free of charge and does not require an account.
Yes. The layout adapts to desktop, tablet, and mobile screens. You can use the category controls, unit selectors, result table, and copy tools on supported mobile browsers.
The calculator uses documented conversion factors and category-specific formulas. Results may be rounded for display, but the rounded text is not reused for the underlying calculations. Floating-point arithmetic can still introduce tiny numerical differences.
The metric system is based on units such as meters, grams, and liters. Imperial and US customary systems use units such as feet, pounds, and gallons, and similarly named units may have different values between the two systems.
The two scales have different zero points and different-sized degrees. Celsius to Fahrenheit uses °F = (°C × 9/5) + 32, while Fahrenheit to Celsius uses °C = (°F − 32) × 5/9.
MB normally denotes a decimal megabyte of 1,000,000 bytes. MiB denotes a binary mebibyte of 1,048,576 bytes. They are not exactly the same size.
The conversion code performs calculations directly in your browser and does not send the entered measurement values to an external calculation service.
Yes. Where the units measure the same quantity, choose the explicitly labeled US customary or Imperial units in the relevant category. For example, US liquid gallons and Imperial gallons are both available in Volume.