Unit Converter — Length, Weight & More
Convert between length, weight, temperature, speed, and data units. Instant results with all common units. Free online tool.
Convert units — length, weight, temperature, speed, data
A universal unit converter supporting 5 categories with all common units. Convert between meters, miles, feet, kilograms, pounds, Celsius, Fahrenheit, and more. Results update instantly.
Whether you are converting miles to kilometers, Fahrenheit to Celsius, pounds to kilograms, or bytes to gigabytes, this universal converter handles all common unit conversions across five categories: length, weight, temperature, speed, and data storage.
All conversions use precise conversion factors and calculate instantly as you type. No data is sent to any server — everything runs locally in your browser.
How the Unit Converter Works
- Select the measurement category (length, weight, temperature, volume, etc.)
- Choose the source and target units
- Enter a value — the conversion updates instantly
- Switch direction with the swap button to convert the other way
Unit Conversion Tips
The metric system (meters, kilograms, liters) is used by most of the world, while the US primarily uses imperial units (feet, pounds, gallons). Temperature conversions are the trickiest: to go from Celsius to Fahrenheit, multiply by 9/5 and add 32. For cooking, note that a US cup (237 ml) differs from a metric cup (250 ml). This converter handles all these nuances automatically.
When to Use a Unit Converter
Use this converter whenever you encounter unfamiliar units in recipes (cups to grams), travel (miles to kilometers, Fahrenheit to Celsius), science homework (converting between SI and imperial units), fitness tracking (pounds to kilograms), or international commerce (converting measurements between metric and imperial systems). It is also essential for developers working with data storage units (bytes, kilobytes, megabytes, gigabytes) and speed measurements.
Common Use Cases
- •Convert recipe measurements between metric and imperial (cups to grams, Fahrenheit to Celsius) Weight Converter — kg, lbs, Stone & More
- •Convert distances while traveling internationally (miles to kilometers)
- •Calculate data storage sizes for IT planning (GB to TB, MB to GB)
- •Convert speed units for international comparisons (mph to km/h)
- •Convert between Celsius, Fahrenheit, and Kelvin for science and weather
Expert Tips
- ✱For cooking, use weight (grams) rather than volume (cups) for accuracy — a cup of flour can vary from 100g to 150g depending on packing
- ✱Quick mental conversions: 1 mile ≈ 1.6 km, 1 kg ≈ 2.2 lbs, 1 inch = 2.54 cm exactly
- ✱Temperature conversions have an offset (not just a ratio) — the formulas are °F = °C × 1.8 + 32 and °C = (°F - 32) / 1.8
Frequently Asked Questions
- Multiply the Celsius temperature by 9/5 (or 1.8), then add 32. For example, 20°C = (20 x 1.8) + 32 = 68°F. To convert back: subtract 32 from Fahrenheit, then multiply by 5/9. The two scales meet at -40° (-40°C = -40°F).
- One mile equals exactly 1.609344 kilometers. To convert miles to km, multiply by 1.609. To convert km to miles, multiply by 0.6214. A quick mental shortcut: miles x 8 / 5 gives a close approximation to kilometers.
- The metric system (SI) is based on powers of 10 (meters, grams, liters) and is used by most countries worldwide. The imperial system uses feet, pounds, and gallons, primarily in the United States, Liberia, and Myanmar. Science and medicine universally use metric units.
- Cup-to-gram conversion depends on the ingredient because cups measure volume while grams measure weight. One cup of water is 236 grams, but one cup of flour is about 125 grams and one cup of sugar is about 200 grams. For precise baking, always use weight (grams) rather than volume (cups).
- Yes, completely free with no limitations. It supports length, weight, temperature, speed, and data storage conversions. All calculations run in your browser with no data sent to any server.
How do I convert Celsius to Fahrenheit?▾
How many kilometers are in a mile?▾
What is the difference between metric and imperial?▾
How do I convert cups to grams?▾
Is this unit converter free?▾
Related Tools
Weight Converter — kg, lbs, Stone & More
Convert between kilograms, pounds, stone, ounces, tonnes and 12 weight units. Instant results with reference table. Free online.
Length Converter — Meters, Feet & Miles
Convert between meters, feet, inches, miles, kilometers, and 13 length units. Instant results with full reference table.
BMI Calculator — Free Body Mass Index Tool
Calculate your Body Mass Index based on height and weight. See your BMI category instantly. Free online health calculator.
Percentage Calculator — 4 Calculators in One
Calculate percentages instantly: X% of Y, percentage change, tip calculator and more. Four calculators in one free tool.
Number Base Converter — Binary, Hex & More
Convert between binary, octal, decimal, and hexadecimal number systems instantly. Free online tool for developers and students.
Date Calculator — Add Days & Find Differences
Calculate the difference between two dates or add/subtract days from any date. Shows years, months, and days. Free online tool.
Learn More
A Practical Guide to Unit Conversion: Weight, Length, Temperature, and More
Learn how unit conversion works, why different measurement systems exist, and how to convert between metric, imperial, and other units accurately.
Free Online Calculators for Everyday Math and Finance
Discover free calculators for percentages, discounts, VAT, compound interest, unit conversion, and more. Practical tools for students, professionals, and anyone who needs quick answers.
Unit Converter
Convert between units of length, weight, temperature and more — always one click away from your browser toolbar.
Install Free Extension