Unit Converter

How to use

1. Select Category — Choose the measurement type (length, weight, temperature, etc.)
2. Choose Units — Select the source and target units
3. Enter Value — Type a number and see the conversion instantly

What Is a Unit Converter?

A unit converter translates measurements from one unit to another within the same category. Whether you need to convert miles to kilometers, pounds to kilograms, or Fahrenheit to Celsius, this tool handles the math instantly using standard conversion factors.

Supported Categories

Length

Convert between meters, kilometers, centimeters, millimeters, miles, yards, feet, and inches. Common conversions include 1 mile = 1.609 km, 1 foot = 30.48 cm, and 1 inch = 2.54 cm.

Weight/Mass

Convert kilograms, grams, milligrams, pounds, ounces, and metric tons. Key conversions: 1 kg = 2.205 lbs, 1 pound = 453.6 grams, 1 ounce = 28.35 grams.

Temperature

Convert between Celsius, Fahrenheit, and Kelvin. Unlike other units, temperature conversion uses formulas rather than simple multiplication factors. Water freezes at 0°C = 32°F = 273.15K.

Volume

Convert liters, milliliters, gallons, quarts, cups, and fluid ounces. Essential for cooking (especially between US and metric recipes) and scientific measurements.

Area

Square meters, square kilometers, square feet, square yards, acres, and hectares. Useful for real estate, land measurement, and agriculture.

Speed

Meters per second, km/h, mph, and knots. Key conversion: 1 mph ≈ 1.609 km/h.

Data Storage

Bytes, kilobytes, megabytes, gigabytes, and terabytes using binary definitions (1 KB = 1024 bytes). Essential for computing, file management, and network capacity planning.

Metric vs Imperial

Most of the world uses the metric system (SI units), while the United States primarily uses imperial/customary units. This makes unit conversion essential for international communication, travel, cooking with foreign recipes, and scientific work.

Privacy

All conversions run locally in your browser. No data is sent to any server.

Convert number bases with our Hex to Decimal Converter. Calculate percentages with our Percentage Calculator.

Frequently asked questions

How accurate are the conversions?

Conversions use standard conversion factors with up to 6 decimal places. The factors are based on internationally recognized definitions (e.g., 1 mile = 1609.344 meters exactly).

What unit categories are supported?

Length, weight/mass, temperature, volume, area, speed, and data storage. Each category includes common units used in both metric and imperial systems.

How does temperature conversion work?

Temperature uses different formulas (not simple multiplication): °F = °C × 9/5 + 32, K = °C + 273.15. The tool handles these special conversions automatically.

Are data units in binary or decimal?

This tool uses binary (base-2) definitions: 1 KB = 1024 bytes, 1 MB = 1,048,576 bytes, etc. This matches how operating systems typically report file sizes.

Related free tools

• Water Intake Calculator — Daily hydration target based on weight, activity, and climate.
• Ideal Weight Calculator — Estimate ideal body weight via Devine and Hamwi formulas.
• Heart Rate Zone Calculator — Karvonen training zones for cardio workouts.
• Time Card Calculator — Weekly clock-in/out time tracking with pay calculation.
• Time Duration Calculator — Hours and minutes between two times with overnight support.
• Date Adder / Subtractor — Add or subtract days, weeks, months, or years from any date.
• Markup Calculator — Selling price from cost and markup percentage.
• Profit Margin Calculator — Gross profit and profit margin from revenue and cost.
• ROI Calculator — Return on Investment, absolute gain, and annualized rate.
• CAGR Calculator — Compound Annual Growth Rate from beginning and ending values.
• PayPal Fee Calculator — Estimate PayPal transaction fees and the net you receive.
• Stripe Fee Calculator — Estimate Stripe processing fees and your net payout.