Unit Converter
Unit converters transform measurements between different systems: metric (SI), imperial (US), and specialized units. Common conversions: length (meters, feet, miles), weight (kg, lbs), temperature (°C, °F, K), volume (liters, gallons), area (sq m, sq ft), speed (km/h, mph), energy (joules, calories). Conversion factors: 1 inch = 2.54 cm exactly, 1 lb = 0.453592 kg, 1 mile = 1.609344 km. Temperature: °F = (°C × 9/5) + 32. Scientific: 1 joule = 0.239 calories. Always use precise conversion factors for accuracy in engineering, science, international commerce.
All-in-one unit converter for length, weight, temperature, volume, area, speed, time, and data. Convert between metric and imperial units instantly with real-time results and a quick reference table.
Length Converter
Common Length Conversions
| From | To | Value |
|---|---|---|
| 1 inch | cm | 2.54 |
| 1 foot | meters | 0.3048 |
| 1 yard | meters | 0.9144 |
| 1 mile | km | 1.60934 |
| 1 km | miles | 0.62137 |
| 1 nautical mile | km | 1.852 |
How to Use
- Enter your value in the input field
- Click the Calculate/Convert button
- Copy the result to your clipboard
Frequently Asked Questions
- How do I convert between metric and imperial units?
- Select the category (length, weight, volume, etc.), choose the source unit from the left dropdown and the target unit from the right dropdown, then type a value. The converter instantly shows the result. You can also click the swap button to reverse the conversion direction.
- What unit categories does this converter support?
- This all-in-one converter supports 8 categories: Length (mm to miles), Weight/Mass (mg to tons), Temperature (°C, °F, K), Volume (mL to gallons), Area (mm² to hectares), Speed (m/s to knots), Time (seconds to years), and Data/Digital (bits to petabytes).
- How do I convert cups to milliliters?
- 1 US cup equals 236.588 mL. Select the Volume category, choose "Cups (US)" as the source unit and "Milliliters (mL)" as the target unit, then enter the number of cups. Common conversions: ½ cup = 118 mL, 1 cup = 237 mL, 2 cups = 473 mL.
- What is the difference between US and UK gallons?
- A US gallon equals 3.785 liters, while a UK (imperial) gallon equals 4.546 liters. The UK gallon is about 20% larger. This converter supports both so you can convert accurately regardless of which system you need.
- How accurate are the conversions?
- All conversions use precise, internationally recognized conversion factors. For example, 1 inch = exactly 25.4 mm, 1 pound = exactly 0.45359237 kg, and 1 mile = exactly 1.609344 km. Results are displayed with up to 8 significant digits for small values.
- Does the converter work offline?
- Yes. All conversion calculations are performed entirely in your browser using JavaScript — no server calls are needed. Once the page is loaded, you can convert units even without an internet connection.