Length Converter
Convert between meters, kilometers, miles, feet and inches.
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Value
Result
Meters:
Kilometers:
Miles:
Feet:
Inches:
About Length Converter
This length converter converts between metric units (meters, kilometers) and imperial units (miles, feet, inches) using exact internationally-defined conversion factors.
It is useful for engineering calculations, construction projects, product specifications, travel planning, and any situation requiring conversion between different measurement systems.
Conversion Factors Reference
| Unit | Symbol | Meters Equivalent | System |
|---|---|---|---|
| Meter | m | 1 (base unit) | Metric (SI) |
| Kilometer | km | 1,000 | Metric (SI) |
| Mile | mi | 1,609.344 | Imperial |
| Foot | ft | 0.3048 (exact) | Imperial |
| Inch | in | 0.0254 (exact) | Imperial |
Common Conversion Formulas
Meters to Feet: feet = meters × 3.28084 Meters to Inches: inches = meters × 39.3701 Kilometers to Miles: miles = km × 0.621371 Feet to Meters: meters = feet × 0.3048 Inches to Meters: meters = inches × 0.0254
Metric System Prefixes
The metric system uses decimal prefixes for scalable units:
| Prefix | Symbol | Factor |
|---|---|---|
| Milli- | mm | 0.001 m |
| Centi- | cm | 0.01 m |
| Deci- | dm | 0.1 m |
| Deka- | dam | 10 m |
| Hecto- | hm | 100 m |
| Kilo- | km | 1,000 m |
Imperial Unit Relationships
- 12 inches = 1 foot - Used for small measurements, screen sizes, lumber
- 3 feet = 1 yard - Used for fabric, medium distances
- 5,280 feet = 1 mile - Used for road distances, running
- 1 nautical mile = 1,852 meters - Used for maritime, aviation (not included in this converter)
Common Use Cases
- Engineering: Convert specifications between metric and imperial drawings
- Construction: Translate measurements for materials sourced from different countries
- Travel: Understand distance signs and maps when traveling abroad
- E-commerce: Convert product dimensions for international customers
- Education: Learn unit conversion for math and science classes
Accuracy Considerations
The conversion factors used are exact definitions established by international agreement:
- Foot and inch are defined as exactly 0.3048 m and 0.0254 m respectively (since 1959)
- Mile is defined as exactly 1,609.344 meters (5,280 × 0.3048)
- Results are displayed to 4 decimal places, sufficient for most practical applications
- For precision engineering, use the full factor without rounding
Frequently Asked Questions
- What are the conversion factors between metric and imperial units?
- The exact conversion factors are: 1 kilometer = 1000 meters, 1 mile = 1609.344 meters, 1 foot = 0.3048 meters (exactly), 1 inch = 0.0254 meters (exactly). These are the internationally agreed-upon definitions used for all scientific and engineering calculations.
- How do I convert meters to feet manually?
- To convert meters to feet, multiply the meter value by 3.28084 (which is 1/0.3048). For example, 2 meters = 2 × 3.28084 = 6.56168 feet. To convert feet to meters, multiply by 0.3048.
- What is the difference between metric and imperial systems?
- The metric system (SI) uses base-10 multiples: millimeter, centimeter, meter, kilometer. The imperial system uses non-decimal ratios: 12 inches = 1 foot, 3 feet = 1 yard, 5280 feet = 1 mile. Metric is used globally in science and most countries; imperial is primarily used in the United States.
- How accurate are the conversion results?
- This converter uses exact conversion factors defined by international standards. Results are displayed to 4 decimal places, which provides precision suitable for most engineering and construction applications. For higher precision needs, multiply the displayed result by the appropriate factor.
- What are common length conversion mistakes?
- Common mistakes include: confusing feet (ft) with inches (in), mixing up meters and millimeters, forgetting that 1 square meter ≠ 1 meter × 1 meter in area calculations, and using approximate factors like 3.28 instead of 3.28084 for precision work. Always verify which unit system your source data uses.
- When should I use metric vs imperial units?
- Use metric units (meters, kilometers) for scientific work, international projects, and most engineering applications. Use imperial units (feet, inches, miles) when working with US-based specifications, construction plans, or legacy systems. Many industries are transitioning to metric, but imperial remains common in US construction and manufacturing.