Length Conversions
Convert length and distance units — meters, feet, inches, miles, and more. Free calculators with conversion tables and formulas for construction, travel, and engineering.
10 units · 8 calculators
Length measures how far one point is from another. Different countries and industries use different units: metric units like meters and kilometers dominate science and most of the world, while feet, inches, and miles remain common in the United States and in construction trades.
Converting length units requires a fixed multiplier — unlike temperature, there is no offset. One foot always equals 0.3048 meters. Our calculators apply standard international factors so you get consistent results whether you are reading a blueprint, planning a road trip, or comparing product dimensions online.
When you shop internationally, product dimensions are often listed in centimeters while your tape measure shows inches. A single conversion error on a sofa depth or TV width can mean a return shipment. Use the conversion table below for common inch/cm and foot/meter pairs, then open a dedicated calculator for the exact pair you need.
Quick length calculator
Length Calculator
Formulas & rules
- inches × 2.54 = centimeters
- feet × 0.3048 = meters
- miles × 1.609344 = kilometers
- yards × 0.9144 = meters
Popular length conversions
Real-world example
A furniture listing shows shelf depth in centimeters but your room is measured in inches. Converting 45 cm to inches (≈ 17.7 in) tells you immediately whether the shelf fits without guessing or rounding errors.
Common mistakes
- Confusing nautical miles (1,852 m) with statute miles (1,609 m) when reading marine or aviation charts.
- Rounding inches to centimeters too early in multi-step layout math — convert once at the end when possible.
- Mixing US survey feet with international feet on large-scale mapping (rare in consumer use, but it matters in surveying).
All length conversions
Length units explained
- Millimeters (mm)
- Also: millimeters
- Centimeters (cm)
- Also: centimeters
- Meters (m) · base unit
- Also: meters
- Kilometers (km)
- Also: kilometers
- Inches (in)
- Also: inches, "
- Feet (ft)
- Also: feet, '
- Yards (yd)
- Also: yards
- Miles (mi)
- Also: miles
- Nautical Miles (nmi)
- Also: nautical miles
- Light Years (ly)
- Also: light years
Frequently asked questions
- What is the most common length conversion?
- Inches to centimeters and feet to meters are among the most searched length conversions, especially for shopping, DIY projects, and travel between metric and US customary systems.
- How many feet are in a meter?
- One meter equals approximately 3.28084 feet. To convert meters to feet, multiply by 3.28084.