Length Converter 📏
Free online length converter. Convert meters to feet, cm to inches, km to miles and 25+ length units instantly. m to ft calculator with formulas.
📐 Conversion Formula
Common Length Conversions
Quick Length Conversions
Meters to Feet
× 3.28084
10 m = 32.8 ft
cm to Inches
÷ 2.54
100 cm = 39.4 in
km to Miles
× 0.621371
10 km = 6.2 mi
Miles to km
× 1.60934
5 mi = 8 km
Converter Performance Metrics
How to Use Length Converter
Step 1: Enter Length Value
Type the length value you want to convert in the "From" field. The converter accepts any positive number including decimals. For example, enter 100 for 100 cm or 10 for 10 meters depending on your selected unit.
Step 2: Select Source Unit
Choose the unit of your input length from the "From" dropdown. Options include meters, feet, centimeters, inches and 25+ other length units. Select the unit that matches your ruler or measurement device.
Step 3: Select Target Unit
Pick the unit you want to convert to from the "To" dropdown. The conversion happens automatically in real-time as you change units. The formula used for conversion is displayed below for educational reference.
Step 4: Use Results
View the converted result in the "To" field. Click Copy to copy the result to clipboard, Swap to reverse conversion direction, or Reset to start over. All calculations are instant and accurate for construction and travel.
Understanding Length Measurement
What is Length?
Length is measurement of distance between two points—one-dimensional extent. SI unit: meter (m). Imperial units: inch, foot, yard, mile. Length measurements critical for construction, travel, science, daily life. Basic tool: ruler (inches/cm), tape measure (feet/meters), odometer (miles/km). Understanding conversions essential internationally.
Conversion Formulas: \( 1 \text{ meter} = 3.28084 \text{ feet} \), \( 1 \text{ foot} = 0.3048 \text{ meters} \), \( 1 \text{ cm} = 0.393701 \text{ inches} \), \( 1 \text{ inch} = 2.54 \text{ cm} \), \( 1 \text{ km} = 0.621371 \text{ miles} \), \( 1 \text{ mile} = 1.60934 \text{ km} \). Key relationships: 1 m = 100 cm = 1,000 mm, 1 ft = 12 in, 1 yd = 3 ft = 36 in, 1 mi = 5,280 ft = 1,760 yd, 1 km = 1,000 m.
Common Length Units Explained
Meter (m): SI unit of length. Standard worldwide except USA. Average adult height ~1.7 m. Door height ~2 m. Room length 3-5 m. 1 meter = 100 centimeters = 1,000 millimeters. Defined by speed of light in vacuum. Conversions: 1 m = 3.281 ft = 39.37 in. Essential for construction, science, international measurements.
Foot (ft) & Inch (in): Imperial/US length units. 1 foot = 12 inches = 0.3048 meters. Average adult height ~5-6 feet. Ceiling height ~8 feet. 1 inch = 2.54 cm exactly. Screens measured in inches (TV 55", phone 6"). USA construction uses feet/inches. Understanding conversions essential for international projects, travel, online shopping.
Kilometer (km) & Mile (mi): Large distance units. 1 km = 1,000 m = 0.621 miles. 1 mile = 1.609 km = 5,280 feet. Road signs USA use miles, rest of world km. Marathon = 42.195 km = 26.2 miles. Speed limits, fuel efficiency, GPS distances all use these units. Understanding km/mi critical for international travel, maps, navigation.
Common Use Cases
🏗️ Construction & DIY
Convert measurements for building, renovation, furniture assembly. USA blueprints use feet/inches, international use meters/cm. Lumber sizes, room dimensions, ceiling heights all need conversions. Essential for contractors, architects, DIY projects understanding specifications from different measurement systems.
🚗 Travel & Navigation
Convert distances for international travel. USA uses miles, rest of world uses km. Road signs, GPS navigation, distance calculations. Marathon 42.2 km = 26.2 mi. Understanding km/mi essential for rental cars abroad, trip planning, fuel efficiency comparisons, and reading maps internationally.
📱 Technology & Screens
Convert screen sizes—TVs, phones, monitors measured in inches. International specs may use cm. TV 55" = 140 cm diagonal. Phone 6.5" = 16.5 cm. Understanding inch/cm conversions essential for online shopping, comparing products internationally, and understanding device specifications accurately.
👕 Clothing & Fashion
Convert body measurements for international clothing sizes. Height, inseam, waist in cm or inches depending on country. European sizes use cm, USA uses inches. Online shopping requires understanding measurements. Essential for buying clothes internationally, tailoring, understanding size charts from different regions.
🏃 Sports & Fitness
Convert running distances, swimming pools, athletic tracks. Olympic pool 50 meters. Track 400 meters = 0.25 miles. 5K = 3.1 miles, 10K = 6.2 miles. Understanding distance conversions essential for training, races, comparing performances, and fitness tracking across different measurement systems.
📚 Education & Science
Convert lengths for math, physics, chemistry homework. Scientific measurements in meters, cm, mm. Students need conversions between metric and imperial. Understanding wavelengths (nm), atomic distances (angstrom), astronomical distances (light years). Essential for STEM education, lab work, research.