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Unit Converter

1Meter = 100Centimeter
100

International System (SI)

Picometer (pm)1.00×10¹²
Nanometer (nm)1.00×10⁹
Micrometer (μm)1000000
Millimeter (mm)1000
Centimeter (cm)100
Decimeter (dm)10
Meter (m)1
Kilometer (km)0.001
Astronomical Unit (AU)6.68×10⁻¹²
Light Year (ly)1.06×10⁻¹⁶

Imperial

Mil (mil)39370.07874
Inch (in)39.370079
Foot (ft)3.28084
Yard (yd)1.093613
Mile (mi)0.000621
Nautical Mile (nmi)0.00054
Fathom (fm)0.546807
Furlong (fur)0.004971

Chinese Market

Li0.002
Zhang0.3
Chi3
Cun30
Fen300
Hao3000

Free online unit converter supporting 34 categories: length, weight, temperature, area, volume, speed, time, pressure, energy, power, data storage, angle, frequency, and more. Covers metric, imperial, and traditional Chinese units. Includes popular conversion tables and formulas for cm to inches, kg to lbs, Celsius to Fahrenheit, km to miles, and more. Instant results for study, work, engineering, and daily use.

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Use Cases

  • Convert inches, pounds, and Fahrenheit to cm, kg, and Celsius when shopping internationally
  • Convert engineering units like psi to MPa, horsepower to kW, and torque values
  • Convert square feet to square meters for real estate or renovation planning
  • Convert ounces, gallons, and pounds to grams, liters, and kg for cooking and baking
  • Complete physics homework problems involving length, mass, temperature, and velocity unit conversions
  • Convert running pace from mph to km/h and body weight from lbs to kg for fitness tracking

Features

  • 34 unit categories: length, weight, temperature, area, volume, speed, time, pressure, energy, power, data storage, and more
  • Metric, Imperial & Chinese units: Supports SI units, US/UK units, and traditional Chinese units (li, chi, cun, jin, liang, mu)
  • Accurate temperature conversion: Nonlinear Celsius/Fahrenheit/Kelvin conversion with offset handling
  • Instant batch results: Enter one value and see all units in the category simultaneously
  • Quick reference tables and formulas: Built-in popular conversion tables for cm→in, kg→lb, km→mi, °C→°F and more
  • No installation needed: Works directly in the browser for all common unit conversions

How to Use

  1. Select the unit category tab (length, weight, temperature, area, etc.)
  2. Enter a value in the left input box and select the source unit from the dropdown
  3. Select the target unit from the right dropdown to see the conversion instantly
  4. Expand 'Show all conversions' to view results for all units in the category
  5. Refer to the quick conversion tables and formulas below for fast reference

FAQ

How many cm in an inch?

1 inch equals exactly 2.54 centimeters (cm). This is the international standard, so 1 in = 2.54 cm. Conversely, 1 centimeter equals approximately 0.3937 inches.

How many pounds in a kilogram? How many kg in a pound?

1 kilogram (kg) equals approximately 2.2046 pounds (lb). 1 pound equals approximately 0.4536 kilograms.

How do you convert Celsius to Fahrenheit?

Celsius to Fahrenheit formula: °F = °C × 9/5 + 32. Fahrenheit to Celsius formula: °C = (°F − 32) × 5/9. For example: 0°C = 32°F, 100°C = 212°F, 37°C (body temperature) ≈ 98.6°F.

How many km in a mile? How many miles in a km?

1 mile equals approximately 1.6093 kilometers (km). 1 kilometer equals approximately 0.6214 miles. For example: 100 km ≈ 62 miles, 100 miles ≈ 161 km.

How many square feet in a square meter?

1 square meter (m²) equals approximately 10.7639 square feet (sq ft). 1 square foot equals approximately 0.0929 square meters.

How many liters in a gallon?

1 US gallon equals approximately 3.785 liters. 1 UK (imperial) gallon equals approximately 4.546 liters. 1 liter equals approximately 0.2642 US gallons or 0.22 UK gallons.

Why is temperature conversion not simple multiplication?

Temperature scales have different zero points: 0°C = 32°F, not 0°F. The relationship is linear (not proportional), so you need to add/subtract an offset before multiplying/dividing by the conversion factor.

How many ounces in a gram?

1 gram equals approximately 0.0353 ounces (oz). 1 ounce equals approximately 28.35 grams. 1 pound equals 16 ounces, which is approximately 453.6 grams.

About Unit Conversion

Unit conversion is the process of converting the measurement of a physical quantity from one unit of measurement to another. There are three major unit systems used worldwide: the International System of Units (SI, also known as the metric system), the Imperial/US Customary system, and various traditional units. The metric system uses meters, kilograms, and seconds as base units and is the official standard in most countries. Imperial units (feet, pounds, Fahrenheit) are primarily used in the United States and partially in the UK. Chinese traditional units include li, zhang, chi, cun (length), jin, liang (mass), and mu (area), which remain common in daily life.

Length conversions are based on the meter (m): 1 kilometer = 1000 meters, 1 centimeter = 0.01 meters, 1 inch = 0.0254 meters (2.54 cm), 1 foot = 0.3048 meters, 1 mile = 1609.344 meters. Mass conversions are based on the kilogram (kg): 1 gram = 0.001 kg, 1 pound ≈ 0.4536 kg, 1 ounce ≈ 28.35 g.

Temperature conversion differs from proportional length/mass conversions because scales have different zero points: Celsius sets water's freezing point at 0°C and boiling point at 100°C; Fahrenheit uses 32°F (freezing) and 212°F (boiling); Kelvin starts at absolute zero (0 K = -273.15°C). Conversions require both offset and scaling.

Area conversions are based on the square meter: 1 km² = 1,000,000 m², 1 hectare = 10,000 m², 1 square foot ≈ 0.0929 m², 1 acre ≈ 4046.86 m². For volume: 1 cubic meter = 1000 liters, 1 liter = 1000 milliliters, 1 US gallon ≈ 3.785 liters, 1 UK gallon ≈ 4.546 liters.

Data storage uses binary prefixes: 1 KB = 1024 B, 1 MB = 1024 KB, 1 GB = 1024 MB, 1 TB = 1024 GB. Note that hard drive manufacturers often use decimal prefixes (1 GB = 1000 MB) for labeling, while operating systems use binary, causing reported capacity to be slightly less than advertised.

Centimeters to Inches Conversion Table

Centimeters (cm)Inches (in)
1 cm0.39 in
5 cm1.97 in
10 cm3.94 in
50 cm19.69 in
100 cm39.37 in
150 cm59.06 in
200 cm78.74 in

Inches to Centimeters Conversion Table

Inches (in)Centimeters (cm)
1 in2.54 cm
5 in12.70 cm
10 in25.40 cm
12 in (1 ft)30.48 cm
24 in (2 ft)60.96 cm
36 in (3 ft)91.44 cm
60 in (5 ft)152.40 cm

Meters to Feet Conversion Table

Meters (m)Feet (ft)
1 m3.28 ft
5 m16.40 ft
10 m32.81 ft
50 m164.04 ft
100 m328.08 ft
500 m1,640.42 ft
1000 m3,280.84 ft

Kilometers to Miles Conversion Table

Kilometers (km)Miles (mi)
1 km0.62 mi
5 km3.11 mi
10 km6.21 mi
50 km31.07 mi
100 km62.14 mi
500 km310.69 mi
1000 km621.37 mi

Kilograms to Pounds Conversion Table

Kilograms (kg)Pounds (lb)
1 kg2.20 lb
5 kg11.02 lb
10 kg22.05 lb
25 kg55.12 lb
50 kg110.23 lb
75 kg165.35 lb
100 kg220.46 lb

Grams to Ounces Conversion Table

Grams (g)Ounces (oz)
1 g0.035 oz
5 g0.176 oz
10 g0.353 oz
50 g1.764 oz
100 g3.527 oz
250 g8.818 oz
500 g17.637 oz

Celsius to Fahrenheit Conversion Table

Celsius (°C)Fahrenheit (°F)
0 °C32 °F
10 °C50 °F
20 °C68 °F
25 °C77 °F
30 °C86 °F
37 °C98.6 °F
100 °C212 °F

Square Meters to Square Feet Conversion Table

Square Meters (m²)Square Feet (sq ft)
1 m²10.76 sq ft
10 m²107.64 sq ft
50 m²538.20 sq ft
100 m²1,076.39 sq ft
500 m²5,381.96 sq ft
1000 m²10,763.91 sq ft
10000 m²107,639.10 sq ft

Liters to US Gallons Conversion Table

Liters (L)US Gallons (US gal)
1 L0.26 US gal
5 L1.32 US gal
10 L2.64 US gal
20 L5.28 US gal
50 L13.21 US gal
100 L26.42 US gal
1000 L264.17 US gal

Kilometers per Hour to Miles per Hour Conversion Table

km/hmph
10 km/h6.21 mph
20 km/h12.43 mph
40 km/h24.85 mph
60 km/h37.28 mph
80 km/h49.71 mph
100 km/h62.14 mph
120 km/h74.56 mph