Free unit conversionAs of 2026

Area · Shoes · Length · Weight · Temperature · Speed · Width · PressureUnit conversion calculator

Use 8 different unit conversions at once, ranging from a square footage calculator to shoe sizes, length, weight, temperature, and pressure.

Instant conversion8 types of calculatorsAs of 2026Completely free
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Go to Unit Conversion Calculator

Instantly calculate frequently used unit conversions.

Apartment Size Calculator

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Mutual conversion between m² and pyeong, calculation of gross and net area

Supply area

Shoe size conversion

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US·Europe·China·Japan·UK Shoe Size Conversion

USAeuropeUKchinajapan

Length conversion

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km·m·cm·mm·inch·foot·yard·mile conversion

kmminchfeet

Weight conversion

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Weight conversion in kg, g, lb, oz, ton, carat, and geun units

kglbpoundoz.

Temperature conversion

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Instant Celsius, Fahrenheit, Kelvin, and Rankine temperature conversion

CelsiusFahrenheitKelvin

Speed conversion

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km/h·m/s·mph·knot·Mach speed conversion

km/hm/smph

Area transformation

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Area conversion m² · pyeong · hectare · acre · km²

hectare

Pressure conversion

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Pa·kPa·bar·atm·psi·mmHg Pressure conversion

PabarATMpsi
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Guide to Using the Unit Conversion Calculator

Instantly calculates unit conversions frequently needed in daily life, travel, and studies.

Frequently Used Conversion Formulas

1 pyeong = 3.3058 m² · 1 m² = 0.3025 pyeong
1 inch = 2.54 cm · 1 foot = 30.48 cm · 1 mile = 1.609 km
1 pound (lb) = 0.4536 kg · 1 ounce (oz) = 28.35 g
Celsius (°C) = (Fahrenheit – 32) × 5/9
Shoe size conversions may vary by 0.5 to 1 size depending on the brand and manufacturer. We recommend taking actual measurements before purchasing.

Frequently Asked Questions

How much is a 33-pyeong apartment in m²?
33 pyeong × 3.3058 = approximately 109.1 m². The supply area (sale area) includes common areas and differs from the exclusive area.
How many millimeters is a US shoe size 9 in Korean millimeters?
US men's 9 is approximately 270mm (27cm), and women's 9 is approximately 260mm (26cm). There may be differences depending on the brand.
What is 72 degrees Fahrenheit in Celsius?
(72 – 32) × 5/9 = 22.2℃. A US weather forecast of 72℉ is pleasant weather.

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