TechTools

Area Converter

From
To
Sig. figures:

Square Millimeter

mm²

1.00000e+6

Square Centimeter

cm²

10000

Square Decimeter

dm²

100

Square Meter

m²

1(input)

Are

a

0.01

Hectare

ha

0.0001

Square Kilometer

km²

1.000000e-6

Square Inch

in²

1550

Square Foot

ft²

10.7639

Square Yard

yd²

1.19599

Square Rod / Perch

sq rd

0.0395369

Square Chain

sq ch

0.00247105

Rood

rood

0.000988422

Acre

ac

0.000247105

Square Mile

mi²

3.861022e-7

Tarang Wa / Sq Wa (TH)

ตร.ว

0.25

Tatami / Jo (JP)

畳

0.617284

Tsubo / Pyeong (JP/KR)

坪/평

0.3025

Ngan (TH)

งาน

0.0025

Se (JP)

畝

0.0100833

Rai (TH)

ไร่

0.000625

Tan / Dan (JP)

反

0.00100833

Mu / Mou (CN)

亩

0.0015

Chō (JP)

町

0.000100833

Qing (CN)

顷

1.500000e-5

Marla (IN/PK)

marla

0.0395369

Cent / Decimal (IN)

cent

0.0247105

Guntha (IN)

guntha

0.00988422

Kanal (IN/PK)

kanal

0.00197684

Bigha / Pucca (IN)

bigha

0.000395369

Dunam (TR/IL/ME)

dunam

0.001

Feddan (EG/SD)

feddan

0.000238095

Morgen (ZA)

morgen

0.00011675

Barn

b

1.000000e+28

Millibarn

mb

1.000000e+31

Picobarn

pb

1.000000e+40

Femtobarn

fb

1.000000e+43

Hover any row to copy the value or use it as the new input.

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A comprehensive area converter that shows conversions across all unit systems simultaneously. Supports 37 units spanning Metric (square millimeter to square kilometer, including are and hectare), Imperial/US (square inch, square foot, square yard, square rod, square chain, rood, acre, square mile), East Asian (Thai tarang wa/ngan/rai, Japanese tatami/tsubo/se/tan/chō, Chinese mu/qing, Korean pyeong), South Asian & Global Land (Indian marla, cent, guntha, kanal, bigha; Middle Eastern dunam and feddan; South African morgen), and Scientific (barn, millibarn, picobarn, femtobarn for nuclear physics). Type a value, pick a unit, and instantly see every other unit's equivalent. Click any result row to use that value as the new input for reverse conversions. Adjust significant figures (3–12) and toggle scientific notation for very large or tiny values. Includes a collapsible quick-reference table of the most common conversions. 100% browser-based - no data leaves your device.

How to Use

  1. 1Type a number in the input field at the top
  2. 2Select your starting unit from the From dropdown (e.g. Square Meter, Acre, Hectare)
  3. 3Select your target unit from the To dropdown - the result appears instantly
  4. 4All conversions appear simultaneously, grouped by system: Metric, Imperial/US, East Asian, South Asian & Global, and Scientific
  5. 5Hover any result row to reveal the copy and swap buttons
  6. 6Click the copy icon to copy a value to your clipboard
  7. 7Click the swap icon (⇅) on any row to use that unit as the new input and reverse the conversion
  8. 8Adjust 'Sig. figures' to control result precision (3 to 12 significant digits)
  9. 9Toggle 'Sci notation' to display very large or very small values (like barns) in exponential form
  10. 10Collapse a unit group by clicking its header to reduce clutter
  11. 11Open 'Common conversions' at the bottom for a quick reference table

Features

  • 37 area units across 5 unit systems
  • Metric: square millimeter, centimeter, decimeter, meter, are, hectare, square kilometer
  • Imperial/US: square inch, foot, yard, square rod, square chain, rood, acre, square mile
  • East Asian: Thai tarang wa, ngan, rai; Japanese tatami, tsubo, se, tan, chō; Chinese mu, qing; Korean pyeong
  • South Asian & Global: Indian marla, cent, guntha, kanal, bigha; dunam (Turkey/Israel/ME); feddan (Egypt); morgen (South Africa)
  • Scientific: barn, millibarn, picobarn, femtobarn - nuclear cross-section units used in particle physics
  • All conversions shown simultaneously - no need to pick a single 'to' unit
  • Click any result row to use it as the new input (instant reverse conversion)
  • Adjustable significant figures: 3, 4, 5, 6, 8, 10, or 12 digits
  • Toggleable scientific notation for very large and very small values
  • Collapsible unit-system groups to reduce visual clutter
  • One-click copy to clipboard for any converted value
  • Common conversions quick-reference table (metric ↔ imperial ↔ Asian ↔ land units)
  • 100% browser-based - no server, no data upload

Frequently Asked Questions

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