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Convert From> Convert To \/ 
Square Centimeter (sq cm) 
Square Inch (sq in) 
Square Foot (sq ft) 
Square Yard (sq yd) 
Square Meter (sq m) 
Square Rod (sq rd) 
Acre  Square Kilometer (sq km) 
Square Mile (sq mi) 
Square Centimeter (sq cm) 
6.4516  929.0304  8,361.2736  10,000  252,928.5264  4.047e7  1.0e10  2.5899881 e10 

Square Inch (sq in) 
1.55e1  144  1,296  1,550  39,204  6.27264 e6 
1.550e9  4.0144896 e9 

Square Foot (sq ft) 
1.07639 e3 
6.9444 e3 
9  10.7639104  272.25  43,560  10,763,914.2  27,878,400  
Square Yard (sq yd) 
1.19599 e4 
7.71605 e4 
1.11111 e1 
1.19599  30.25  4,840  1,195,990  9,292,800  
Square Meter (sq m) 
1.0e4  6.4516 e4 
0.0929  0.836  25.29285264  4,047  1,000,000  2,589,988.1  
Square Rod (sq rd) 
3.95369 e6 
2.55076 e5 
3.67309 e3 
3.30579 e2 
3.95369 e2 
160  39,536.861  102,400  
Acre  2.47097 e8 
1.59423 e7 
2.29568 e5 
2.06612 e4 
2.47097 e4 
6.25e3  247.09661  640  
Square Kilometer (sq km) 
1.0e10  6.45161 e10 
7.74192 e9 
2.32258 e8 
1.0e6  2.52929e5  4.047 e3 
2.5899881  
Square Mile (sq mi) 
3.86102 e9 
2.49098 e10 
3.58443 e8 
1.07610 e7 
3.86102 e7 
9.76563e6  1.5625 e3 
3.86102e1 
For example, if you know that an area of land is 8 acres in size and you want to convert that value into square feet, look down the "acre" column until you find "square foot" row, where you will find the value 43,560. Multiply 8 by 43,560 and you will find that 8 acres contain 348,380 square feet. Conversions between English and Metric values are performed in the same way.
In the table, English to English conversions are shown in Orange. Metric to Metric conversions are shown in Green. Conversions between English and Metric systems are shown in White.
Notes:
All metric measurement units are directly convertible between one another by dividing or multiplying by the values shown below.
Square Centimeter (cm² or sq cm) 
Square Meter or Centare (m² or sq m or ca) 
Are (a) 
Hectare (ha) 
Square Kilometer (km² or sq km) 
0.0001 (1.0e4) 
1 (1.0e0) 
100 (1.0e2) 
10,000 (1.0e4) 
1,000,000 (1.0e6) 
For example, if an area is known to be 17.0 Square Kilometers in size, it is also 1,700 Hectares and 17,000,000 Square Meters in size. Similarly, an area that is 340,000 Square Meters in size is also 34 Hectares or 0.340 Square Kilometers in size.
Length and Distance Measurement Conversion Reference (HTML)
U.S. Capacity Measurement Conversions (HTML)
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