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hectare
Symbol:  ha 
Category:  Area 
SI Equivalent:  1×104 m2
Dimension:  L2 
System:  French 
 
Notes
French metric unit of area used in surveyor's measurements.
Convert     ha  
1 ha =
Area
  Symbol Unit Name
2.47105  ac, acre  acre 
100  a  are 
10×1031  b  barn 
2.55618×104  bbl (US, liq.)/ft  barrel (US, liq.) per foot 
2130.15  bbl (US, liq.)/in  barrel (US, liq.) per inch 
1.91713×104  bbl (US, petrol)/ft  barrel (US, petrol) per foot 
1597.61  bbl (US, petrol)/in  barrel (US, petrol) per inch 
1×104    centare 
1.97353×107  cin  circular inch 
1.97353×1013  cmil  circular mil 
1.21295    morgen (Dutch) 
3.94907    morgen (Prussian) 
1.1675    morgen (South Africa) 
1.54441×10-2    quarter section 
9.88422    rood (UK) 
3.86102×10-3  sq.mi, mi2 (stat.)  section (square statute mile) 
1×1056    shed 
1×108  cm2  square centimeter 
10.7639  sq. ch. (engineer's)  square chain (engineer's) 
24.7105  sq. ch. (Gunter's)  square chain (Gunter's) 
100  dam2  square decameter 
1×106  dm2  square decimeter 
1×10-32  Em2  square exameter 
10×1033  fm2  square femtometer 
10×1033  f2  square fermi 
1.07639×105  ft2  square foot 
1×10-14  Gm2  square gigameter 
1  hm2  square hectometer 
1.55×107  in2, sq. in  square inch 
1×10-2  km2  square kilometer 
1×10-8  Mm2  square megameter 
1×104  m2  square meter 
1×1016  µm2  square micrometer 
1.55×1013  mil2  square mil (thou) 
1.81554×10-4  sq. mi. (geogr.)  square mile (geographical) 
2.91553×10-3  sq. mi. (int. naut.)  square mile (int. naut.) 
3.86101×10-3  sq. mi. (int.)  square mile (int.) 
1×1010  mm2  square millimeter 
10×1021  nm2  square nanometer 
395.366  rd2  square perch 
10×10-27  Pm2  square petameter 
10×1027  pm2  square picometer 
395.366  rd2  square pole 
395.366  rd2  square rod 
10×10-21  Tm2  square terameter 
1.19599×104  yd2, sq. yd  square yard 
1×1052  ym2  square yoctometer 
2.93874×10-35  Ym2  square yottameter 
9.99473×1045  zm2  square zeptometer 
2.93874×10-35  Zm2  square zettameter 
1.07251×10-4    township (US) 
5.55987    vergee (Jersey) 
6.48652    vergees (Guernsey) 
Fuel Consumption
  Symbol Unit Name
4.25144×109  gal/mile  gallon per mile 
1×1012  l/100 km  liter per 100 kilometers 
1×1010  l/km  liter per kilometer 
Hydrodynamic permeability
  Symbol Unit Name
1.01325×1016    darcy 
Glossary
FREE Publications
CNC Machining Design Guide

Optimize your designs, reduce machining time, and lower your costs.

Mechanical Engineers Outlook

Guide for those interested in becoming a mechanical engineer. Includes qualifications, pay, and job duties.

Negotiate Your Salary

Learn the best principles to negotiate the salary you deserve!

Injection Molding Design Guide

Guide for high quality and cost-effective plastic injection molding.

more publications