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Injection Molding Design Guide

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

Essentials of Manufacturing

Information, coverage of important developments and expert commentary in manufacturing.

Mechanical Engineers Outlook

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

CNC Machining Design Guide

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

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Math
 
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
Injection Molding Design Guide

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

Essentials of Manufacturing

Information, coverage of important developments and expert commentary in manufacturing.

Mechanical Engineers Outlook

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

CNC Machining Design Guide

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

more publications