Hectares to Acres - Metric Tables

horsepower to joules
If you can't find the units you need read the message about similar types below.
You might be asking the impossible by converting into the wrong units.
For metric conversions go to a unit starting with -
a b c d e f g h i j k l m n o p q r s t u v w y

These units multiplied by ...... ..this factor will... ..convert to these units.
hand 10.16 cm
hectares (10000 sq.m) 2.471 acres
hectares 107600 sq. feet
hectograms 100 grams
hectolitres 100 litres
hectometres 100 metres
hectowatts 100 watts
henries 1000 millihenries
hogsheads (British) 10.114 cubic feet
hogsheads (U.S.) 8.42184 cubic feet
hogsheads (U.S.) 63 gallons (U.S.)
horsepower 42.44 Btu/min
horsepower 33000 foot-lbs/min
horsepower 550 foot-lbs/sec
horsepower (metric) 0.9863 horsepower
horsepower 10.68 kg-calories/min
horsepower 0.7457 kilowatts
horsepower (boiler) 33479 Btu/hr
horsepower (boiler) 9809.5 watts
horsepower (metric) 735.4988 watts
horsepower (electric) 746 watts
horsepower see tables cc and cu.in. (approx)
horsepower (UK) 745.7 watts
horsepower (water) 746.043 watts
horsepower-hrs 2547 Btu
horsepower-hrs 2.68E+13 ergs
horsepower-hrs 1980000 foot-lbs
horsepower-hrs 641190 gram-calories
horsepower-hrs 2684000 joules
horsepower-hrs 641.1 kg-calories
horsepower-hrs 273700 kg-metres
horsepower-hrs 0.7457 kilowatt-hrs
hours (mean solar) 0.04166667 days (more on time)
hours (mean solar) 0.005952381 weeks
hundredweights (cwt) (long) 112 pounds (lbs)
hundredweights (long) 0.05 tons (long)
hundredweights (short) 1600 ounces (avoirdupois)
hundredweights (short) 100 pounds (lbs)
hundredweights (short) 0.0453592 tonnes (metric)
hundredweights (short) 0.0446429 tons (long)
imperial measurements see page time, money, units, etc.
inches, in, ins. and fractions convert here metres, cm, mm
inches 2.54 centimetres
inches 0.08333333 feet
inches 0.0254 metres
inches 0.00001578 miles
inches 25.4 millimetres
inches 1000 mils
inches 0.027777778 yards
inches of mercury (at 32deg.F) 3386.389 pascal
inches of mercury 0.03342 atmospheres
inches of mercury 1.133 feet of water
inches of mercury 0.03453 kgs/sq. cm
inches of mercury 345.3 kgs/sq. metre
inches of mercury 70.73 pounds/sq. ft.
inches of mercury 0.4912 pounds/sq. in.
inches of water (at 4ºC) 0.002458 atmospheres
inches of water (at 4ºC) 0.07355 inches of mercury
inches of water (at 4ºC) 0.00254 kgs/sq. cm
inches of water (at 4ºC) 0.5781 ounces/sq. in
inches of water (at 4ºC) 5.204 pounds/sq. ft
inches of water (at 4ºC) 0.03613 pounds/sq. in
international ampere 0.9998 ampere (absolute)
international volt 1.59E-19 joules (absolute)
international volt 96540 joules
iron (shoes) 5.30E-04 metre
joules 9.48E-04 Btu
joules 10000000 ergs
joules 0.7376 foot-pounds
joules 0.0002389 kg-calories
joules 0.102 kg-metres
joules 0.0002778 watt-hrs
joules/cm 10200 grams
joules/cm 10000000 dynes
joules/cm 100 joules/metre (newton)
joules 723.3 poundals
joules 22.48 pounds
These units multiplied by ...... ..this factor will... ..convert to these units.
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Related pages
" Home page
" Info on SI Units
" SI Unit Descriptions
" SI Derived Units
" SI Prefixes (mega, giga)
" Imperial/UK Units
" Scientific Notation
--(i.e. what is 1.00E+09)

Detail pages
" Feet to metres calculator
" Metres to feet calculator
British Thermal Units Btu
" Density of bulk materials
" Density of liquids
" Specific Gravity of water
" Density of metals
" Density of woods
" Kitchen metric
" Medical metric
" Parts per million - ppm
" Clothing metric
" Yarn metric
" Time
" cc to hp
" Paper & Envelopes
" Gross to Nett price
" Nett to Gross price
" Add on Commission
" Sheet metal swg - mm
" Wire & rod swg - awg
" Electrical wire swg - awg
" Steam tables (4 pages)
" Watts, amps, volts, ohms
" M Threads & spanners
" Self tapping screws
" M tap & pilot drill sizes
Other useful sections


We have tried to be accurate with the above table but cannot be held responsible for inaccuracies.
Go back to first principals and double check your calculations if the result is 'mission critical'.

The scientific notation used in the factors column helps to reduce long numbers to a manageable width. E+01 means moving the decimal point one space to the right so 1.00E+01 is shorthand for 10, then 1.33E+00 stays at 1.33 and 1.33E-01 becomes 0.133. The format tends to be used when the figure gets longer so E+09 or E-09 cuts out a lot of noughts.

Task: How many sq.rods in 10 acres.
From the tables: 1 acre = 160 sq.rods, so
10 acres x 160 = 1600 sq.rods
When you want to reverse the conversion,
divide by the factor viz.
1600 sq.rods/160 = 10 acres

Impossible Conversions
Remember that you cannot create energy only convert it. Likewise, you will not find a conversion from pounds to metres - the basic units must remain the same - mass converted to mass, length converted to length, et al.

You won't usually find a conversion from kilograms to grams - the prefix 'kilo' means '1,000' so a kilogram is in fact 1,000 grams in the same way as a kilometer is 1,000 metres [or about 1,000 yards in 'old money']. I have put a few in the table because visitors have asked for them. More examples can be found on the prefix table.

One handy metric link between units to remember is that 1 Litre [1000cc] of pure water weighs 1 kilogram.

If accuracy is critical beware of old versions of MS Excel which had problems rounding off numbers.

Metrication is a great help but has also created anomalies; I have seen pressure gauges changed from a commonly used psi to kg/cm.sq., bar, pascal, kPa and atmos but will no doubt move to a popular metric standard in a few decades.

More information on the SI System (Le Système International d'Unités) base units and definitions.


last modified: 6th. September 2011

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