Australian Government - Department of Innovation, Industry, Science and Research: National Measurement Institute

Metric conversion tables 

(Last published: 17 Dec 2009)

Our tables and ready reckoner will help you to calculate your own metric conversions.

The tables contain a list of conversion factors for area, length, mass, power, temperature, pressure, velocity, volume and energy, whilst our ready reckoner converts measurements for area | length | mass | power | temperature | pressure | velocity | volume and energy.

Click here for information on SI units, their symbols, SI prefixes and Australian legal units of measurement.

Common usage in Australia (AS/NZS 1376:1996 Conversion Factors, p31) is that:

  • million = 106
  • billion = 109
  • trillion = 1012
  • quadrillion = 1015

If you require further help call +61 2 8467 3871 or +61 2 1800 251 942.

Every effort has been made to ensure the accuracy of the material contained in these tables and in the ready reckoner measurement converters. The information on this site is made available on the understanding that the Commonwealth of Australia is not engaged in rendering professional advice. Users should verify, independently, the accuracy, currency, completeness and relevance of the material on this site, or the information contained in it. In particular, users should seek independent professional advice before making any investment or business decisions. Changes in circumstances after a document has been placed on the Internet may impact on the accuracy or currency of the information. For particular queries, or to assist in ascertaining currency of information, please contact the National Measurement Institute.

Users may also wish to refer to other websites for independent verification of the information provided here, and this link is provided for this reason: http://physics.nist.gov/cuu/Reference/unitconversions.html

Note: In the ready reckoner measurement converters below, ^ indicates that the following number is a superscript.

Area conversion

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Length conversion

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Mass conversion

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Power conversion

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Pressure conversion

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Temperature conversion

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Velocity and speed conversion

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Volume conversion

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Energy conversion

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List of conversion factors

Area

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From To Multiply by
acres (ac) hectares (ha) 0.4047
acres (ac) square metres (m2) 4047
hectares (ha) square metres (m2) 10000
hectares (ha) acres (ac) 2.471
perches (p) square metres (m2) 25.2929
roods (rd) square metres (m2) 1011.7
squares square metres (m2) 9.2903
square centimetres (cm2) square inches (in2) 0.155
square feet (ft2) square metres (m2) 0.0929
square inches (in2) square metres (m2) 0.00064516
square inches (in2) square millimetres (mm2) 645.16
square inches (in2) square centimetres (cm2) 6.4516
square metres (m2) square yards (yd2) 1.196
square metres (m2) square feet (ft2) 10.76
square metres (m2) square inches (in2) 1550
square metres (m2) acres (ac) 0.000247
square metres (m2) roods (rd) 0.000988
square metres (m2) perches (p) 0.0395
square metres (m2) hectares (ha) 0.0001
square metres (m2) squares 0.1076
square millimetres (mm2) square inches (in2) 0.00155
square yards (yd2) square metres (m2) 0.8361

Length

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From To Multiply by
centimetres (cm) inches (in) 0.3937
chains (ch) metres (m) 20.117
feet (ft) metres (m) 0.3048
inches (in) metres (m) 0.0254
inches (in) centimetres (cm) 2.54
inches (in) millimetres (mm) 25.4
international nautical miles (n mile) metres (m) 1852
light years (l.y.) metres (m) 9.4605 x 1015
links (lk) metres (m) 0.2012
metres (m) miles 0.00062137
metres (m) chains (ch) 0.0497
metres (m) yards (yd) 1.0936
metres (m) links (lk) 4.9709
metres (m) feet (ft) 3.2808
metres (m) inches (in) 39.37
metres (m) international nautical miles (n mile) 0.000539
metres (m) light years (l.y.) 1.057 x 10-16
metres (m) perches (p) 0.1988
miles metres (m) 1609.3
millimetres (mm) inches (in) 0.03937
perches (p) metres (m) 5.0292
yards (yd) metres (m) 0.9144

Mass

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From To Multiply by
drams (dr) kilograms (kg) 0.0017718
grains (gr) kilograms (kg) 0.000064798
hundredweights (cwt) kilograms (kg) 50.8023
kilograms (kg) tons 0.000984
kilograms (kg) tonnes (t) 0.001
kilograms (kg) short tons (sh tn) 0.0011023
kilograms (kg) hundredweights (cwt) 0.197
kilograms (kg) quarters (qr) 0.078736
kilograms (kg) stones (st) 0.1575
kilograms (kg) pounds (lb) 2.2046
kilograms (kg) ounces (oz) 35.274
kilograms (kg) drams (dr) 564.3
kilograms (kg) grains (gr) 15432
kilograms (kg) slugs 0.0685
kilograms (kg) troy ounces (oz tr) 32.1507
kilograms (kg) pennyweight (dwt) 643.01
ounces (oz) kilograms (kg) 0.02835
pennyweight (dwt) kilograms (kg) 0.0015552
pounds (lb) kilograms (kg) 0.4536
quarters (qr) kilograms (kg) 12.7006
short tons (sh tn) kilograms (kg) 907.18
short tons (sh tn) tonnes (t) 0.9072
slugs kilograms (kg) 14.5939
stones (st) kilograms (kg) 6.3502
tons kilograms (kg) 1016
tons tonnes (t) 1.016
tonnes (t) kilograms (kg) 1000
tonnes (t) tons 0.984
tonnes (t) short tons (sh tn) 1.1023
troy ounces (oz tr) kilograms (kg) 0.0311

Power

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From To Multiply by
horsepower (hp) Watts (W) 745.7
Watts (W) horsepower (hp) 0.001341

Pressure

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From To Multiply by
millibars (mb) pascals (Pa) 100
millibars (mb) standard atmospheres (atm) 0.00098692
millimetres of mercury (mm Hg) pascals (Pa) 133.32
pascals (Pa) millimetres of mercury (mm Hg) 0.0075
pascals (Pa) millibars (mb) 0.01
pascals (Pa) standard atmospheres (atm) 0.0000098692
standard atmospheres (atm) pascals (Pa) 101325
standard atmospheres (atm) millibars (mb) 1013
pounds-force per square inch (lbf/in2) kilopascals (kPa) 6.8947573
kilopascals (kPa) pounds-force per square inch (lbf/in2) 0.14503774

Temperature

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From To Multiply by
Celsius (degrees C) Fahrenheit (degrees F) 9/5 x C + 32
Celsius (degrees C) Kelvin (K) C + 273.15
Fahrenheit (degrees F) Celsius (degrees C) 5/9 x (F - 32)
Fahrenheit (degrees F) Kelvin (K) 5/9 x (F + 459.67)
Kelvin (K) Celsius (degrees C) K - 273.15
Kelvin (K) Fahrenheit (degrees F) 9/5 x K - 459.67

Velocity and Speed

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From To Multiply by
feet per minute (ft/min) metres per second (m/s) 0.00508
kilometres per hour (km/h) miles per hour (mile/h) 0.6214
knotts, international metres per second (m/s) 0.51444
metres per second (m/s) knotts, international 1.9438
metres per second (m/s) miles per hour (mile/h) 2.2369
metres per second (m/s) feet per minute (ft/min) 196.8
miles per hour (mile/h) metres per second (m/s) 0.447
miles per hour (mile/h) kilometres per hour (km/h) 1.6093

Volume

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From To Multiply by
cubic centimetres (cm3) cubic inches (in3) 0.06102
cubic feet (ft3) cubic metres (m3) 0.0283
cubic feet (ft3) litres (L) 28.317
cubic inches (in3) cubic millimetres (mm3) 16387
cubic inches (in3) cubic centimetres (cm3) 16.387
cubic inches (in3) cubic metres (m3) 0.000016387
cubic metres (m3) cubic yards (yd3) 1.3079
cubic metres (m3) cubic feet (ft3) 35.315
cubic metres (m3) cubic inches (in3) 61024
cubic metres (m3) US gallons (US gal) 264.172
cubic metres (m3) gallons (gal) 219.9
cubic metres (m3) litres (L) 1000
cubic metres (m3) quarts (qt) 879.88
cubic metres (m3) pints (pt) 1759
cubic metres (m3) gills 7039
cubic metres (m3) fluid ounces (fl oz) 35195
cubic metres (m3) fluid drachm (fl dr) 281560.6
cubic metres (m3) minims (min) 16893604
cubic millimetres (mm3) cubic inches (in3) 0.00006102
cubic yards (yd3) cubic metres (m3) 0.7646
fluid ounces (fl oz) cubic metres (m3) 0.000028413
fluid ounces (fl oz) millilitres (mL) 28.4131
fluid drachm (fl dr) cubic metres (m3) 0.0000035516
gallons (gal) cubic metres (m3) 0.0045461
gallons (gal) litres (L) 4.54609
gills cubic metres (m3) 0.00014206
litres (L) cubic metres (m3) 0.001
litres (L) cubic feet (ft3) 0.0353
litres (L) gallons (gal) 0.22
litres (L) US gallons (US gal) 0.2642
litres (L) minims (min) 16894
millilitres (mL) fluid ounces (fl oz) 0.035195
minims (min) cubic metres (m3) 0.000000059194
minims (min) litres (L) 0.000059194
pints (pt) cubic metres (m3) 0.00056826
quarts (qt) cubic metres (m3) 0.0011365
US gallons (US gal) cubic metres (m3) 0.0037854
US gallons (US gal) litres (L) 3.7854

Energy

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From To Multiply by
British thermal units (Btu) joules (J) 1055.1
calories (cal) joules (J) 4.1868
joules (J) kilocalories (kcal) 0.00023884
joules (J) calories (cal) 0.23884
joules (J) British thermal units (Btu) 0.0009478
joules (J) kilowatt hours (kW.h) 0.00000027778
kilocalories (kcal) joules (J) 4186.8
kilowatt hours (kW.h) joules (J) 3600000